diff --git a/package.json b/package.json
index a4ad1dd7e5e81..696e5aa63a5d5 100644
--- a/package.json
+++ b/package.json
@@ -1523,7 +1523,7 @@
     "@types/source-map-support": "^0.5.3",
     "@types/stats-lite": "^2.2.0",
     "@types/styled-components": "^5.1.0",
-    "@types/supertest": "^2.0.12",
+    "@types/supertest": "^6.0.2",
     "@types/tapable": "^1.0.6",
     "@types/tar": "^6.1.11",
     "@types/testing-library__jest-dom": "^5.14.7",
@@ -1697,8 +1697,8 @@
     "style-loader": "^1.1.3",
     "stylelint": "^14.9.1",
     "stylelint-scss": "^4.3.0",
-    "superagent": "^8.1.2",
-    "supertest": "^6.3.3",
+    "superagent": "^9.0.2",
+    "supertest": "^7.0.0",
     "svgo": "^2.8.0",
     "table": "^6.8.1",
     "tape": "^5.0.1",
diff --git a/packages/core/http/core-http-server-internal/src/http_server.test.ts b/packages/core/http/core-http-server-internal/src/http_server.test.ts
index 129efea82cc8c..235fab185e12d 100644
--- a/packages/core/http/core-http-server-internal/src/http_server.test.ts
+++ b/packages/core/http/core-http-server-internal/src/http_server.test.ts
@@ -1622,7 +1622,7 @@ describe('setup contract', () => {
         .get('/static/some_json.json')
         .expect(200);
 
-      const etag = response.get('etag');
+      const etag = response.get('etag')!;
       expect(etag).not.toBeUndefined();
 
       await supertest(innerServer.listener)
diff --git a/packages/kbn-cli-dev-mode/src/integration_tests/base_path_proxy_server.test.ts b/packages/kbn-cli-dev-mode/src/integration_tests/base_path_proxy_server.test.ts
index 5e8a7a50a7b32..0f0a69638cfa2 100644
--- a/packages/kbn-cli-dev-mode/src/integration_tests/base_path_proxy_server.test.ts
+++ b/packages/kbn-cli-dev-mode/src/integration_tests/base_path_proxy_server.test.ts
@@ -28,7 +28,7 @@ describe('BasePathProxyServer', () => {
   let logger: TestLog;
   let config: IHttpConfig;
   let basePath: string;
-  let proxySupertest: supertest.SuperTest<supertest.Test>;
+  let proxySupertest: supertest.Agent;
 
   beforeEach(async () => {
     logger = new TestLog();
@@ -330,7 +330,7 @@ describe('BasePathProxyServer', () => {
 
   describe('shouldRedirect', () => {
     let proxyServerWithoutShouldRedirect: BasePathProxyServer;
-    let proxyWithoutShouldRedirectSupertest: supertest.SuperTest<supertest.Test>;
+    let proxyWithoutShouldRedirectSupertest: supertest.Agent;
 
     beforeEach(async () => {
       // setup and start a proxy server which does not use "shouldRedirectFromOldBasePath"
@@ -373,7 +373,7 @@ describe('BasePathProxyServer', () => {
 
   describe('constructor option for sending in a custom basePath', () => {
     let proxyServerWithFooBasePath: BasePathProxyServer;
-    let proxyWithFooBasePath: supertest.SuperTest<supertest.Test>;
+    let proxyWithFooBasePath: supertest.Agent;
 
     beforeEach(async () => {
       // setup and start a proxy server which uses a basePath of "foo"
diff --git a/src/core/server/integration_tests/http/cookie_session_storage.test.ts b/src/core/server/integration_tests/http/cookie_session_storage.test.ts
index 4a71502db0ccb..192a3daf8fd2d 100644
--- a/src/core/server/integration_tests/http/cookie_session_storage.test.ts
+++ b/src/core/server/integration_tests/http/cookie_session_storage.test.ts
@@ -134,7 +134,7 @@ describe('Cookie based SessionStorage', () => {
 
       const response = await supertest(innerServer.listener).get('/').expect(200);
 
-      const cookies = response.get('set-cookie');
+      const cookies = response.get('set-cookie')!;
       expect(cookies).toBeDefined();
       expect(cookies).toHaveLength(1);
 
@@ -172,7 +172,7 @@ describe('Cookie based SessionStorage', () => {
 
       const response = await supertest(innerServer.listener).get('/').expect(200);
 
-      const cookies = response.get('set-cookie');
+      const cookies = response.get('set-cookie')!;
       expect(cookies).toBeDefined();
       expect(cookies).toHaveLength(1);
 
@@ -204,7 +204,7 @@ describe('Cookie based SessionStorage', () => {
 
       const response = await supertest(innerServer.listener).get('/').expect(200, { value: null });
 
-      const cookies = response.get('set-cookie');
+      const cookies = response.get('set-cookie')!;
       expect(cookies).not.toBeDefined();
     });
 
@@ -237,7 +237,7 @@ describe('Cookie based SessionStorage', () => {
         .get('/')
         .expect(200, { value: userData });
 
-      const cookies = response.get('set-cookie');
+      const cookies = response.get('set-cookie')!;
       expect(cookies).toBeDefined();
 
       await delay(sessionDurationMs);
@@ -283,7 +283,7 @@ describe('Cookie based SessionStorage', () => {
         .get('/')
         .expect(200, { value: userData });
 
-      const cookies = response.get('set-cookie');
+      const cookies = response.get('set-cookie')!;
       expect(cookies).toBeDefined();
 
       const sessionCookie = retrieveSessionCookie(cookies[0]);
@@ -418,7 +418,7 @@ describe('Cookie based SessionStorage', () => {
 
       const response = await supertest(innerServer.listener).get('/').expect(200);
 
-      const cookies = response.get('set-cookie');
+      const cookies = response.get('set-cookie')!;
       const sessionCookie = retrieveSessionCookie(cookies[0]);
 
       const response2 = await supertest(innerServer.listener)
@@ -475,7 +475,7 @@ describe('Cookie based SessionStorage', () => {
 
           const response = await supertest(innerServer.listener).get('/').expect(200);
 
-          const cookies = response.get('set-cookie');
+          const cookies = response.get('set-cookie')!;
           expect(cookies).toBeDefined();
           expect(cookies).toHaveLength(1);
 
diff --git a/src/core/server/integration_tests/http/versioned_router.test.ts b/src/core/server/integration_tests/http/versioned_router.test.ts
index 86427a2488e2d..72daedb990dff 100644
--- a/src/core/server/integration_tests/http/versioned_router.test.ts
+++ b/src/core/server/integration_tests/http/versioned_router.test.ts
@@ -29,7 +29,7 @@ interface AdditionalOptions {
 
 describe('Routing versioned requests', () => {
   let router: IRouter;
-  let supertest: Supertest.SuperTest<Supertest.Test>;
+  let supertest: Supertest.Agent;
 
   async function setupServer(cliArgs: Partial<CliArgs> = {}, options: AdditionalOptions = {}) {
     logger = loggingSystemMock.create();
diff --git a/src/core/server/integration_tests/metrics/server_collector.test.ts b/src/core/server/integration_tests/metrics/server_collector.test.ts
index 6151cd1ebe6bf..481447f599b21 100644
--- a/src/core/server/integration_tests/metrics/server_collector.test.ts
+++ b/src/core/server/integration_tests/metrics/server_collector.test.ts
@@ -116,7 +116,7 @@ describe('ServerMetricsCollector', () => {
     // Subscribe to the aborted$ event
     const waitFor1stAbort = disconnectAborted$.pipe(take(1)).toPromise();
 
-    discoReq1.abort();
+    void discoReq1.abort();
 
     // Wait for the aborted$ event
     await waitFor1stAbort;
@@ -132,7 +132,7 @@ describe('ServerMetricsCollector', () => {
     // Subscribe to the aborted$ event
     const waitFor2ndAbort = disconnectAborted$.pipe(take(1)).toPromise();
 
-    discoReq2.abort();
+    void discoReq2.abort();
 
     // Wait for the aborted$ event
     await waitFor2ndAbort;
diff --git a/test/api_integration/apis/data_views/fields_route/cache.ts b/test/api_integration/apis/data_views/fields_route/cache.ts
index c97be4b7411f3..dea14dec6bdcd 100644
--- a/test/api_integration/apis/data_views/fields_route/cache.ts
+++ b/test/api_integration/apis/data_views/fields_route/cache.ts
@@ -70,7 +70,7 @@ export default function ({ getService }: FtrProviderContext) {
 
       await supertest
         .get(FIELDS_PATH)
-        .set('If-None-Match', response.get('etag'))
+        .set('If-None-Match', response.get('etag')!)
         .query({
           pattern: '*',
           include_unmapped: true,
diff --git a/test/api_integration/apis/saved_objects_management/scroll_count.ts b/test/api_integration/apis/saved_objects_management/scroll_count.ts
index 94e301a085d70..26f4f4e1a626e 100644
--- a/test/api_integration/apis/saved_objects_management/scroll_count.ts
+++ b/test/api_integration/apis/saved_objects_management/scroll_count.ts
@@ -6,7 +6,6 @@
  * Side Public License, v 1.
  */
 
-import { SuperTest, Test } from 'supertest';
 import expect from '@kbn/expect';
 import { FtrProviderContext } from '../../ftr_provider_context';
 
@@ -14,7 +13,7 @@ const apiUrl = '/api/kibana/management/saved_objects/scroll/counts';
 const defaultTypes = ['visualization', 'index-pattern', 'search', 'dashboard'];
 
 export default function ({ getService }: FtrProviderContext) {
-  const supertest = getService('supertest') as SuperTest<Test>;
+  const supertest = getService('supertest');
   const kibanaServer = getService('kibanaServer');
   const esArchiver = getService('esArchiver');
 
diff --git a/test/api_integration/apis/telemetry/opt_in.ts b/test/api_integration/apis/telemetry/opt_in.ts
index c7d8a42c6e392..a9fc5861368ca 100644
--- a/test/api_integration/apis/telemetry/opt_in.ts
+++ b/test/api_integration/apis/telemetry/opt_in.ts
@@ -87,7 +87,7 @@ export default function optInTest({ getService }: FtrProviderContext) {
 }
 
 async function postTelemetryV2OptIn(
-  supertest: SuperTest.SuperTest<SuperTest.Test>,
+  supertest: SuperTest.Agent,
   value: unknown,
   statusCode: number
 ): Promise<any> {
diff --git a/test/api_integration/services/supertest.ts b/test/api_integration/services/supertest.ts
index baf42703c64a0..d8ce0d918c45a 100644
--- a/test/api_integration/services/supertest.ts
+++ b/test/api_integration/services/supertest.ts
@@ -13,13 +13,15 @@ import { format as formatUrl } from 'url';
 import supertest from 'supertest';
 import { FtrProviderContext } from '../../functional/ftr_provider_context';
 
-export function KibanaSupertestProvider({ getService }: FtrProviderContext) {
+export function KibanaSupertestProvider({ getService }: FtrProviderContext): supertest.Agent {
   const config = getService('config');
   const kibanaServerUrl = formatUrl(config.get('servers.kibana'));
   return supertest(kibanaServerUrl);
 }
 
-export function ElasticsearchSupertestProvider({ getService }: FtrProviderContext) {
+export function ElasticsearchSupertestProvider({
+  getService,
+}: FtrProviderContext): supertest.Agent {
   const config = getService('config');
   const esServerConfig = config.get('servers.elasticsearch');
 
diff --git a/test/common/services/bsearch.ts b/test/common/services/bsearch.ts
index fd79a9b9a75e8..fd9ef7f703a0b 100644
--- a/test/common/services/bsearch.ts
+++ b/test/common/services/bsearch.ts
@@ -40,7 +40,7 @@ const getSpaceUrlPrefix = (spaceId?: string): string => {
  * Options for the send method
  */
 interface SendOptions {
-  supertest: SuperTest.SuperTest<SuperTest.Test>;
+  supertest: SuperTest.Agent;
   options: object;
   strategy: string;
   space?: string;
diff --git a/x-pack/plugins/observability_solution/apm/server/lib/helpers/create_es_client/create_apm_event_client/index.test.ts b/x-pack/plugins/observability_solution/apm/server/lib/helpers/create_es_client/create_apm_event_client/index.test.ts
index 43b31c588f422..9cab31e30af64 100644
--- a/x-pack/plugins/observability_solution/apm/server/lib/helpers/create_es_client/create_apm_event_client/index.test.ts
+++ b/x-pack/plugins/observability_solution/apm/server/lib/helpers/create_es_client/create_apm_event_client/index.test.ts
@@ -74,7 +74,7 @@ describe('APMEventClient', () => {
             resolve(undefined);
           }, 100);
         });
-        incomingRequest.abort();
+        void incomingRequest.abort();
       }, 100);
     });
 
diff --git a/x-pack/test/alerting_api_integration/common/lib/wait_for_execution_count.ts b/x-pack/test/alerting_api_integration/common/lib/wait_for_execution_count.ts
index 6ad0dab431d81..3cd95484e1d5c 100644
--- a/x-pack/test/alerting_api_integration/common/lib/wait_for_execution_count.ts
+++ b/x-pack/test/alerting_api_integration/common/lib/wait_for_execution_count.ts
@@ -13,7 +13,7 @@ async function delay(millis: number): Promise<void> {
 }
 
 export function createWaitForExecutionCount(
-  st: supertest.SuperTest<supertest.Test>,
+  st: supertest.Agent,
   spaceId?: string,
   delayMs: number = 3000
 ) {
diff --git a/x-pack/test/alerting_api_integration/observability/helpers/alerting_api_helper.ts b/x-pack/test/alerting_api_integration/observability/helpers/alerting_api_helper.ts
index bd6c7761a5fcd..1a66aa2fcd9ed 100644
--- a/x-pack/test/alerting_api_integration/observability/helpers/alerting_api_helper.ts
+++ b/x-pack/test/alerting_api_integration/observability/helpers/alerting_api_helper.ts
@@ -6,7 +6,7 @@
  */
 
 import type { Client } from '@elastic/elasticsearch';
-import type { SuperTest, Test } from 'supertest';
+import type { Agent as SuperTestAgent } from 'supertest';
 import { ToolingLog } from '@kbn/tooling-log';
 import { ThresholdParams } from '@kbn/observability-plugin/common/custom_threshold_rule/types';
 import { refreshSavedObjectIndices } from './refresh_index';
@@ -17,7 +17,7 @@ export async function createIndexConnector({
   indexName,
   logger,
 }: {
-  supertest: SuperTest<Test>;
+  supertest: SuperTestAgent;
   name: string;
   indexName: string;
   logger: ToolingLog;
@@ -51,7 +51,7 @@ export async function createRule<Params = ThresholdParams>({
   logger,
   esClient,
 }: {
-  supertest: SuperTest<Test>;
+  supertest: SuperTestAgent;
   ruleTypeId: string;
   name: string;
   params: Params;
diff --git a/x-pack/test/alerting_api_integration/observability/helpers/alerting_wait_for_helpers.ts b/x-pack/test/alerting_api_integration/observability/helpers/alerting_wait_for_helpers.ts
index 63960b222cede..032435a03e007 100644
--- a/x-pack/test/alerting_api_integration/observability/helpers/alerting_wait_for_helpers.ts
+++ b/x-pack/test/alerting_api_integration/observability/helpers/alerting_wait_for_helpers.ts
@@ -29,7 +29,7 @@ export async function waitForRuleStatus({
 }: {
   id: string;
   expectedStatus: string;
-  supertest: SuperTest.SuperTest<SuperTest.Test>;
+  supertest: SuperTest.Agent;
   retryService: RetryService;
   logger: ToolingLog;
 }): Promise<Record<string, any>> {
diff --git a/x-pack/test/alerting_api_integration/observability/helpers/data_view.ts b/x-pack/test/alerting_api_integration/observability/helpers/data_view.ts
index 1f84b2556ab70..3fdceed845856 100644
--- a/x-pack/test/alerting_api_integration/observability/helpers/data_view.ts
+++ b/x-pack/test/alerting_api_integration/observability/helpers/data_view.ts
@@ -5,7 +5,7 @@
  * 2.0.
  */
 
-import { SuperTest, Test } from 'supertest';
+import { Agent as SuperTestAgent } from 'supertest';
 import { ToolingLog } from '@kbn/tooling-log';
 
 export const createDataView = async ({
@@ -15,7 +15,7 @@ export const createDataView = async ({
   title,
   logger,
 }: {
-  supertest: SuperTest<Test>;
+  supertest: SuperTestAgent;
   id: string;
   name: string;
   title: string;
@@ -50,7 +50,7 @@ export const deleteDataView = async ({
   id,
   logger,
 }: {
-  supertest: SuperTest<Test>;
+  supertest: SuperTestAgent;
   id: string;
   logger: ToolingLog;
 }) => {
diff --git a/x-pack/test/alerting_api_integration/security_and_spaces/group1/tests/alerting/find.ts b/x-pack/test/alerting_api_integration/security_and_spaces/group1/tests/alerting/find.ts
index 9816059995142..7abc1b134f01d 100644
--- a/x-pack/test/alerting_api_integration/security_and_spaces/group1/tests/alerting/find.ts
+++ b/x-pack/test/alerting_api_integration/security_and_spaces/group1/tests/alerting/find.ts
@@ -6,7 +6,7 @@
  */
 
 import expect from '@kbn/expect';
-import { SuperTest, Test } from 'supertest';
+import { Agent as SuperTestAgent } from 'supertest';
 import { chunk, omit } from 'lodash';
 import { v4 as uuidv4 } from 'uuid';
 import { SuperuserAtSpace1, UserAtSpaceScenarios } from '../../../scenarios';
@@ -16,7 +16,7 @@ import { FtrProviderContext } from '../../../../common/ftr_provider_context';
 const findTestUtils = (
   describeType: 'internal' | 'public',
   objectRemover: ObjectRemover,
-  supertest: SuperTest<Test>,
+  supertest: SuperTestAgent,
   supertestWithoutAuth: any
 ) => {
   describe.skip(describeType, () => {
diff --git a/x-pack/test/alerting_api_integration/security_and_spaces/group1/tests/alerting/find_with_post.ts b/x-pack/test/alerting_api_integration/security_and_spaces/group1/tests/alerting/find_with_post.ts
index 7b60595c4d66e..82956536c6d1a 100644
--- a/x-pack/test/alerting_api_integration/security_and_spaces/group1/tests/alerting/find_with_post.ts
+++ b/x-pack/test/alerting_api_integration/security_and_spaces/group1/tests/alerting/find_with_post.ts
@@ -6,7 +6,7 @@
  */
 
 import expect from '@kbn/expect';
-import { SuperTest, Test } from 'supertest';
+import { Agent as SuperTestAgent } from 'supertest';
 import { chunk, omit } from 'lodash';
 import { v4 as uuidv4 } from 'uuid';
 import { UserAtSpaceScenarios } from '../../../scenarios';
@@ -16,7 +16,7 @@ import { FtrProviderContext } from '../../../../common/ftr_provider_context';
 const findTestUtils = (
   describeType: 'internal' | 'public',
   objectRemover: ObjectRemover,
-  supertest: SuperTest<Test>,
+  supertest: SuperTestAgent,
   supertestWithoutAuth: any
 ) => {
   // FLAKY: https://github.com/elastic/kibana/issues/182314
diff --git a/x-pack/test/alerting_api_integration/security_and_spaces/group1/tests/alerting/get.ts b/x-pack/test/alerting_api_integration/security_and_spaces/group1/tests/alerting/get.ts
index 6d245ed28cc00..fa362249229e3 100644
--- a/x-pack/test/alerting_api_integration/security_and_spaces/group1/tests/alerting/get.ts
+++ b/x-pack/test/alerting_api_integration/security_and_spaces/group1/tests/alerting/get.ts
@@ -6,7 +6,7 @@
  */
 
 import expect from '@kbn/expect';
-import { SuperTest, Test } from 'supertest';
+import { Agent as SuperTestAgent } from 'supertest';
 import { SuperuserAtSpace1, UserAtSpaceScenarios } from '../../../scenarios';
 import {
   getUrlPrefix,
@@ -19,7 +19,7 @@ import { FtrProviderContext } from '../../../../common/ftr_provider_context';
 const getTestUtils = (
   describeType: 'internal' | 'public',
   objectRemover: ObjectRemover,
-  supertest: SuperTest<Test>,
+  supertest: SuperTestAgent,
   supertestWithoutAuth: any
 ) => {
   describe(describeType, () => {
diff --git a/x-pack/test/alerting_api_integration/security_and_spaces/group2/tests/actions/connector_types/crowdstrike.ts b/x-pack/test/alerting_api_integration/security_and_spaces/group2/tests/actions/connector_types/crowdstrike.ts
index 7b4d064eb6b6e..c9d1ca8814592 100644
--- a/x-pack/test/alerting_api_integration/security_and_spaces/group2/tests/actions/connector_types/crowdstrike.ts
+++ b/x-pack/test/alerting_api_integration/security_and_spaces/group2/tests/actions/connector_types/crowdstrike.ts
@@ -131,7 +131,7 @@ export default function createCrowdstrikeTests({ getService }: FtrProviderContex
         password = 'changeme',
         errorLogger = logErrorDetails,
       }: {
-        supertest: SuperTest.SuperTest<SuperTest.Test>;
+        supertest: SuperTest.Agent;
         subAction: string;
         subActionParams: Record<string, unknown>;
         expectedHttpCode?: number;
diff --git a/x-pack/test/alerting_api_integration/security_and_spaces/group2/tests/actions/connector_types/sentinelone.ts b/x-pack/test/alerting_api_integration/security_and_spaces/group2/tests/actions/connector_types/sentinelone.ts
index 4b184ccb7a595..bf6f88be08fdf 100644
--- a/x-pack/test/alerting_api_integration/security_and_spaces/group2/tests/actions/connector_types/sentinelone.ts
+++ b/x-pack/test/alerting_api_integration/security_and_spaces/group2/tests/actions/connector_types/sentinelone.ts
@@ -140,7 +140,7 @@ export default function createSentinelOneTests({ getService }: FtrProviderContex
         password = 'changeme',
         errorLogger = logErrorDetails,
       }: {
-        supertest: SuperTest.SuperTest<SuperTest.Test>;
+        supertest: SuperTest.Agent;
         subAction: string;
         subActionParams: Record<string, unknown>;
         expectedHttpCode?: number;
diff --git a/x-pack/test/alerting_api_integration/security_and_spaces/group2/tests/actions/sub_action_framework/index.ts b/x-pack/test/alerting_api_integration/security_and_spaces/group2/tests/actions/sub_action_framework/index.ts
index 0a363e001535b..85e3b8405257f 100644
--- a/x-pack/test/alerting_api_integration/security_and_spaces/group2/tests/actions/sub_action_framework/index.ts
+++ b/x-pack/test/alerting_api_integration/security_and_spaces/group2/tests/actions/sub_action_framework/index.ts
@@ -22,7 +22,7 @@ const createSubActionConnector = async ({
   connectorTypeId = 'test.sub-action-connector',
   expectedHttpCode = 200,
 }: {
-  supertest: SuperTest.SuperTest<SuperTest.Test>;
+  supertest: SuperTest.Agent;
   config?: Record<string, unknown>;
   secrets?: Record<string, unknown>;
   connectorTypeId?: string;
@@ -56,7 +56,7 @@ const executeSubAction = async ({
   subActionParams,
   expectedHttpCode = 200,
 }: {
-  supertest: SuperTest.SuperTest<SuperTest.Test>;
+  supertest: SuperTest.Agent;
   connectorId: string;
   subAction: string;
   subActionParams: Record<string, unknown>;
diff --git a/x-pack/test/alerting_api_integration/spaces_only/tests/actions/connector_types/stack/webhook.ts b/x-pack/test/alerting_api_integration/spaces_only/tests/actions/connector_types/stack/webhook.ts
index f3b3a4e7076ef..ad6a8d12baed3 100644
--- a/x-pack/test/alerting_api_integration/spaces_only/tests/actions/connector_types/stack/webhook.ts
+++ b/x-pack/test/alerting_api_integration/spaces_only/tests/actions/connector_types/stack/webhook.ts
@@ -8,7 +8,7 @@
 import http from 'http';
 import https from 'https';
 import getPort from 'get-port';
-import { SuperTest, Test } from 'supertest';
+import { Agent as SuperTestAgent } from 'supertest';
 import expect from '@kbn/expect';
 import { URL, format as formatUrl } from 'url';
 import {
@@ -177,7 +177,7 @@ export default function webhookTest({ getService }: FtrProviderContext) {
 }
 
 export async function createWebhookAction(
-  supertest: SuperTest<Test>,
+  supertest: SuperTestAgent,
   webhookSimulatorURL: string,
   config: Record<string, string | Record<string, string>> = {}
 ): Promise<string> {
diff --git a/x-pack/test/alerting_api_integration/spaces_only/tests/alerting/group1/find.ts b/x-pack/test/alerting_api_integration/spaces_only/tests/alerting/group1/find.ts
index a83ec1e70a0a1..d38bb2f40a275 100644
--- a/x-pack/test/alerting_api_integration/spaces_only/tests/alerting/group1/find.ts
+++ b/x-pack/test/alerting_api_integration/spaces_only/tests/alerting/group1/find.ts
@@ -6,7 +6,7 @@
  */
 
 import expect from '@kbn/expect';
-import { SuperTest, Test } from 'supertest';
+import { Agent as SuperTestAgent } from 'supertest';
 import { fromKueryExpression } from '@kbn/es-query';
 import { Spaces } from '../../../scenarios';
 import { getUrlPrefix, getTestRuleData, ObjectRemover } from '../../../../common/lib';
@@ -14,7 +14,7 @@ import { FtrProviderContext } from '../../../../common/ftr_provider_context';
 
 async function createAlert(
   objectRemover: ObjectRemover,
-  supertest: SuperTest<Test>,
+  supertest: SuperTestAgent,
   overwrites = {}
 ) {
   const { body: createdAlert } = await supertest
@@ -28,7 +28,7 @@ async function createAlert(
 
 const findTestUtils = (
   describeType: 'internal' | 'public',
-  supertest: SuperTest<Test>,
+  supertest: SuperTestAgent,
   objectRemover: ObjectRemover
 ) => {
   describe(describeType, () => {
diff --git a/x-pack/test/alerting_api_integration/spaces_only/tests/alerting/group1/get.ts b/x-pack/test/alerting_api_integration/spaces_only/tests/alerting/group1/get.ts
index 51f246e2c5609..c22e8233f2d73 100644
--- a/x-pack/test/alerting_api_integration/spaces_only/tests/alerting/group1/get.ts
+++ b/x-pack/test/alerting_api_integration/spaces_only/tests/alerting/group1/get.ts
@@ -6,7 +6,7 @@
  */
 
 import expect from '@kbn/expect';
-import { SuperTest, Test } from 'supertest';
+import { Agent as SuperTestAgent } from 'supertest';
 import { Spaces } from '../../../scenarios';
 import { getUrlPrefix, getTestRuleData, ObjectRemover } from '../../../../common/lib';
 import { FtrProviderContext } from '../../../../common/ftr_provider_context';
@@ -14,7 +14,7 @@ import { FtrProviderContext } from '../../../../common/ftr_provider_context';
 const getTestUtils = (
   describeType: 'internal' | 'public',
   objectRemover: ObjectRemover,
-  supertest: SuperTest<Test>
+  supertest: SuperTestAgent
 ) => {
   describe(describeType, () => {
     afterEach(() => objectRemover.removeAll());
diff --git a/x-pack/test/alerting_api_integration/spaces_only/tests/alerting/group3/test_helpers.ts b/x-pack/test/alerting_api_integration/spaces_only/tests/alerting/group3/test_helpers.ts
index a898cc14b9104..b2196d9ea3724 100644
--- a/x-pack/test/alerting_api_integration/spaces_only/tests/alerting/group3/test_helpers.ts
+++ b/x-pack/test/alerting_api_integration/spaces_only/tests/alerting/group3/test_helpers.ts
@@ -8,7 +8,7 @@
 import moment from 'moment';
 import type { RetryService } from '@kbn/ftr-common-functional-services';
 import type { IValidatedEvent } from '@kbn/event-log-plugin/server';
-import type { SuperTest, Test } from 'supertest';
+import type { Agent as SuperTestAgent } from 'supertest';
 import expect from '@kbn/expect';
 import type { FtrProviderContext } from '../../../../common/ftr_provider_context';
 import { getUrlPrefix, getTestRuleData, ObjectRemover, getEventLog } from '../../../../common/lib';
@@ -23,7 +23,7 @@ export const createRule = async ({
 }: {
   actionId: string;
   pattern: { instance: boolean[] };
-  supertest: SuperTest<Test>;
+  supertest: SuperTestAgent;
   objectRemover: ObjectRemover;
   overwrites?: any;
 }) => {
@@ -65,7 +65,7 @@ export const createAction = async ({
   supertest,
   objectRemover,
 }: {
-  supertest: SuperTest<Test>;
+  supertest: SuperTestAgent;
   objectRemover: ObjectRemover;
 }) => {
   const { body: createdAction } = await supertest
@@ -89,7 +89,7 @@ export const createMaintenanceWindow = async ({
   objectRemover,
 }: {
   overwrites?: any;
-  supertest: SuperTest<Test>;
+  supertest: SuperTestAgent;
   objectRemover: ObjectRemover;
 }) => {
   const { body: window } = await supertest
@@ -112,11 +112,7 @@ export const createMaintenanceWindow = async ({
   return window;
 };
 
-export const getActiveMaintenanceWindows = async ({
-  supertest,
-}: {
-  supertest: SuperTest<Test>;
-}) => {
+export const getActiveMaintenanceWindows = async ({ supertest }: { supertest: SuperTestAgent }) => {
   const { body: activeMaintenanceWindows } = await supertest
     .get(`${getUrlPrefix(Spaces.space1.id)}/internal/alerting/rules/maintenance_window/_active`)
     .set('kbn-xsrf', 'foo')
@@ -130,7 +126,7 @@ export const finishMaintenanceWindow = async ({
   supertest,
 }: {
   id: string;
-  supertest: SuperTest<Test>;
+  supertest: SuperTestAgent;
 }) => {
   return supertest
     .post(
@@ -188,7 +184,7 @@ export const expectNoActionsFired = async ({
   retry,
 }: {
   id: string;
-  supertest: SuperTest<Test>;
+  supertest: SuperTestAgent;
   retry: RetryService;
 }) => {
   const events = await retry.try(async () => {
@@ -215,7 +211,7 @@ export const runSoon = async ({
   retry,
 }: {
   id: string;
-  supertest: SuperTest<Test>;
+  supertest: SuperTestAgent;
   retry: RetryService;
 }) => {
   return retry.try(async () => {
diff --git a/x-pack/test/api_integration/apis/asset_manager/tests/helpers.ts b/x-pack/test/api_integration/apis/asset_manager/tests/helpers.ts
index 3d1086ca8b8e4..94ab2f5b99ffe 100644
--- a/x-pack/test/api_integration/apis/asset_manager/tests/helpers.ts
+++ b/x-pack/test/api_integration/apis/asset_manager/tests/helpers.ts
@@ -9,11 +9,11 @@ import type { AssetWithoutTimestamp } from '@kbn/assetManager-plugin/common/type
 import type { WriteSamplesPostBody } from '@kbn/assetManager-plugin/server';
 import { apm, infra, timerange } from '@kbn/apm-synthtrace-client';
 import expect from '@kbn/expect';
-import { SuperTest, Test } from 'supertest';
+import { Agent as SuperTestAgent } from 'supertest';
 
 const SAMPLE_ASSETS_ENDPOINT = '/api/asset-manager/assets/sample';
 
-export type KibanaSupertest = SuperTest<Test>;
+export type KibanaSupertest = SuperTestAgent;
 
 // NOTE: In almost every case in tests, you want { refresh: true }
 // in the options of this function, so it is defaulted to that value.
diff --git a/x-pack/test/api_integration/apis/cloud_security_posture/helper.ts b/x-pack/test/api_integration/apis/cloud_security_posture/helper.ts
index 03a61807f1b31..5565e7a6e096b 100644
--- a/x-pack/test/api_integration/apis/cloud_security_posture/helper.ts
+++ b/x-pack/test/api_integration/apis/cloud_security_posture/helper.ts
@@ -5,7 +5,7 @@
  * 2.0.
  */
 
-import type { SuperTest, Test } from 'supertest';
+import type { Agent as SuperTestAgent } from 'supertest';
 import { Client } from '@elastic/elasticsearch';
 import expect from '@kbn/expect';
 import { ELASTIC_HTTP_VERSION_HEADER } from '@kbn/core-http-common';
@@ -43,7 +43,7 @@ export const addIndex = async <T>(es: Client, findingsMock: T[], indexName: stri
 };
 
 export async function createPackagePolicy(
-  supertest: SuperTest<Test>,
+  supertest: SuperTestAgent,
   agentPolicyId: string,
   policyTemplate: string,
   input: string,
diff --git a/x-pack/test/api_integration/apis/management/index_management/lib/templates.api.ts b/x-pack/test/api_integration/apis/management/index_management/lib/templates.api.ts
index e929cbff2f188..bae578e6c0490 100644
--- a/x-pack/test/api_integration/apis/management/index_management/lib/templates.api.ts
+++ b/x-pack/test/api_integration/apis/management/index_management/lib/templates.api.ts
@@ -36,7 +36,9 @@ export function templatesApi(getService: FtrProviderContext['getService']) {
       .send(payload);
 
   // Delete all templates created during tests
-  const cleanUpTemplates = async (additionalRequestHeaders: object = {}) => {
+  const cleanUpTemplates = async (
+    additionalRequestHeaders: Record<string, string | string[]> = {}
+  ) => {
     try {
       await deleteTemplates(templatesCreated).set(additionalRequestHeaders);
       templatesCreated = [];
diff --git a/x-pack/test/api_integration/apis/metrics_ui/helpers.ts b/x-pack/test/api_integration/apis/metrics_ui/helpers.ts
index b5375b8d70cab..427909e10ac94 100644
--- a/x-pack/test/api_integration/apis/metrics_ui/helpers.ts
+++ b/x-pack/test/api_integration/apis/metrics_ui/helpers.ts
@@ -6,9 +6,6 @@
  */
 
 import { apm, timerange } from '@kbn/apm-synthtrace-client';
-import { SuperTest, Test } from 'supertest';
-
-export type KibanaSupertest = SuperTest<Test>;
 
 // generates traces, metrics for services
 export function generateServicesData({
diff --git a/x-pack/test/api_integration/apis/telemetry/telemetry.ts b/x-pack/test/api_integration/apis/telemetry/telemetry.ts
index 3652b32d9a372..203189906f812 100644
--- a/x-pack/test/api_integration/apis/telemetry/telemetry.ts
+++ b/x-pack/test/api_integration/apis/telemetry/telemetry.ts
@@ -50,7 +50,7 @@ function getCacheDetails(body: UnencryptedTelemetryPayload): CacheDetails[] {
  * @param timestamp The new timestamp to be set
  */
 function updateMonitoringDates(
-  esSupertest: SuperTest.SuperTest<SuperTest.Test>,
+  esSupertest: SuperTest.Agent,
   fromTimestamp: string,
   toTimestamp: string,
   timestamp: string
diff --git a/x-pack/test/apm_api_integration/common/apm_api_supertest.ts b/x-pack/test/apm_api_integration/common/apm_api_supertest.ts
index 9e4f25a7c7c7b..330de33dc7ab6 100644
--- a/x-pack/test/apm_api_integration/common/apm_api_supertest.ts
+++ b/x-pack/test/apm_api_integration/common/apm_api_supertest.ts
@@ -15,7 +15,7 @@ import type {
 import type { APIEndpoint } from '@kbn/apm-plugin/server';
 import { formatRequest } from '@kbn/server-route-repository';
 
-export function createApmApiClient(st: supertest.SuperTest<supertest.Test>) {
+export function createApmApiClient(st: supertest.Agent) {
   return async <TEndpoint extends APIEndpoint>(
     options: {
       type?: 'form-data';
diff --git a/x-pack/test/apm_api_integration/common/bettertest.ts b/x-pack/test/apm_api_integration/common/bettertest.ts
index e1132be3f9a77..8665d200fd15f 100644
--- a/x-pack/test/apm_api_integration/common/bettertest.ts
+++ b/x-pack/test/apm_api_integration/common/bettertest.ts
@@ -30,7 +30,7 @@ export interface BetterTestResponse<T> {
  * This is useful for tests that expect a 200 response
  * It also makes it easier to debug tests that fail because of a 500 response.
  */
-export function getBettertest(st: supertest.SuperTest<supertest.Test>) {
+export function getBettertest(st: supertest.Agent) {
   return async <T>({
     pathname,
     method = 'get',
diff --git a/x-pack/test/apm_api_integration/tests/alerts/helpers/alerting_api_helper.ts b/x-pack/test/apm_api_integration/tests/alerts/helpers/alerting_api_helper.ts
index e4cc8d302ba4a..5da6ee4f860d0 100644
--- a/x-pack/test/apm_api_integration/tests/alerts/helpers/alerting_api_helper.ts
+++ b/x-pack/test/apm_api_integration/tests/alerts/helpers/alerting_api_helper.ts
@@ -8,7 +8,7 @@
 import { Client, errors } from '@elastic/elasticsearch';
 import { ParsedTechnicalFields } from '@kbn/rule-registry-plugin/common';
 import pRetry from 'p-retry';
-import type { SuperTest, Test } from 'supertest';
+import type { Agent as SuperTestAgent } from 'supertest';
 import { ApmRuleType } from '@kbn/rule-data-utils';
 import { ApmRuleParamsType } from '@kbn/apm-plugin/common/rules/schema';
 import { ApmDocumentType } from '@kbn/apm-plugin/common/document_type';
@@ -26,7 +26,7 @@ export async function createApmRule<T extends ApmRuleType>({
   params,
   actions = [],
 }: {
-  supertest: SuperTest<Test>;
+  supertest: SuperTestAgent;
   ruleTypeId: T;
   name: string;
   params: ApmRuleParamsType[T];
@@ -111,7 +111,7 @@ export async function runRuleSoon({
   supertest,
 }: {
   ruleId: string;
-  supertest: SuperTest<Test>;
+  supertest: SuperTestAgent;
 }): Promise<Record<string, any>> {
   return pRetry(
     async () => {
@@ -143,13 +143,13 @@ export async function deleteRuleById({
   supertest,
   ruleId,
 }: {
-  supertest: SuperTest<Test>;
+  supertest: SuperTestAgent;
   ruleId: string;
 }) {
   await supertest.delete(`/api/alerting/rule/${ruleId}`).set('kbn-xsrf', 'foo');
 }
 
-export async function deleteApmRules(supertest: SuperTest<Test>) {
+export async function deleteApmRules(supertest: SuperTestAgent) {
   const res = await supertest.get(
     `/api/alerting/rules/_find?filter=alert.attributes.consumer:apm&per_page=10000`
   );
@@ -180,7 +180,7 @@ export async function createIndexConnector({
   supertest,
   name,
 }: {
-  supertest: SuperTest<Test>;
+  supertest: SuperTestAgent;
   name: string;
 }) {
   const { body } = await supertest
@@ -228,7 +228,7 @@ export async function deleteAllActionConnectors({
   supertest,
   es,
 }: {
-  supertest: SuperTest<Test>;
+  supertest: SuperTestAgent;
   es: Client;
 }): Promise<any> {
   const res = await supertest.get(`/api/actions/connectors`);
@@ -245,7 +245,7 @@ async function deleteActionConnector({
   supertest,
   actionId,
 }: {
-  supertest: SuperTest<Test>;
+  supertest: SuperTestAgent;
   actionId: string;
 }) {
   return supertest.delete(`/api/actions/connector/${actionId}`).set('kbn-xsrf', 'foo');
diff --git a/x-pack/test/apm_api_integration/tests/alerts/helpers/cleanup_rule_and_alert_state.ts b/x-pack/test/apm_api_integration/tests/alerts/helpers/cleanup_rule_and_alert_state.ts
index ae97266ee084c..2fae6c9643ff7 100644
--- a/x-pack/test/apm_api_integration/tests/alerts/helpers/cleanup_rule_and_alert_state.ts
+++ b/x-pack/test/apm_api_integration/tests/alerts/helpers/cleanup_rule_and_alert_state.ts
@@ -7,7 +7,7 @@
 
 import { Client } from '@elastic/elasticsearch';
 import { ToolingLog } from '@kbn/tooling-log';
-import type { SuperTest, Test } from 'supertest';
+import type { Agent as SuperTestAgent } from 'supertest';
 import {
   clearKibanaApmEventLog,
   deleteApmRules,
@@ -22,7 +22,7 @@ export async function cleanupRuleAndAlertState({
   logger,
 }: {
   es: Client;
-  supertest: SuperTest<Test>;
+  supertest: SuperTestAgent;
   logger: ToolingLog;
 }) {
   try {
diff --git a/x-pack/test/apm_api_integration/tests/alerts/helpers/wait_for_active_rule.ts b/x-pack/test/apm_api_integration/tests/alerts/helpers/wait_for_active_rule.ts
index 29dc20840cec5..a2ee7253e9b8c 100644
--- a/x-pack/test/apm_api_integration/tests/alerts/helpers/wait_for_active_rule.ts
+++ b/x-pack/test/apm_api_integration/tests/alerts/helpers/wait_for_active_rule.ts
@@ -17,7 +17,7 @@ export async function waitForActiveRule({
   logger,
 }: {
   ruleId: string;
-  supertest: SuperTest.SuperTest<SuperTest.Test>;
+  supertest: SuperTest.Agent;
   logger?: ToolingLog;
 }): Promise<Record<string, any>> {
   return pRetry(
diff --git a/x-pack/test/cases_api_integration/common/lib/alerts.ts b/x-pack/test/cases_api_integration/common/lib/alerts.ts
index a74524c448493..8df074b0d3474 100644
--- a/x-pack/test/cases_api_integration/common/lib/alerts.ts
+++ b/x-pack/test/cases_api_integration/common/lib/alerts.ts
@@ -30,7 +30,7 @@ import { createComment, deleteAllComments } from './api';
 import { postCaseReq } from './mock';
 
 export const createSecuritySolutionAlerts = async (
-  supertest: SuperTest.SuperTest<SuperTest.Test>,
+  supertest: SuperTest.Agent,
   log: ToolingLog,
   numberOfSignals: number = 1
 ): Promise<estypes.SearchResponse<DetectionAlert & RiskEnrichmentFields>> => {
@@ -47,7 +47,7 @@ export const createSecuritySolutionAlerts = async (
 };
 
 export const getSecuritySolutionAlerts = async (
-  supertest: SuperTest.SuperTest<SuperTest.Test>,
+  supertest: SuperTest.Agent,
   alertIds: string[]
 ): Promise<estypes.SearchResponse<DetectionAlert & RiskEnrichmentFields>> => {
   const { body: updatedAlert } = await supertest
@@ -70,7 +70,7 @@ export const getAlertById = async ({
   expectedHttpCode = 200,
   auth = { user: superUser, space: null },
 }: {
-  supertest: SuperTest.SuperTest<SuperTest.Test>;
+  supertest: SuperTest.Agent;
   id: string;
   index: string;
   expectedHttpCode?: number;
@@ -97,7 +97,7 @@ export const createCaseAttachAlertAndDeleteAlert = async ({
   alerts,
   getAlerts,
 }: {
-  supertest: SuperTest.SuperTest<SuperTest.Test>;
+  supertest: SuperTest.Agent;
   totalCases: number;
   indexOfCaseToDelete: number;
   owner: string;
@@ -145,7 +145,7 @@ export const createCaseAttachAlertAndDeleteCase = async ({
   alerts,
   getAlerts,
 }: {
-  supertest: SuperTest.SuperTest<SuperTest.Test>;
+  supertest: SuperTest.Agent;
   totalCases: number;
   indicesOfCaseToDelete: number[];
   owner: string;
@@ -194,7 +194,7 @@ export const createCaseAndAttachAlert = async ({
   alerts,
   getAlerts,
 }: {
-  supertest: SuperTest.SuperTest<SuperTest.Test>;
+  supertest: SuperTest.Agent;
   totalCases: number;
   owner: string;
   alerts: Alerts;
diff --git a/x-pack/test/cases_api_integration/common/lib/api/attachments.ts b/x-pack/test/cases_api_integration/common/lib/api/attachments.ts
index 1dbee9fbd4616..2f598f5a23b11 100644
--- a/x-pack/test/cases_api_integration/common/lib/api/attachments.ts
+++ b/x-pack/test/cases_api_integration/common/lib/api/attachments.ts
@@ -33,7 +33,7 @@ export const bulkGetAttachments = async ({
   expectedHttpCode = 200,
   auth = { user: superUser, space: null },
 }: {
-  supertest: SuperTest.SuperTest<SuperTest.Test>;
+  supertest: SuperTest.Agent;
   attachmentIds: string[];
   caseId: string;
   auth?: { user: User; space: string | null };
@@ -57,12 +57,12 @@ export const createComment = async ({
   expectedHttpCode = 200,
   headers = {},
 }: {
-  supertest: SuperTest.SuperTest<SuperTest.Test>;
+  supertest: SuperTest.Agent;
   caseId: string;
   params: AttachmentRequest;
   auth?: { user: User; space: string | null } | null;
   expectedHttpCode?: number;
-  headers?: Record<string, unknown>;
+  headers?: Record<string, string | string[]>;
 }): Promise<Case> => {
   const apiCall = supertest.post(
     `${getSpaceUrlPrefix(auth?.space)}${CASES_URL}/${caseId}/comments`
@@ -86,7 +86,7 @@ export const bulkCreateAttachments = async ({
   auth = { user: superUser, space: null },
   expectedHttpCode = 200,
 }: {
-  supertest: SuperTest.SuperTest<SuperTest.Test>;
+  supertest: SuperTest.Agent;
   caseId: string;
   params: BulkCreateAttachmentsRequest;
   auth?: { user: User; space: string | null };
@@ -110,7 +110,7 @@ export const createCaseAndBulkCreateAttachments = async ({
   auth = { user: superUser, space: null },
   expectedHttpCode = 200,
 }: {
-  supertest: SuperTest.SuperTest<SuperTest.Test>;
+  supertest: SuperTest.Agent;
   numberOfAttachments?: number;
   auth?: { user: User; space: string | null };
   expectedHttpCode?: number;
@@ -156,7 +156,7 @@ export const deleteComment = async ({
   expectedHttpCode = 204,
   auth = { user: superUser, space: null },
 }: {
-  supertest: SuperTest.SuperTest<SuperTest.Test>;
+  supertest: SuperTest.Agent;
   caseId: string;
   commentId: string;
   expectedHttpCode?: number;
@@ -178,7 +178,7 @@ export const deleteAllComments = async ({
   expectedHttpCode = 204,
   auth = { user: superUser, space: null },
 }: {
-  supertest: SuperTest.SuperTest<SuperTest.Test>;
+  supertest: SuperTest.Agent;
   caseId: string;
   expectedHttpCode?: number;
   auth?: { user: User; space: string | null };
@@ -199,7 +199,7 @@ export const getAllComments = async ({
   expectedHttpCode = 200,
   auth = { user: superUser, space: null },
 }: {
-  supertest: SuperTest.SuperTest<SuperTest.Test>;
+  supertest: SuperTest.Agent;
   caseId: string;
   auth?: { user: User; space: string | null };
   expectedHttpCode?: number;
@@ -219,7 +219,7 @@ export const getComment = async ({
   expectedHttpCode = 200,
   auth = { user: superUser, space: null },
 }: {
-  supertest: SuperTest.SuperTest<SuperTest.Test>;
+  supertest: SuperTest.Agent;
   caseId: string;
   commentId: string;
   expectedHttpCode?: number;
@@ -241,12 +241,12 @@ export const updateComment = async ({
   auth = { user: superUser, space: null },
   headers = {},
 }: {
-  supertest: SuperTest.SuperTest<SuperTest.Test>;
+  supertest: SuperTest.Agent;
   caseId: string;
   req: AttachmentPatchRequest;
   expectedHttpCode?: number;
   auth?: { user: User; space: string | null } | null;
-  headers?: Record<string, unknown>;
+  headers?: Record<string, string | string[]>;
 }): Promise<Case> => {
   const apiCall = supertest.patch(
     `${getSpaceUrlPrefix(auth?.space)}${CASES_URL}/${caseId}/comments`
@@ -269,7 +269,7 @@ export const bulkDeleteFileAttachments = async ({
   expectedHttpCode = 204,
   auth = { user: superUser, space: null },
 }: {
-  supertest: SuperTest.SuperTest<SuperTest.Test>;
+  supertest: SuperTest.Agent;
   caseId: string;
   fileIds: string[];
   expectedHttpCode?: number;
@@ -290,7 +290,7 @@ export const findAttachments = async ({
   expectedHttpCode = 200,
   auth = { user: superUser, space: null },
 }: {
-  supertest: SuperTest.SuperTest<SuperTest.Test>;
+  supertest: SuperTest.Agent;
   caseId: string;
   query?: Record<string, unknown>;
   expectedHttpCode?: number;
diff --git a/x-pack/test/cases_api_integration/common/lib/api/case.ts b/x-pack/test/cases_api_integration/common/lib/api/case.ts
index a6605d8e83aab..dd1b668b429cf 100644
--- a/x-pack/test/cases_api_integration/common/lib/api/case.ts
+++ b/x-pack/test/cases_api_integration/common/lib/api/case.ts
@@ -15,11 +15,11 @@ import { superUser } from '../authentication/users';
 import { getSpaceUrlPrefix, setupAuth } from './helpers';
 
 export const createCase = async (
-  supertest: SuperTest.SuperTest<SuperTest.Test>,
+  supertest: SuperTest.Agent,
   params: CasePostRequest,
   expectedHttpCode: number = 200,
   auth: { user: User; space: string | null } | null = { user: superUser, space: null },
-  headers: Record<string, unknown> = {}
+  headers: Record<string, string | string[]> = {}
 ): Promise<Case> => {
   const apiCall = supertest.post(`${getSpaceUrlPrefix(auth?.space)}${CASES_URL}`);
 
@@ -44,7 +44,7 @@ export const deleteCases = async ({
   expectedHttpCode = 204,
   auth = { user: superUser, space: null },
 }: {
-  supertest: SuperTest.SuperTest<SuperTest.Test>;
+  supertest: SuperTest.Agent;
   caseIDs: string[];
   expectedHttpCode?: number;
   auth?: { user: User; space: string | null };
diff --git a/x-pack/test/cases_api_integration/common/lib/api/configuration.ts b/x-pack/test/cases_api_integration/common/lib/api/configuration.ts
index cfaa18b430c11..c74c6be78da82 100644
--- a/x-pack/test/cases_api_integration/common/lib/api/configuration.ts
+++ b/x-pack/test/cases_api_integration/common/lib/api/configuration.ts
@@ -60,11 +60,11 @@ export const getConfigurationOutput = (update = false, overwrite = {}): Partial<
 };
 
 export const createConfiguration = async (
-  supertest: SuperTest.SuperTest<SuperTest.Test>,
+  supertest: SuperTest.Agent,
   req: ConfigurationRequest = getConfigurationRequest(),
   expectedHttpCode: number = 200,
   auth: { user: User; space: string | null } | null = { user: superUser, space: null },
-  headers: Record<string, unknown> = {}
+  headers: Record<string, string | string[]> = {}
 ): Promise<Configuration> => {
   const apiCall = supertest.post(`${getSpaceUrlPrefix(auth?.space)}${CASE_CONFIGURE_URL}`);
 
@@ -86,7 +86,7 @@ export const getConfiguration = async ({
   expectedHttpCode = 200,
   auth = { user: superUser, space: null },
 }: {
-  supertest: SuperTest.SuperTest<SuperTest.Test>;
+  supertest: SuperTest.Agent;
   query?: Record<string, unknown>;
   expectedHttpCode?: number;
   auth?: { user: User; space: string | null };
@@ -102,12 +102,12 @@ export const getConfiguration = async ({
 };
 
 export const updateConfiguration = async (
-  supertest: SuperTest.SuperTest<SuperTest.Test>,
+  supertest: SuperTest.Agent,
   id: string,
   req: ConfigurationPatchRequest,
   expectedHttpCode: number = 200,
   auth: { user: User; space: string | null } | null = { user: superUser, space: null },
-  headers: Record<string, unknown> = {}
+  headers: Record<string, string | string[]> = {}
 ): Promise<Configuration> => {
   const apiCall = supertest.patch(`${getSpaceUrlPrefix(auth?.space)}${CASE_CONFIGURE_URL}/${id}`);
 
diff --git a/x-pack/test/cases_api_integration/common/lib/api/connectors.ts b/x-pack/test/cases_api_integration/common/lib/api/connectors.ts
index 0eb6854cb735d..3bd959b031ae5 100644
--- a/x-pack/test/cases_api_integration/common/lib/api/connectors.ts
+++ b/x-pack/test/cases_api_integration/common/lib/api/connectors.ts
@@ -194,7 +194,7 @@ export const getCaseConnectors = async ({
   expectedHttpCode = 200,
   auth = { user: superUser, space: null },
 }: {
-  supertest: SuperTest.SuperTest<SuperTest.Test>;
+  supertest: SuperTest.Agent;
   expectedHttpCode?: number;
   auth?: { user: User; space: string | null };
 }): Promise<FindActionResult[]> => {
@@ -215,13 +215,13 @@ export const createCaseWithConnector = async ({
   createCaseReq = getPostCaseRequest(),
   headers = {},
 }: {
-  supertest: SuperTest.SuperTest<SuperTest.Test>;
+  supertest: SuperTest.Agent;
   serviceNowSimulatorURL: string;
   actionsRemover: ActionsRemover;
   configureReq?: Record<string, unknown>;
   auth?: { user: User; space: string | null } | null;
   createCaseReq?: CasePostRequest;
-  headers?: Record<string, unknown>;
+  headers?: Record<string, string | string[]>;
 }): Promise<{
   postedCase: Case;
   connector: CreateConnectorResponse;
@@ -288,7 +288,7 @@ export const createConnector = async ({
   expectedHttpCode = 200,
   auth = { user: superUser, space: null },
 }: {
-  supertest: SuperTest.SuperTest<SuperTest.Test>;
+  supertest: SuperTest.Agent;
   req: Record<string, unknown>;
   expectedHttpCode?: number;
   auth?: { user: User; space: string | null };
@@ -309,7 +309,7 @@ export const getConnectors = async ({
   expectedHttpCode = 200,
   auth = { user: superUser, space: null },
 }: {
-  supertest: SuperTest.SuperTest<SuperTest.Test>;
+  supertest: SuperTest.Agent;
   caseId: string;
   expectedHttpCode?: number;
   auth?: { user: User; space: string | null };
@@ -329,7 +329,7 @@ export const executeConnector = async ({
   expectedHttpCode = 200,
   auth = { user: superUser, space: null },
 }: {
-  supertest: SuperTest.SuperTest<SuperTest.Test>;
+  supertest: SuperTest.Agent;
   connectorId: string;
   req: Record<string, unknown>;
   expectedHttpCode?: number;
@@ -352,7 +352,7 @@ export const executeSystemConnector = async ({
   expectedHttpCode = 200,
   auth = { user: superUser, space: null },
 }: {
-  supertest: SuperTest.SuperTest<SuperTest.Test>;
+  supertest: SuperTest.Agent;
   connectorId: string;
   req: Record<string, unknown>;
   expectedHttpCode?: number;
diff --git a/x-pack/test/cases_api_integration/common/lib/api/files.ts b/x-pack/test/cases_api_integration/common/lib/api/files.ts
index 71951564c6a28..8e2710603020f 100644
--- a/x-pack/test/cases_api_integration/common/lib/api/files.ts
+++ b/x-pack/test/cases_api_integration/common/lib/api/files.ts
@@ -23,7 +23,7 @@ export const downloadFile = async ({
   expectedHttpCode = 200,
   auth = { user: superUser, space: null },
 }: {
-  supertest: SuperTest.SuperTest<SuperTest.Test>;
+  supertest: SuperTest.Agent;
   fileId: string;
   kind: string;
   mimeType: string;
@@ -49,7 +49,7 @@ export const deleteFileForFileKind = async ({
   expectedHttpCode = 200,
   auth = { user: superUser, space: null },
 }: {
-  supertest: SuperTest.SuperTest<SuperTest.Test>;
+  supertest: SuperTest.Agent;
   fileKind: string;
   id: string;
   expectedHttpCode?: number;
@@ -72,7 +72,7 @@ export const deleteFiles = async ({
   expectedHttpCode = 200,
   auth = { user: superUser, space: null },
 }: {
-  supertest: SuperTest.SuperTest<SuperTest.Test>;
+  supertest: SuperTest.Agent;
   files: string[];
   expectedHttpCode?: number;
   auth?: { user: User; space: string | null };
@@ -91,7 +91,7 @@ export const deleteAllFilesForKind = async ({
   auth = { user: superUser, space: null },
   expectedHttpCode = 200,
 }: {
-  supertest: SuperTest.SuperTest<SuperTest.Test>;
+  supertest: SuperTest.Agent;
   kind: string;
   expectedHttpCode?: number;
   auth?: { user: User; space: string | null };
@@ -124,7 +124,7 @@ export const deleteAllFiles = async ({
   expectedHttpCode = 200,
   ignoreErrors = true,
 }: {
-  supertest: SuperTest.SuperTest<SuperTest.Test>;
+  supertest: SuperTest.Agent;
   expectedHttpCode?: number;
   auth?: { user: User; space: string | null };
   ignoreErrors?: boolean;
@@ -165,7 +165,7 @@ export const getFileById = async ({
   expectedHttpCode = 200,
   auth = { user: superUser, space: null },
 }: {
-  supertest: SuperTest.SuperTest<SuperTest.Test>;
+  supertest: SuperTest.Agent;
   id: string;
   kind: string;
   expectedHttpCode?: number;
@@ -185,7 +185,7 @@ export const listFiles = async ({
   expectedHttpCode = 200,
   auth = { user: superUser, space: null },
 }: {
-  supertest: SuperTest.SuperTest<SuperTest.Test>;
+  supertest: SuperTest.Agent;
   params: Parameters<BaseFilesClient['list']>[0];
   expectedHttpCode?: number;
   auth?: { user: User; space: string | null };
@@ -213,7 +213,7 @@ export const createFile = async ({
   expectedHttpCode = 200,
   auth = { user: superUser, space: null },
 }: {
-  supertest: SuperTest.SuperTest<SuperTest.Test>;
+  supertest: SuperTest.Agent;
   params: CreateFileSchema;
   expectedHttpCode?: number;
   auth?: { user: User; space: string | null };
@@ -238,7 +238,7 @@ export const uploadFile = async ({
   expectedHttpCode = 200,
   auth = { user: superUser, space: null },
 }: {
-  supertest: SuperTest.SuperTest<SuperTest.Test>;
+  supertest: SuperTest.Agent;
   data: string | object;
   kind: string;
   fileId: string;
@@ -264,7 +264,7 @@ export const createAndUploadFile = async ({
   expectedHttpCode = 200,
   auth = { user: superUser, space: null },
 }: {
-  supertest: SuperTest.SuperTest<SuperTest.Test>;
+  supertest: SuperTest.Agent;
   data: string | object;
   createFileParams: CreateFileSchema;
   expectedHttpCode?: number;
diff --git a/x-pack/test/cases_api_integration/common/lib/api/index.ts b/x-pack/test/cases_api_integration/common/lib/api/index.ts
index 0b7f9c542a6d0..6582601f0f1a9 100644
--- a/x-pack/test/cases_api_integration/common/lib/api/index.ts
+++ b/x-pack/test/cases_api_integration/common/lib/api/index.ts
@@ -129,7 +129,7 @@ export const setStatus = async ({
   supertest,
   cases,
 }: {
-  supertest: SuperTest.SuperTest<SuperTest.Test>;
+  supertest: SuperTest.Agent;
   cases: SetStatusCasesParams[];
 }): Promise<Cases> => {
   const { body }: { body: Cases } = await supertest
@@ -143,7 +143,7 @@ export const setStatus = async ({
 /**
  * Add case as a connector
  */
-export const createCaseAction = async (supertest: SuperTest.SuperTest<SuperTest.Test>) => {
+export const createCaseAction = async (supertest: SuperTest.Agent) => {
   const { body: createdAction } = await supertest
     .post('/api/actions/connector')
     .set('kbn-xsrf', 'foo')
@@ -159,10 +159,7 @@ export const createCaseAction = async (supertest: SuperTest.SuperTest<SuperTest.
 /**
  * Remove a connector
  */
-export const deleteCaseAction = async (
-  supertest: SuperTest.SuperTest<SuperTest.Test>,
-  id: string
-) => {
+export const deleteCaseAction = async (supertest: SuperTest.Agent, id: string) => {
   await supertest.delete(`/api/actions/connector/${id}`).set('kbn-xsrf', 'foo');
 };
 
@@ -418,11 +415,11 @@ export const updateCase = async ({
   auth = { user: superUser, space: null },
   headers = {},
 }: {
-  supertest: SuperTest.SuperTest<SuperTest.Test>;
+  supertest: SuperTest.Agent;
   params: CasesPatchRequest;
   expectedHttpCode?: number;
   auth?: { user: User; space: string | null } | null;
-  headers?: Record<string, unknown>;
+  headers?: Record<string, string | string[]>;
 }): Promise<Case[]> => {
   const apiCall = supertest.patch(`${getSpaceUrlPrefix(auth?.space)}${CASES_URL}`);
 
@@ -444,7 +441,7 @@ export const getAllCasesStatuses = async ({
   auth = { user: superUser, space: null },
   query = {},
 }: {
-  supertest: SuperTest.SuperTest<SuperTest.Test>;
+  supertest: SuperTest.Agent;
   expectedHttpCode?: number;
   auth?: { user: User; space: string | null };
   query?: Record<string, unknown>;
@@ -465,7 +462,7 @@ export const getCase = async ({
   expectedHttpCode = 200,
   auth = { user: superUser, space: null },
 }: {
-  supertest: SuperTest.SuperTest<SuperTest.Test>;
+  supertest: SuperTest.Agent;
   caseId: string;
   includeComments?: boolean;
   expectedHttpCode?: number;
@@ -490,7 +487,7 @@ export const getCaseMetrics = async ({
   expectedHttpCode = 200,
   auth = { user: superUser, space: null },
 }: {
-  supertest: SuperTest.SuperTest<SuperTest.Test>;
+  supertest: SuperTest.Agent;
   caseId: string;
   features: CaseMetricsFeature[] | CaseMetricsFeature;
   expectedHttpCode?: number;
@@ -512,7 +509,7 @@ export const resolveCase = async ({
   expectedHttpCode = 200,
   auth = { user: superUser, space: null },
 }: {
-  supertest: SuperTest.SuperTest<SuperTest.Test>;
+  supertest: SuperTest.Agent;
   caseId: string;
   includeComments?: boolean;
   expectedHttpCode?: number;
@@ -537,7 +534,7 @@ export const findCases = async ({
   expectedHttpCode = 200,
   auth = { user: superUser, space: null },
 }: {
-  supertest: SuperTest.SuperTest<SuperTest.Test>;
+  supertest: SuperTest.Agent;
   query?: Record<string, unknown>;
   expectedHttpCode?: number;
   auth?: { user: User; space: string | null };
@@ -560,7 +557,7 @@ export const getCasesByAlert = async ({
   expectedHttpCode = 200,
   auth = { user: superUser, space: null },
 }: {
-  supertest: SuperTest.SuperTest<SuperTest.Test>;
+  supertest: SuperTest.Agent;
   alertID: string;
   query?: Record<string, unknown>;
   expectedHttpCode?: number;
@@ -581,7 +578,7 @@ export const getTags = async ({
   expectedHttpCode = 200,
   auth = { user: superUser, space: null },
 }: {
-  supertest: SuperTest.SuperTest<SuperTest.Test>;
+  supertest: SuperTest.Agent;
   query?: Record<string, unknown>;
   expectedHttpCode?: number;
   auth?: { user: User; space: string | null };
@@ -602,7 +599,7 @@ export const getReporters = async ({
   expectedHttpCode = 200,
   auth = { user: superUser, space: null },
 }: {
-  supertest: SuperTest.SuperTest<SuperTest.Test>;
+  supertest: SuperTest.Agent;
   query?: Record<string, unknown>;
   expectedHttpCode?: number;
   auth?: { user: User; space: string | null };
@@ -623,7 +620,7 @@ export const getCategories = async ({
   expectedHttpCode = 200,
   auth = { user: superUser, space: null },
 }: {
-  supertest: SuperTest.SuperTest<SuperTest.Test>;
+  supertest: SuperTest.Agent;
   query?: Record<string, unknown>;
   expectedHttpCode?: number;
   auth?: { user: User; space: string | null };
@@ -646,12 +643,12 @@ export const pushCase = async ({
   auth = { user: superUser, space: null },
   headers = {},
 }: {
-  supertest: SuperTest.SuperTest<SuperTest.Test>;
+  supertest: SuperTest.Agent;
   caseId: string;
   connectorId: string;
   expectedHttpCode?: number;
   auth?: { user: User; space: string | null } | null;
-  headers?: Record<string, unknown>;
+  headers?: Record<string, string | string[]>;
 }): Promise<Case> => {
   const apiCall = supertest.post(
     `${getSpaceUrlPrefix(auth?.space)}${CASES_URL}/${caseId}/connector/${connectorId}/_push`
@@ -674,7 +671,7 @@ export const getAlertsAttachedToCase = async ({
   expectedHttpCode = 200,
   auth = { user: superUser, space: null },
 }: {
-  supertest: SuperTest.SuperTest<SuperTest.Test>;
+  supertest: SuperTest.Agent;
   caseId: string;
   expectedHttpCode?: number;
   auth?: { user: User; space: string | null };
@@ -727,7 +724,7 @@ export const getCasesMetrics = async ({
   expectedHttpCode = 200,
   auth = { user: superUser, space: null },
 }: {
-  supertest: SuperTest.SuperTest<SuperTest.Test>;
+  supertest: SuperTest.Agent;
   features: string[] | string;
   query?: Record<string, unknown>;
   expectedHttpCode?: number;
@@ -774,7 +771,7 @@ export const bulkGetCases = async ({
   expectedHttpCode = 200,
   auth = { user: superUser, space: null },
 }: {
-  supertest: SuperTest.SuperTest<SuperTest.Test>;
+  supertest: SuperTest.Agent;
   ids: string[];
   fields?: string[];
   expectedHttpCode?: number;
@@ -796,7 +793,7 @@ export const searchCases = async ({
   expectedHttpCode = 200,
   auth = { user: superUser, space: null },
 }: {
-  supertest: SuperTest.SuperTest<SuperTest.Test>;
+  supertest: SuperTest.Agent;
   body?: Record<string, unknown>;
   expectedHttpCode?: number;
   auth?: { user: User; space: string | null };
@@ -820,13 +817,13 @@ export const replaceCustomField = async ({
   auth = { user: superUser, space: null },
   headers = {},
 }: {
-  supertest: SuperTest.SuperTest<SuperTest.Test>;
+  supertest: SuperTest.Agent;
   caseId: string;
   customFieldId: string;
   params: CustomFieldPutRequest;
   expectedHttpCode?: number;
   auth?: { user: User; space: string | null } | null;
-  headers?: Record<string, unknown>;
+  headers?: Record<string, string | string[]>;
 }): Promise<CaseCustomField> => {
   const apiCall = supertest.put(
     `${getSpaceUrlPrefix(
diff --git a/x-pack/test/cases_api_integration/common/lib/api/user_actions.ts b/x-pack/test/cases_api_integration/common/lib/api/user_actions.ts
index fc4f8382d3508..4a0f38b5dcc90 100644
--- a/x-pack/test/cases_api_integration/common/lib/api/user_actions.ts
+++ b/x-pack/test/cases_api_integration/common/lib/api/user_actions.ts
@@ -42,7 +42,7 @@ export const getCaseUserActions = async ({
   expectedHttpCode = 200,
   auth = { user: superUser, space: null },
 }: {
-  supertest: SuperTest.SuperTest<SuperTest.Test>;
+  supertest: SuperTest.Agent;
   caseID: string;
   expectedHttpCode?: number;
   auth?: { user: User; space: string | null };
@@ -61,7 +61,7 @@ export const findCaseUserActions = async ({
   expectedHttpCode = 200,
   auth = { user: superUser, space: null },
 }: {
-  supertest: SuperTest.SuperTest<SuperTest.Test>;
+  supertest: SuperTest.Agent;
   caseID: string;
   options?: UserActionFindRequest;
   expectedHttpCode?: number;
@@ -82,7 +82,7 @@ export const getCaseUserActionStats = async ({
   expectedHttpCode = 200,
   auth = { user: superUser, space: null },
 }: {
-  supertest: SuperTest.SuperTest<SuperTest.Test>;
+  supertest: SuperTest.Agent;
   caseID: string;
   expectedHttpCode?: number;
   auth?: { user: User; space: string | null };
@@ -101,7 +101,7 @@ export const getCaseUsers = async ({
   expectedHttpCode = 200,
   auth = { user: superUser, space: null },
 }: {
-  supertest: SuperTest.SuperTest<SuperTest.Test>;
+  supertest: SuperTest.Agent;
   caseId: string;
   expectedHttpCode?: number;
   auth?: { user: User; space: string | null };
diff --git a/x-pack/test/cases_api_integration/common/lib/api/user_profiles.ts b/x-pack/test/cases_api_integration/common/lib/api/user_profiles.ts
index bc78feab4070c..f9a66fe0f7962 100644
--- a/x-pack/test/cases_api_integration/common/lib/api/user_profiles.ts
+++ b/x-pack/test/cases_api_integration/common/lib/api/user_profiles.ts
@@ -38,7 +38,7 @@ export const bulkGetUserProfiles = async <T extends string>({
   expectedHttpCode = 200,
   auth = { user: superUser, space: null },
 }: {
-  supertest: SuperTest.SuperTest<SuperTest.Test>;
+  supertest: SuperTest.Agent;
   req: BulkGetUserProfilesParams<T>;
   expectedHttpCode?: number;
   auth?: { user: User; space: string | null };
@@ -62,7 +62,7 @@ export const suggestUserProfiles = async ({
   expectedHttpCode = 200,
   auth = { user: superUser, space: null },
 }: {
-  supertest: SuperTest.SuperTest<SuperTest.Test>;
+  supertest: SuperTest.Agent;
   req: SuggestUserProfilesRequest;
   expectedHttpCode?: number;
   auth?: { user: User; space: string | null };
@@ -89,10 +89,10 @@ export const updateUserProfileAvatar = async ({
   expectedHttpCode = 200,
   headers = {},
 }: {
-  supertest: SuperTest.SuperTest<SuperTest.Test>;
+  supertest: SuperTest.Agent;
   req: UserProfileAvatarData;
   expectedHttpCode?: number;
-  headers?: Record<string, unknown>;
+  headers?: Record<string, string | string[]>;
 }): Promise<void> => {
   await supertest
     .post('/internal/security/user_profile/_data')
@@ -106,7 +106,7 @@ export const loginUsers = async ({
   supertest,
   users = [superUser],
 }: {
-  supertest: SuperTest.SuperTest<SuperTest.Test>;
+  supertest: SuperTest.Agent;
   users?: User[];
 }) => {
   const cookies: Cookie[] = [];
diff --git a/x-pack/test/cases_api_integration/security_and_spaces/tests/common/cases/bulk_create_cases.ts b/x-pack/test/cases_api_integration/security_and_spaces/tests/common/cases/bulk_create_cases.ts
index 8177649f22ab3..c07d858e4b389 100644
--- a/x-pack/test/cases_api_integration/security_and_spaces/tests/common/cases/bulk_create_cases.ts
+++ b/x-pack/test/cases_api_integration/security_and_spaces/tests/common/cases/bulk_create_cases.ts
@@ -52,7 +52,7 @@ export default ({ getService }: FtrProviderContext): void => {
       expectedHttpCode = 200,
       auth = { user: superUser, space: null },
     }: {
-      superTestService?: SuperTest.SuperTest<SuperTest.Test>;
+      superTestService?: SuperTest.Agent;
       data: object;
       expectedHttpCode?: number;
       auth?: { user: User; space: string | null };
diff --git a/x-pack/test/cases_api_integration/security_and_spaces/tests/common/cases/delete_cases.ts b/x-pack/test/cases_api_integration/security_and_spaces/tests/common/cases/delete_cases.ts
index 4c3239fe0d126..ef0e09f1a477d 100644
--- a/x-pack/test/cases_api_integration/security_and_spaces/tests/common/cases/delete_cases.ts
+++ b/x-pack/test/cases_api_integration/security_and_spaces/tests/common/cases/delete_cases.ts
@@ -700,7 +700,7 @@ const createCaseWithFiles = async ({
   owner,
   auth = { user: superUser, space: null },
 }: {
-  supertest: SuperTest.SuperTest<SuperTest.Test>;
+  supertest: SuperTest.Agent;
   fileKind: string;
   owner: string;
   auth?: { user: User; space: string | null };
diff --git a/x-pack/test/cases_api_integration/security_and_spaces/tests/common/cases/import_export.ts b/x-pack/test/cases_api_integration/security_and_spaces/tests/common/cases/import_export.ts
index 060b6463c0451..3aa11c83947ad 100644
--- a/x-pack/test/cases_api_integration/security_and_spaces/tests/common/cases/import_export.ts
+++ b/x-pack/test/cases_api_integration/security_and_spaces/tests/common/cases/import_export.ts
@@ -161,7 +161,7 @@ export default ({ getService }: FtrProviderContext): void => {
   });
 };
 
-const expectImportToHaveOneCase = async (supertestService: supertest.SuperTest<supertest.Test>) => {
+const expectImportToHaveOneCase = async (supertestService: supertest.Agent) => {
   const findResponse = await findCases({ supertest: supertestService, query: {} });
   expect(findResponse.total).to.eql(1);
   expect(findResponse.cases[0].title).to.eql('A case with a connector');
diff --git a/x-pack/test/cases_api_integration/security_and_spaces/tests/trial/connectors/cases/cases_connector.ts b/x-pack/test/cases_api_integration/security_and_spaces/tests/trial/connectors/cases/cases_connector.ts
index b0fcd30fa5a42..060222473c15b 100644
--- a/x-pack/test/cases_api_integration/security_and_spaces/tests/trial/connectors/cases/cases_connector.ts
+++ b/x-pack/test/cases_api_integration/security_and_spaces/tests/trial/connectors/cases/cases_connector.ts
@@ -1352,7 +1352,7 @@ const executeConnectorAndVerifyCorrectness = async ({
   connectorId,
   req,
 }: {
-  supertest: SuperTest.SuperTest<SuperTest.Test>;
+  supertest: SuperTest.Agent;
   connectorId: string;
   req: Record<string, unknown>;
 }) => {
diff --git a/x-pack/test/common/services/bsearch_secure.ts b/x-pack/test/common/services/bsearch_secure.ts
index 0ab967462767f..01050d1bb60c0 100644
--- a/x-pack/test/common/services/bsearch_secure.ts
+++ b/x-pack/test/common/services/bsearch_secure.ts
@@ -28,7 +28,7 @@ const getSpaceUrlPrefix = (spaceId?: string): string => {
 };
 
 interface SendOptions {
-  supertestWithoutAuth: SuperTest.SuperTest<SuperTest.Test>;
+  supertestWithoutAuth: SuperTest.Agent;
   auth: { username: string; password: string };
   referer?: string;
   kibanaVersion?: string;
diff --git a/x-pack/test/common/utils/security_solution/detections_response/alerts/create_alerts_index.ts b/x-pack/test/common/utils/security_solution/detections_response/alerts/create_alerts_index.ts
index 932db176942d9..da7f7b2cf36a6 100644
--- a/x-pack/test/common/utils/security_solution/detections_response/alerts/create_alerts_index.ts
+++ b/x-pack/test/common/utils/security_solution/detections_response/alerts/create_alerts_index.ts
@@ -17,7 +17,7 @@ import { countDownTest } from '../count_down_test';
  * @param supertest The supertest client library
  */
 export const createAlertsIndex = async (
-  supertest: SuperTest.SuperTest<SuperTest.Test>,
+  supertest: SuperTest.Agent,
   log: ToolingLog
 ): Promise<void> => {
   await countDownTest(
diff --git a/x-pack/test/common/utils/security_solution/detections_response/alerts/delete_all_alerts.ts b/x-pack/test/common/utils/security_solution/detections_response/alerts/delete_all_alerts.ts
index e15aa4453282a..f29237b237694 100644
--- a/x-pack/test/common/utils/security_solution/detections_response/alerts/delete_all_alerts.ts
+++ b/x-pack/test/common/utils/security_solution/detections_response/alerts/delete_all_alerts.ts
@@ -16,7 +16,7 @@ import { countDownTest } from '../count_down_test';
  * For use inside of afterEach blocks of tests
  */
 export const deleteAllAlerts = async (
-  supertest: SuperTest.SuperTest<SuperTest.Test>,
+  supertest: SuperTest.Agent,
   log: ToolingLog,
   es: Client,
   index: Array<'.alerts-security.alerts-*' | '.preview.alerts-security.alerts-*'> = [
diff --git a/x-pack/test/common/utils/security_solution/detections_response/alerts/get_alerts_by_id.ts b/x-pack/test/common/utils/security_solution/detections_response/alerts/get_alerts_by_id.ts
index 1a3f7e29c26c6..92791edd5ea7e 100644
--- a/x-pack/test/common/utils/security_solution/detections_response/alerts/get_alerts_by_id.ts
+++ b/x-pack/test/common/utils/security_solution/detections_response/alerts/get_alerts_by_id.ts
@@ -20,7 +20,7 @@ import { getQueryAlertsId } from './get_query_alerts_ids';
  * @param ids Rule id
  */
 export const getAlertsById = async (
-  supertest: SuperTest.SuperTest<SuperTest.Test>,
+  supertest: SuperTest.Agent,
   log: ToolingLog,
   id: string
 ): Promise<SearchResponse<DetectionAlert>> => {
diff --git a/x-pack/test/common/utils/security_solution/detections_response/alerts/get_alerts_by_ids.ts b/x-pack/test/common/utils/security_solution/detections_response/alerts/get_alerts_by_ids.ts
index 1cfc922d76677..d090a39ff3779 100644
--- a/x-pack/test/common/utils/security_solution/detections_response/alerts/get_alerts_by_ids.ts
+++ b/x-pack/test/common/utils/security_solution/detections_response/alerts/get_alerts_by_ids.ts
@@ -23,7 +23,7 @@ import { routeWithNamespace } from '../route_with_namespace';
  * @param ids Array of the rule ids
  */
 export const getAlertsByIds = async (
-  supertest: SuperTest.SuperTest<SuperTest.Test>,
+  supertest: SuperTest.Agent,
   log: ToolingLog,
   ids: string[],
   size?: number,
diff --git a/x-pack/test/common/utils/security_solution/detections_response/alerts/wait_for_alerts_to_be_present.ts b/x-pack/test/common/utils/security_solution/detections_response/alerts/wait_for_alerts_to_be_present.ts
index f7e873f98d4c7..5772861f6e636 100644
--- a/x-pack/test/common/utils/security_solution/detections_response/alerts/wait_for_alerts_to_be_present.ts
+++ b/x-pack/test/common/utils/security_solution/detections_response/alerts/wait_for_alerts_to_be_present.ts
@@ -18,7 +18,7 @@ import { waitFor } from '../wait_for';
  * @param numberOfAlerts The number of alerts to wait for, default is 1
  */
 export const waitForAlertsToBePresent = async (
-  supertest: SuperTest.SuperTest<SuperTest.Test>,
+  supertest: SuperTest.Agent,
   log: ToolingLog,
   numberOfAlerts = 1,
   alertIds: string[],
diff --git a/x-pack/test/common/utils/security_solution/detections_response/rules/create_rule.ts b/x-pack/test/common/utils/security_solution/detections_response/rules/create_rule.ts
index ac6e44b2aab83..b1fe58770abfd 100644
--- a/x-pack/test/common/utils/security_solution/detections_response/rules/create_rule.ts
+++ b/x-pack/test/common/utils/security_solution/detections_response/rules/create_rule.ts
@@ -27,7 +27,7 @@ import { routeWithNamespace } from '../route_with_namespace';
  * @param rule The rule to create
  */
 export const createRule = async (
-  supertest: SuperTest.SuperTest<SuperTest.Test>,
+  supertest: SuperTest.Agent,
   log: ToolingLog,
   rule: RuleCreateProps,
   namespace?: string
diff --git a/x-pack/test/common/utils/security_solution/detections_response/rules/delete_all_rules.ts b/x-pack/test/common/utils/security_solution/detections_response/rules/delete_all_rules.ts
index 8fe87827e4e25..66bf65ccfbc20 100644
--- a/x-pack/test/common/utils/security_solution/detections_response/rules/delete_all_rules.ts
+++ b/x-pack/test/common/utils/security_solution/detections_response/rules/delete_all_rules.ts
@@ -19,7 +19,7 @@ import { countDownTest } from '../count_down_test';
  * @param supertest The supertest agent.
  */
 export const deleteAllRules = async (
-  supertest: SuperTest.SuperTest<SuperTest.Test>,
+  supertest: SuperTest.Agent,
   log: ToolingLog
 ): Promise<void> => {
   await countDownTest(
diff --git a/x-pack/test/common/utils/security_solution/detections_response/rules/delete_rule.ts b/x-pack/test/common/utils/security_solution/detections_response/rules/delete_rule.ts
index f4eff397aba0b..5b3e28f05e093 100644
--- a/x-pack/test/common/utils/security_solution/detections_response/rules/delete_rule.ts
+++ b/x-pack/test/common/utils/security_solution/detections_response/rules/delete_rule.ts
@@ -17,7 +17,7 @@ import { DETECTION_ENGINE_RULES_URL } from '@kbn/security-solution-plugin/common
  * @param ruleId The rule id to delete
  */
 export const deleteRule = async (
-  supertest: SuperTest.SuperTest<SuperTest.Test>,
+  supertest: SuperTest.Agent,
   ruleId: string
 ): Promise<RuleResponse> => {
   const response = await supertest
diff --git a/x-pack/test/common/utils/security_solution/detections_response/rules/wait_for_rule_status.ts b/x-pack/test/common/utils/security_solution/detections_response/rules/wait_for_rule_status.ts
index af0838b29613d..975b8dbef3b72 100644
--- a/x-pack/test/common/utils/security_solution/detections_response/rules/wait_for_rule_status.ts
+++ b/x-pack/test/common/utils/security_solution/detections_response/rules/wait_for_rule_status.ts
@@ -16,7 +16,7 @@ import { waitFor } from '../wait_for';
 import { routeWithNamespace } from '../route_with_namespace';
 
 interface WaitForRuleStatusBaseParams {
-  supertest: SuperTest.SuperTest<SuperTest.Test>;
+  supertest: SuperTest.Agent;
   log: ToolingLog;
   afterDate?: Date;
   namespace?: string;
diff --git a/x-pack/test/dataset_quality_api_integration/common/dataset_quality_api_supertest.ts b/x-pack/test/dataset_quality_api_integration/common/dataset_quality_api_supertest.ts
index 79818e970a2ab..66823c794b017 100644
--- a/x-pack/test/dataset_quality_api_integration/common/dataset_quality_api_supertest.ts
+++ b/x-pack/test/dataset_quality_api_integration/common/dataset_quality_api_supertest.ts
@@ -12,7 +12,7 @@ import type { APIEndpoint } from '@kbn/dataset-quality-plugin/server/routes';
 import { formatRequest } from '@kbn/server-route-repository';
 import type { APIClientRequestParamsOf, APIReturnType } from '@kbn/dataset-quality-plugin/common';
 
-export function createDatasetQualityApiClient(st: supertest.SuperTest<supertest.Test>) {
+export function createDatasetQualityApiClient(st: supertest.Agent) {
   return async <TEndpoint extends APIEndpoint>(
     options: {
       type?: 'form-data';
diff --git a/x-pack/test/dataset_quality_api_integration/tests/integrations/package_utils.ts b/x-pack/test/dataset_quality_api_integration/tests/integrations/package_utils.ts
index 4aa403ee6d62a..ae2b9a01fa475 100644
--- a/x-pack/test/dataset_quality_api_integration/tests/integrations/package_utils.ts
+++ b/x-pack/test/dataset_quality_api_integration/tests/integrations/package_utils.ts
@@ -5,7 +5,7 @@
  * 2.0.
  */
 
-import { SuperTest, Test } from 'supertest';
+import { Agent as SuperTestAgent } from 'supertest';
 
 export interface IntegrationPackage {
   name: string;
@@ -26,7 +26,7 @@ export async function installCustomIntegration({
   supertest,
   customIntegration,
 }: {
-  supertest: SuperTest<Test>;
+  supertest: SuperTestAgent;
   customIntegration: CustomIntegration;
 }) {
   const { integrationName, datasets } = customIntegration;
@@ -41,7 +41,7 @@ export async function installPackage({
   supertest,
   pkg,
 }: {
-  supertest: SuperTest<Test>;
+  supertest: SuperTestAgent;
   pkg: IntegrationPackage;
 }) {
   const { name, version } = pkg;
@@ -56,7 +56,7 @@ export async function uninstallPackage({
   supertest,
   pkg,
 }: {
-  supertest: SuperTest<Test>;
+  supertest: SuperTestAgent;
   pkg: IntegrationPackage;
 }) {
   const { name, version } = pkg;
diff --git a/x-pack/test/fleet_api_integration/apis/epm/install_by_upload.ts b/x-pack/test/fleet_api_integration/apis/epm/install_by_upload.ts
index f086ad8785d8d..6fe31c67c65a2 100644
--- a/x-pack/test/fleet_api_integration/apis/epm/install_by_upload.ts
+++ b/x-pack/test/fleet_api_integration/apis/epm/install_by_upload.ts
@@ -9,6 +9,7 @@ import fs from 'fs';
 import path from 'path';
 import expect from '@kbn/expect';
 import { INGEST_SAVED_OBJECT_INDEX } from '@kbn/core-saved-objects-server';
+import { HTTPError } from 'superagent';
 
 import { FtrProviderContext } from '../../../api_integration/ftr_provider_context';
 import { skipIfNoDockerRegistry } from '../../helpers';
@@ -167,7 +168,7 @@ export default function (providerContext: FtrProviderContext) {
         .type('application/gzip')
         .send(buf)
         .expect(400);
-      expect(res.error.text).to.equal(
+      expect((res.error as HTTPError).text).to.equal(
         '{"statusCode":400,"error":"Bad Request","message":"Archive seems empty. Assumed content type was application/gzip, check if this matches the archive type."}'
       );
     });
@@ -180,7 +181,7 @@ export default function (providerContext: FtrProviderContext) {
         .type('application/zip')
         .send(buf)
         .expect(400);
-      expect(res.error.text).to.equal(
+      expect((res.error as HTTPError).text).to.equal(
         '{"statusCode":400,"error":"Bad Request","message":"Error during extraction of package: Error: end of central directory record signature not found. Assumed content type was application/zip, check if this matches the archive type."}'
       );
     });
@@ -193,7 +194,7 @@ export default function (providerContext: FtrProviderContext) {
         .type('application/zip')
         .send(buf)
         .expect(400);
-      expect(res.error.text).to.equal(
+      expect((res.error as HTTPError).text).to.equal(
         '{"statusCode":400,"error":"Bad Request","message":"Package contains more than one top-level directory; top-level directory found: apache-0.1.4; filePath: apache-0.1.3/manifest.yml"}'
       );
     });
@@ -206,7 +207,7 @@ export default function (providerContext: FtrProviderContext) {
         .type('application/zip')
         .send(buf)
         .expect(400);
-      expect(res.error.text).to.equal(
+      expect((res.error as HTTPError).text).to.equal(
         '{"statusCode":400,"error":"Bad Request","message":"Manifest file apache-0.1.4/manifest.yml not found in paths."}'
       );
     });
@@ -219,7 +220,7 @@ export default function (providerContext: FtrProviderContext) {
         .type('application/zip')
         .send(buf)
         .expect(400);
-      expect(res.error.text).to.equal(
+      expect((res.error as HTTPError).text).to.equal(
         '{"statusCode":400,"error":"Bad Request","message":"Could not parse top-level package manifest at top-level directory apache-0.1.4: YAMLException: bad indentation of a mapping entry at line 2, column 7:\\n      name: apache\\n          ^."}'
       );
     });
@@ -232,7 +233,7 @@ export default function (providerContext: FtrProviderContext) {
         .type('application/zip')
         .send(buf)
         .expect(400);
-      expect(res.error.text).to.equal(
+      expect((res.error as HTTPError).text).to.equal(
         '{"statusCode":400,"error":"Bad Request","message":"Invalid top-level package manifest at top-level directory apache-0.1.4 (package name: apache): one or more fields missing of name, version, description, title, format_version, owner."}'
       );
     });
@@ -245,7 +246,7 @@ export default function (providerContext: FtrProviderContext) {
         .type('application/zip')
         .send(buf)
         .expect(400);
-      expect(res.error.text).to.equal(
+      expect((res.error as HTTPError).text).to.equal(
         '{"statusCode":400,"error":"Bad Request","message":"Name thisIsATypo and version 0.1.4 do not match top-level directory apache-0.1.4"}'
       );
     });
diff --git a/x-pack/test/fleet_api_integration/helpers.ts b/x-pack/test/fleet_api_integration/helpers.ts
index bf8729dba368b..2d9febe190892 100644
--- a/x-pack/test/fleet_api_integration/helpers.ts
+++ b/x-pack/test/fleet_api_integration/helpers.ts
@@ -15,7 +15,7 @@ import {
 } from '@kbn/fleet-plugin/common';
 import { KbnClient } from '@kbn/test';
 import { UNINSTALL_TOKENS_SAVED_OBJECT_TYPE } from '@kbn/fleet-plugin/common';
-import { SuperTest, Test } from 'supertest';
+import { Agent as SuperTestAgent } from 'supertest';
 import { FtrProviderContext } from '../api_integration/ftr_provider_context';
 
 export function warnAndSkipTest(mochaContext: Mocha.Context, log: ToolingLog) {
@@ -109,7 +109,7 @@ export async function generateAgent(
   });
 }
 
-export function setPrereleaseSetting(supertest: SuperTest<Test>) {
+export function setPrereleaseSetting(supertest: SuperTestAgent) {
   before(async () => {
     await supertest
       .put('/api/fleet/settings')
@@ -126,7 +126,7 @@ export function setPrereleaseSetting(supertest: SuperTest<Test>) {
 }
 
 export const generateNAgentPolicies = async (
-  supertest: SuperTest<Test>,
+  supertest: SuperTestAgent,
   number: number,
   overwrite?: Partial<CreateAgentPolicyRequest['body']>
 ): Promise<AgentPolicy[]> => {
@@ -142,7 +142,7 @@ export const generateNAgentPolicies = async (
 };
 
 export const generateAgentPolicy = async (
-  supertest: SuperTest<Test>,
+  supertest: SuperTestAgent,
   overwrite?: Partial<CreateAgentPolicyRequest['body']>
 ): Promise<AgentPolicy> => {
   const response = await supertest
diff --git a/x-pack/test/functional/services/transform/api.ts b/x-pack/test/functional/services/transform/api.ts
index 5aad29fff8942..15751c91253ec 100644
--- a/x-pack/test/functional/services/transform/api.ts
+++ b/x-pack/test/functional/services/transform/api.ts
@@ -237,7 +237,7 @@ export function TransformAPIProvider({ getService }: FtrProviderContext) {
         );
         const { body, status } = await esSupertest
           .put(`/_transform/${transformId}${deferValidation ? '?defer_validation=true' : ''}`)
-          .set(headers)
+          .set(headers as Record<string, string>)
           .send(transformConfig);
         this.assertResponseStatusCode(200, status, body);
       } else {
diff --git a/x-pack/test/functional_with_es_ssl/apps/cases/group2/attachment_framework.ts b/x-pack/test/functional_with_es_ssl/apps/cases/group2/attachment_framework.ts
index c45df81316e81..876e4d2123019 100644
--- a/x-pack/test/functional_with_es_ssl/apps/cases/group2/attachment_framework.ts
+++ b/x-pack/test/functional_with_es_ssl/apps/cases/group2/attachment_framework.ts
@@ -24,7 +24,7 @@ import {
 import { FtrProviderContext } from '../../../ftr_provider_context';
 
 const createLogStashDataView = async (
-  supertest: SuperTest.SuperTest<SuperTest.Test>
+  supertest: SuperTest.Agent
 ): Promise<{ data_view: { id: string } }> => {
   const { body } = await supertest
     .post(`/api/data_views/data_view`)
@@ -36,7 +36,7 @@ const createLogStashDataView = async (
 };
 
 const deleteLogStashDataView = async (
-  supertest: SuperTest.SuperTest<SuperTest.Test>,
+  supertest: SuperTest.Agent,
   dataViewId: string
 ): Promise<void> => {
   await supertest
diff --git a/x-pack/test/functional_with_es_ssl/apps/triggers_actions_ui/connectors/utils.ts b/x-pack/test/functional_with_es_ssl/apps/triggers_actions_ui/connectors/utils.ts
index 09dffef846cd5..e96ec17eb9c2e 100644
--- a/x-pack/test/functional_with_es_ssl/apps/triggers_actions_ui/connectors/utils.ts
+++ b/x-pack/test/functional_with_es_ssl/apps/triggers_actions_ui/connectors/utils.ts
@@ -48,10 +48,7 @@ export const createSlackConnector = async ({
   return connector;
 };
 
-export const getConnectorByName = async (
-  name: string,
-  supertest: SuperTest.SuperTest<SuperTest.Test>
-) => {
+export const getConnectorByName = async (name: string, supertest: SuperTest.Agent) => {
   const { body } = await supertest
     .get(`/api/actions/connectors`)
     .set('kbn-xsrf', 'foo')
@@ -65,7 +62,7 @@ export async function createRuleWithActionsAndParams(
   testRunUuid: string,
   params: Record<string, any> = {},
   overwrites: Record<string, any> = {},
-  supertest: SuperTest.SuperTest<SuperTest.Test>
+  supertest: SuperTest.Agent
 ) {
   return await createAlwaysFiringRule(
     {
@@ -94,7 +91,7 @@ export async function createRuleWithActionsAndParams(
 
 async function createAlwaysFiringRule(
   overwrites: Record<string, any> = {},
-  supertest: SuperTest.SuperTest<SuperTest.Test>
+  supertest: SuperTest.Agent
 ) {
   const { body: createdRule } = await supertest
     .post(`/api/alerting/rule`)
@@ -109,10 +106,7 @@ async function createAlwaysFiringRule(
   return createdRule;
 }
 
-export async function getAlertSummary(
-  ruleId: string,
-  supertest: SuperTest.SuperTest<SuperTest.Test>
-) {
+export async function getAlertSummary(ruleId: string, supertest: SuperTest.Agent) {
   const { body: summary } = await supertest
     .get(`/internal/alerting/rule/${encodeURIComponent(ruleId)}/_alert_summary`)
     .expect(200);
diff --git a/x-pack/test/monitoring_api_integration/packages.ts b/x-pack/test/monitoring_api_integration/packages.ts
index 284bba089a55c..981845eb460dc 100644
--- a/x-pack/test/monitoring_api_integration/packages.ts
+++ b/x-pack/test/monitoring_api_integration/packages.ts
@@ -30,10 +30,7 @@ export const getPackagesArgs = (): string[] => {
 
 export const bundledPackagesLocation = path.join(path.dirname(__filename), '/fixtures/packages');
 
-export function installPackage(
-  supertest: SuperTest.SuperTest<SuperTest.Test>,
-  packageName: SupportedPackage
-) {
+export function installPackage(supertest: SuperTest.Agent, packageName: SupportedPackage) {
   const pkg = PACKAGES.find(({ name }) => name === packageName);
   const request = supertest
     .post('/api/fleet/epm/packages')
diff --git a/x-pack/test/observability_ai_assistant_api_integration/common/observability_ai_assistant_api_client.ts b/x-pack/test/observability_ai_assistant_api_integration/common/observability_ai_assistant_api_client.ts
index cb59adca9a86a..865620a2d028a 100644
--- a/x-pack/test/observability_ai_assistant_api_integration/common/observability_ai_assistant_api_client.ts
+++ b/x-pack/test/observability_ai_assistant_api_integration/common/observability_ai_assistant_api_client.ts
@@ -15,7 +15,7 @@ import supertest from 'supertest';
 import { format } from 'url';
 import { Subtract } from 'utility-types';
 
-export function createObservabilityAIAssistantApiClient(st: supertest.SuperTest<supertest.Test>) {
+export function createObservabilityAIAssistantApiClient(st: supertest.Agent) {
   return <TEndpoint extends ObservabilityAIAssistantAPIEndpoint>(
     options: {
       type?: 'form-data';
@@ -70,17 +70,62 @@ type WithoutPromise<T extends Promise<any>> = Subtract<T, Promise<any>>;
 //  end(one:string)
 //  end(one:string, two:string)
 // }
-// would lose the first signature. This keeps up to four signatures.
+// would lose the first signature. This keeps up to eight signatures.
 type OverloadedParameters<T> = T extends {
   (...args: infer A1): any;
   (...args: infer A2): any;
   (...args: infer A3): any;
   (...args: infer A4): any;
+  (...args: infer A5): any;
+  (...args: infer A6): any;
+  (...args: infer A7): any;
+  (...args: infer A8): any;
 }
+  ? A1 | A2 | A3 | A4 | A5 | A6 | A7 | A8
+  : T extends {
+      (...args: infer A1): any;
+      (...args: infer A2): any;
+      (...args: infer A3): any;
+      (...args: infer A4): any;
+      (...args: infer A5): any;
+      (...args: infer A6): any;
+      (...args: infer A7): any;
+    }
+  ? A1 | A2 | A3 | A4 | A5 | A6 | A7
+  : T extends {
+      (...args: infer A1): any;
+      (...args: infer A2): any;
+      (...args: infer A3): any;
+      (...args: infer A4): any;
+      (...args: infer A5): any;
+      (...args: infer A6): any;
+    }
+  ? A1 | A2 | A3 | A4 | A5 | A6
+  : T extends {
+      (...args: infer A1): any;
+      (...args: infer A2): any;
+      (...args: infer A3): any;
+      (...args: infer A4): any;
+      (...args: infer A5): any;
+    }
+  ? A1 | A2 | A3 | A4 | A5
+  : T extends {
+      (...args: infer A1): any;
+      (...args: infer A2): any;
+      (...args: infer A3): any;
+      (...args: infer A4): any;
+    }
   ? A1 | A2 | A3 | A4
-  : T extends { (...args: infer A1): any; (...args: infer A2): any; (...args: infer A3): any }
+  : T extends {
+      (...args: infer A1): any;
+      (...args: infer A2): any;
+      (...args: infer A3): any;
+    }
   ? A1 | A2 | A3
-  : T extends { (...args: infer A1): any; (...args: infer A2): any }
+  : T extends {
+      (...args: infer A1): any;
+      (...args: infer A2): any;
+    }
   ? A1 | A2
   : T extends (...args: infer A) => any
   ? A
diff --git a/x-pack/test/observability_ai_assistant_api_integration/tests/connectors/connectors.spec.ts b/x-pack/test/observability_ai_assistant_api_integration/tests/connectors/connectors.spec.ts
index d5e726012c869..d51edffc9a1a8 100644
--- a/x-pack/test/observability_ai_assistant_api_integration/tests/connectors/connectors.spec.ts
+++ b/x-pack/test/observability_ai_assistant_api_integration/tests/connectors/connectors.spec.ts
@@ -6,7 +6,7 @@
  */
 
 import expect from '@kbn/expect';
-import type { SuperTest, Test } from 'supertest';
+import type { Agent as SuperTestAgent } from 'supertest';
 import { FtrProviderContext } from '../../common/ftr_provider_context';
 
 export default function ApiTest({ getService }: FtrProviderContext) {
@@ -71,7 +71,7 @@ export default function ApiTest({ getService }: FtrProviderContext) {
   });
 }
 
-export async function deleteAllActionConnectors(supertest: SuperTest<Test>): Promise<any> {
+export async function deleteAllActionConnectors(supertest: SuperTestAgent): Promise<any> {
   const res = await supertest.get(`/api/actions/connectors`);
 
   const body = res.body as Array<{ id: string; connector_type_id: string; name: string }>;
diff --git a/x-pack/test/observability_api_integration/common/obs_api_supertest.ts b/x-pack/test/observability_api_integration/common/obs_api_supertest.ts
index e0788dcd6785d..69d7083f838e4 100644
--- a/x-pack/test/observability_api_integration/common/obs_api_supertest.ts
+++ b/x-pack/test/observability_api_integration/common/obs_api_supertest.ts
@@ -24,7 +24,7 @@ export type APIClientRequestParamsOf<TEndpoint extends APIEndpoint> = ClientRequ
   TEndpoint
 >;
 
-export function createObsApiClient(st: supertest.SuperTest<supertest.Test>) {
+export function createObsApiClient(st: supertest.Agent) {
   return async <TEndpoint extends APIEndpoint>(
     options: {
       type?: 'form-data';
diff --git a/x-pack/test/observability_onboarding_api_integration/common/observability_onboarding_api_supertest.ts b/x-pack/test/observability_onboarding_api_integration/common/observability_onboarding_api_supertest.ts
index c679c91e96525..199230e92c4ae 100644
--- a/x-pack/test/observability_onboarding_api_integration/common/observability_onboarding_api_supertest.ts
+++ b/x-pack/test/observability_onboarding_api_integration/common/observability_onboarding_api_supertest.ts
@@ -15,7 +15,7 @@ import type {
 import type { APIEndpoint } from '@kbn/observability-onboarding-plugin/server/routes';
 import { formatRequest } from '@kbn/server-route-repository';
 
-export function createObservabilityOnboardingApiClient(st: supertest.SuperTest<supertest.Test>) {
+export function createObservabilityOnboardingApiClient(st: supertest.Agent) {
   return async <TEndpoint extends APIEndpoint>(
     options: {
       type?: 'form-data';
diff --git a/x-pack/test/profiling_api_integration/common/api_supertest.ts b/x-pack/test/profiling_api_integration/common/api_supertest.ts
index 11d7564248caf..dcd5c892d3b77 100644
--- a/x-pack/test/profiling_api_integration/common/api_supertest.ts
+++ b/x-pack/test/profiling_api_integration/common/api_supertest.ts
@@ -10,7 +10,7 @@ import request from 'superagent';
 import supertest from 'supertest';
 import { format } from 'url';
 
-export function createProfilingApiClient(st: supertest.SuperTest<supertest.Test>) {
+export function createProfilingApiClient(st: supertest.Agent) {
   return async (options: {
     endpoint: string;
     params?: {
diff --git a/x-pack/test/profiling_api_integration/common/bettertest.ts b/x-pack/test/profiling_api_integration/common/bettertest.ts
index ca679a24539ac..ec2fd13763853 100644
--- a/x-pack/test/profiling_api_integration/common/bettertest.ts
+++ b/x-pack/test/profiling_api_integration/common/bettertest.ts
@@ -23,7 +23,7 @@ export type BetterTest = <T extends any>(options: {
  * This is useful for tests that expect a 200 response
  * It also makes it easier to debug tests that fail because of a 500 response.
  */
-export function getBettertest(st: supertest.SuperTest<supertest.Test>): BetterTest {
+export function getBettertest(st: supertest.Agent): BetterTest {
   return async ({ pathname, method = 'get', query, body }) => {
     const url = format({ pathname, query });
 
@@ -60,7 +60,7 @@ export class BetterTestError extends Error {
     const req = res.req as any;
     super(
       `Unhandled BetterTestError:
-Status: "${res.status}"      
+Status: "${res.status}"
 Path: "${req.method} ${req.path}"
 Body: ${JSON.stringify(res.body)}`
     );
diff --git a/x-pack/test/saved_object_api_integration/common/lib/create_users_and_roles.ts b/x-pack/test/saved_object_api_integration/common/lib/create_users_and_roles.ts
index e0fed03efb94d..eb7a729ff5c96 100644
--- a/x-pack/test/saved_object_api_integration/common/lib/create_users_and_roles.ts
+++ b/x-pack/test/saved_object_api_integration/common/lib/create_users_and_roles.ts
@@ -5,11 +5,11 @@
  * 2.0.
  */
 
-import type { SuperTest } from 'supertest';
+import type { Agent as SuperTestAgent } from 'supertest';
 import type { Client } from '@elastic/elasticsearch';
 import { AUTHENTICATION } from './authentication';
 
-export const createUsersAndRoles = async (es: Client, supertest: SuperTest<any>) => {
+export const createUsersAndRoles = async (es: Client, supertest: SuperTestAgent) => {
   await supertest
     .put('/api/security/role/kibana_legacy_user')
     .send({
diff --git a/x-pack/test/saved_object_api_integration/common/suites/bulk_create.ts b/x-pack/test/saved_object_api_integration/common/suites/bulk_create.ts
index 38a4a8d8db8c7..6b79b34489111 100644
--- a/x-pack/test/saved_object_api_integration/common/suites/bulk_create.ts
+++ b/x-pack/test/saved_object_api_integration/common/suites/bulk_create.ts
@@ -258,7 +258,7 @@ export function bulkCreateTestSuiteFactory(context: FtrProviderContext) {
             const query = test.overwrite ? '?overwrite=true' : '';
             await supertest
               .post(`${getUrlPrefix(spaceId)}/api/saved_objects/_bulk_create${query}`)
-              .auth(user?.username, user?.password)
+              .auth(user?.username!, user?.password!)
               .send(requestBody)
               .expect(test.responseStatusCode)
               .then(test.responseBody);
diff --git a/x-pack/test/saved_object_api_integration/common/suites/bulk_delete.ts b/x-pack/test/saved_object_api_integration/common/suites/bulk_delete.ts
index 578f8a4e0cd1f..f7fe4ba4061ce 100644
--- a/x-pack/test/saved_object_api_integration/common/suites/bulk_delete.ts
+++ b/x-pack/test/saved_object_api_integration/common/suites/bulk_delete.ts
@@ -138,7 +138,7 @@ export function bulkDeleteTestSuiteFactory(context: FtrProviderContext) {
             const query = testForce && testForce === true ? '?force=true' : '';
             await supertest
               .post(`${getUrlPrefix(spaceId)}/api/saved_objects/_bulk_delete${query}`)
-              .auth(user?.username, user?.password)
+              .auth(user?.username!, user?.password!)
               .send(requestBody)
               .expect(test.responseStatusCode)
               .then(test.responseBody);
diff --git a/x-pack/test/saved_object_api_integration/common/suites/bulk_get.ts b/x-pack/test/saved_object_api_integration/common/suites/bulk_get.ts
index 15a51c3db3364..d25d1e0a5d87c 100644
--- a/x-pack/test/saved_object_api_integration/common/suites/bulk_get.ts
+++ b/x-pack/test/saved_object_api_integration/common/suites/bulk_get.ts
@@ -125,7 +125,7 @@ export function bulkGetTestSuiteFactory(context: FtrProviderContext) {
           it(`should return ${test.responseStatusCode} ${test.title}`, async () => {
             await supertest
               .post(`${getUrlPrefix(spaceId)}/api/saved_objects/_bulk_get`)
-              .auth(user?.username, user?.password)
+              .auth(user?.username!, user?.password!)
               .send(test.request)
               .expect(test.responseStatusCode)
               .then(test.responseBody);
diff --git a/x-pack/test/saved_object_api_integration/common/suites/bulk_resolve.ts b/x-pack/test/saved_object_api_integration/common/suites/bulk_resolve.ts
index a203865e294aa..b3c8669d48216 100644
--- a/x-pack/test/saved_object_api_integration/common/suites/bulk_resolve.ts
+++ b/x-pack/test/saved_object_api_integration/common/suites/bulk_resolve.ts
@@ -6,7 +6,7 @@
  */
 
 import expect from '@kbn/expect';
-import { SuperTest } from 'supertest';
+import { Agent as SuperTestAgent } from 'supertest';
 import { TEST_CASES } from './resolve';
 import { SPACES } from '../lib/spaces';
 import {
@@ -29,7 +29,7 @@ export interface BulkResolveTestCase extends TestCase {
 
 export { TEST_CASES }; // re-export the (non-bulk) resolve test cases
 
-export function bulkResolveTestSuiteFactory(esArchiver: any, supertest: SuperTest<any>) {
+export function bulkResolveTestSuiteFactory(esArchiver: any, supertest: SuperTestAgent) {
   const expectSavedObjectForbidden = expectResponses.forbiddenTypes('bulk_get');
   const expectResponseBody =
     (
@@ -119,7 +119,7 @@ export function bulkResolveTestSuiteFactory(esArchiver: any, supertest: SuperTes
           it(`should return ${test.responseStatusCode} ${test.title}`, async () => {
             await supertest
               .post(`${getUrlPrefix(spaceId)}/api/saved_objects/_bulk_resolve`)
-              .auth(user?.username, user?.password)
+              .auth(user?.username!, user?.password!)
               .send(test.request)
               .expect(test.responseStatusCode)
               .then(test.responseBody);
diff --git a/x-pack/test/saved_object_api_integration/common/suites/bulk_update.ts b/x-pack/test/saved_object_api_integration/common/suites/bulk_update.ts
index e79089615e7ee..384b8db8aa0a7 100644
--- a/x-pack/test/saved_object_api_integration/common/suites/bulk_update.ts
+++ b/x-pack/test/saved_object_api_integration/common/suites/bulk_update.ts
@@ -6,7 +6,7 @@
  */
 
 import expect from '@kbn/expect';
-import { SuperTest } from 'supertest';
+import { Agent as SuperTestAgent } from 'supertest';
 import { SAVED_OBJECT_TEST_CASES as CASES } from '../lib/saved_object_test_cases';
 import { SPACES } from '../lib/spaces';
 import { expectResponses, getUrlPrefix, getTestTitle } from '../lib/saved_object_test_utils';
@@ -36,7 +36,7 @@ const createRequest = ({ type, id, namespace }: BulkUpdateTestCase) => ({
   ...(namespace && { namespace }), // individual "object namespace" string
 });
 
-export function bulkUpdateTestSuiteFactory(esArchiver: any, supertest: SuperTest<any>) {
+export function bulkUpdateTestSuiteFactory(esArchiver: any, supertest: SuperTestAgent) {
   const expectSavedObjectForbidden = expectResponses.forbiddenTypes('bulk_update');
   const expectResponseBody =
     (
@@ -118,7 +118,7 @@ export function bulkUpdateTestSuiteFactory(esArchiver: any, supertest: SuperTest
             const requestBody = test.request.map((x) => ({ ...x, ...attrs }));
             await supertest
               .put(`${getUrlPrefix(spaceId)}/api/saved_objects/_bulk_update`)
-              .auth(user?.username, user?.password)
+              .auth(user?.username!, user?.password!)
               .send(requestBody)
               .expect(test.responseStatusCode)
               .then(test.responseBody);
diff --git a/x-pack/test/saved_object_api_integration/common/suites/create.ts b/x-pack/test/saved_object_api_integration/common/suites/create.ts
index dfad5e638a708..b12fef1c7cade 100644
--- a/x-pack/test/saved_object_api_integration/common/suites/create.ts
+++ b/x-pack/test/saved_object_api_integration/common/suites/create.ts
@@ -6,7 +6,7 @@
  */
 
 import expect from '@kbn/expect';
-import { SuperTest } from 'supertest';
+import { Agent as SuperTestAgent } from 'supertest';
 import { SAVED_OBJECT_TEST_CASES as CASES } from '../lib/saved_object_test_cases';
 import { SPACES, ALL_SPACES_ID } from '../lib/spaces';
 import {
@@ -85,7 +85,7 @@ const createRequest = ({ type, id, initialNamespaces }: CreateTestCase) => ({
   initialNamespaces,
 });
 
-export function createTestSuiteFactory(esArchiver: any, supertest: SuperTest<any>) {
+export function createTestSuiteFactory(esArchiver: any, supertest: SuperTestAgent) {
   const expectSavedObjectForbidden = expectResponses.forbiddenTypes('create');
   const expectResponseBody =
     (testCase: CreateTestCase, user?: TestUser): ExpectResponseBody =>
@@ -155,7 +155,7 @@ export function createTestSuiteFactory(esArchiver: any, supertest: SuperTest<any
             const query = test.overwrite ? '?overwrite=true' : '';
             await supertest
               .post(`${getUrlPrefix(spaceId)}/api/saved_objects/${path}${query}`)
-              .auth(user?.username, user?.password)
+              .auth(user?.username!, user?.password!)
               .send(requestBody)
               .expect(test.responseStatusCode)
               .then(test.responseBody);
diff --git a/x-pack/test/saved_object_api_integration/common/suites/delete.ts b/x-pack/test/saved_object_api_integration/common/suites/delete.ts
index 68d84de8bb0e5..032c19cd0f8ae 100644
--- a/x-pack/test/saved_object_api_integration/common/suites/delete.ts
+++ b/x-pack/test/saved_object_api_integration/common/suites/delete.ts
@@ -5,7 +5,7 @@
  * 2.0.
  */
 
-import { SuperTest } from 'supertest';
+import { Agent as SuperTestAgent } from 'supertest';
 import type { Client } from '@elastic/elasticsearch';
 import expect from '@kbn/expect';
 import type { SearchTotalHits } from '@elastic/elasticsearch/lib/api/types';
@@ -38,7 +38,7 @@ export const TEST_CASES: Record<string, DeleteTestCase> = Object.freeze({
  */
 const createRequest = ({ type, id, force }: DeleteTestCase) => ({ type, id, force });
 
-export function deleteTestSuiteFactory(es: Client, esArchiver: any, supertest: SuperTest<any>) {
+export function deleteTestSuiteFactory(es: Client, esArchiver: any, supertest: SuperTestAgent) {
   const expectSavedObjectForbidden = expectResponses.forbiddenTypes('delete');
   const expectResponseBody =
     (testCase: DeleteTestCase): ExpectResponseBody =>
@@ -118,7 +118,7 @@ export function deleteTestSuiteFactory(es: Client, esArchiver: any, supertest: S
             await supertest
               .delete(`${getUrlPrefix(spaceId)}/api/saved_objects/${type}/${id}`)
               .query({ ...(force && { force }) })
-              .auth(user?.username, user?.password)
+              .auth(user?.username!, user?.password!)
               .expect(test.responseStatusCode)
               .then(test.responseBody);
           });
diff --git a/x-pack/test/saved_object_api_integration/common/suites/export.ts b/x-pack/test/saved_object_api_integration/common/suites/export.ts
index 6df4c2f8dd12c..b7936f94a98fb 100644
--- a/x-pack/test/saved_object_api_integration/common/suites/export.ts
+++ b/x-pack/test/saved_object_api_integration/common/suites/export.ts
@@ -6,7 +6,7 @@
  */
 
 import expect from '@kbn/expect';
-import { SuperTest } from 'supertest';
+import { Agent as SuperTestAgent } from 'supertest';
 import {
   SAVED_OBJECT_TEST_CASES,
   CONFLICT_TEST_CASES,
@@ -154,7 +154,7 @@ const EMPTY_RESULT = {
   missingReferences: [],
 };
 
-export function exportTestSuiteFactory(esArchiver: any, supertest: SuperTest<any>) {
+export function exportTestSuiteFactory(esArchiver: any, supertest: SuperTestAgent) {
   const expectSavedObjectForbiddenBulkGet = expectResponses.forbiddenTypes('bulk_get');
   const expectResponseBody =
     (testCase: ExportTestCase): ExpectResponseBody =>
@@ -259,7 +259,7 @@ export function exportTestSuiteFactory(esArchiver: any, supertest: SuperTest<any
           it(`should return ${test.responseStatusCode} ${test.title}`, async () => {
             await supertest
               .post(`${getUrlPrefix(spaceId)}/api/saved_objects/_export`)
-              .auth(user?.username, user?.password)
+              .auth(user?.username!, user?.password!)
               .send(test.request)
               .expect(test.responseStatusCode)
               .then(test.responseBody);
diff --git a/x-pack/test/saved_object_api_integration/common/suites/find.ts b/x-pack/test/saved_object_api_integration/common/suites/find.ts
index 202fc02dbfc1c..c7afc205f5b6f 100644
--- a/x-pack/test/saved_object_api_integration/common/suites/find.ts
+++ b/x-pack/test/saved_object_api_integration/common/suites/find.ts
@@ -6,7 +6,7 @@
  */
 
 import expect from '@kbn/expect';
-import { SuperTest } from 'supertest';
+import { Agent as SuperTestAgent } from 'supertest';
 import querystring from 'querystring';
 import {
   SAVED_OBJECT_TEST_CASES,
@@ -187,7 +187,7 @@ export const createRequest = ({ query }: FindTestCase) => ({ query });
 const getTestTitle = ({ failure, title }: FindTestCase) =>
   `${failure?.reason || 'success'} ["${title}"]`;
 
-export function findTestSuiteFactory(esArchiver: any, supertest: SuperTest<any>) {
+export function findTestSuiteFactory(esArchiver: any, supertest: SuperTestAgent) {
   const expectResponseBody =
     (testCase: FindTestCase, user?: TestUser): ExpectResponseBody =>
     async (response: Record<string, any>) => {
@@ -298,7 +298,7 @@ export function findTestSuiteFactory(esArchiver: any, supertest: SuperTest<any>)
 
             await supertest
               .get(`${getUrlPrefix(spaceId)}/api/saved_objects/_find${query}`)
-              .auth(user?.username, user?.password)
+              .auth(user?.username!, user?.password!)
               .expect(test.responseStatusCode)
               .then(test.responseBody);
           });
diff --git a/x-pack/test/saved_object_api_integration/common/suites/get.ts b/x-pack/test/saved_object_api_integration/common/suites/get.ts
index b106930103f84..024f061d2cb23 100644
--- a/x-pack/test/saved_object_api_integration/common/suites/get.ts
+++ b/x-pack/test/saved_object_api_integration/common/suites/get.ts
@@ -5,7 +5,7 @@
  * 2.0.
  */
 
-import { SuperTest } from 'supertest';
+import { Agent as SuperTestAgent } from 'supertest';
 import { SAVED_OBJECT_TEST_CASES as CASES } from '../lib/saved_object_test_cases';
 import { SPACES } from '../lib/spaces';
 import {
@@ -25,7 +25,7 @@ export type GetTestCase = TestCase;
 const DOES_NOT_EXIST = Object.freeze({ type: 'dashboard', id: 'does-not-exist' });
 export const TEST_CASES: Record<string, GetTestCase> = Object.freeze({ ...CASES, DOES_NOT_EXIST });
 
-export function getTestSuiteFactory(esArchiver: any, supertest: SuperTest<any>) {
+export function getTestSuiteFactory(esArchiver: any, supertest: SuperTestAgent) {
   const expectSavedObjectForbidden = expectResponses.forbiddenTypes('get');
   const expectResponseBody =
     (testCase: GetTestCase): ExpectResponseBody =>
@@ -81,7 +81,7 @@ export function getTestSuiteFactory(esArchiver: any, supertest: SuperTest<any>)
             const { type, id } = test.request;
             await supertest
               .get(`${getUrlPrefix(spaceId)}/api/saved_objects/${type}/${id}`)
-              .auth(user?.username, user?.password)
+              .auth(user?.username!, user?.password!)
               .expect(test.responseStatusCode)
               .then(test.responseBody);
           });
diff --git a/x-pack/test/saved_object_api_integration/common/suites/import.ts b/x-pack/test/saved_object_api_integration/common/suites/import.ts
index 7580521e170a6..1af1bf07510b2 100644
--- a/x-pack/test/saved_object_api_integration/common/suites/import.ts
+++ b/x-pack/test/saved_object_api_integration/common/suites/import.ts
@@ -6,7 +6,7 @@
  */
 
 import expect from '@kbn/expect';
-import { SuperTest } from 'supertest';
+import { Agent as SuperTestAgent } from 'supertest';
 import type { Client } from '@elastic/elasticsearch';
 import type { SavedObjectReference } from '@kbn/core/server';
 import { SAVED_OBJECT_TEST_CASES as CASES } from '../lib/saved_object_test_cases';
@@ -121,7 +121,7 @@ export const importTestCaseFailures = {
     condition !== false ? { failureType: 'missing_references' } : {},
 };
 
-export function importTestSuiteFactory(es: Client, esArchiver: any, supertest: SuperTest<any>) {
+export function importTestSuiteFactory(es: Client, esArchiver: any, supertest: SuperTestAgent) {
   const expectSavedObjectForbidden = (action: string, typeOrTypes: string | string[]) =>
     expectResponses.forbiddenTypes(action)(typeOrTypes);
   const expectResponseBody =
@@ -310,7 +310,7 @@ export function importTestSuiteFactory(es: Client, esArchiver: any, supertest: S
               : '';
             await supertest
               .post(`${getUrlPrefix(spaceId)}/api/saved_objects/_import${query}`)
-              .auth(user?.username, user?.password)
+              .auth(user?.username!, user?.password!)
               .attach('file', Buffer.from(requestBody, 'utf8'), 'export.ndjson')
               .expect(test.responseStatusCode)
               .then(test.responseBody);
diff --git a/x-pack/test/saved_object_api_integration/common/suites/resolve.ts b/x-pack/test/saved_object_api_integration/common/suites/resolve.ts
index ebb71a860d744..8f03686d4cabc 100644
--- a/x-pack/test/saved_object_api_integration/common/suites/resolve.ts
+++ b/x-pack/test/saved_object_api_integration/common/suites/resolve.ts
@@ -6,7 +6,7 @@
  */
 
 import expect from '@kbn/expect';
-import { SuperTest } from 'supertest';
+import { Agent as SuperTestAgent } from 'supertest';
 import { SAVED_OBJECT_TEST_CASES as CASES } from '../lib/saved_object_test_cases';
 import { SPACES } from '../lib/spaces';
 import {
@@ -70,7 +70,7 @@ export const TEST_CASES = Object.freeze({
   HIDDEN: CASES.HIDDEN,
 });
 
-export function resolveTestSuiteFactory(esArchiver: any, supertest: SuperTest<any>) {
+export function resolveTestSuiteFactory(esArchiver: any, supertest: SuperTestAgent) {
   const expectSavedObjectForbidden = expectResponses.forbiddenTypes('bulk_get');
   const expectResponseBody =
     (testCase: ResolveTestCase): ExpectResponseBody =>
@@ -135,7 +135,7 @@ export function resolveTestSuiteFactory(esArchiver: any, supertest: SuperTest<an
             const { type, id } = test.request;
             await supertest
               .get(`${getUrlPrefix(spaceId)}/api/saved_objects/resolve/${type}/${id}`)
-              .auth(user?.username, user?.password)
+              .auth(user?.username!, user?.password!)
               .expect(test.responseStatusCode)
               .then(test.responseBody);
           });
diff --git a/x-pack/test/saved_object_api_integration/common/suites/resolve_import_errors.ts b/x-pack/test/saved_object_api_integration/common/suites/resolve_import_errors.ts
index a7711719da7df..09ff103449118 100644
--- a/x-pack/test/saved_object_api_integration/common/suites/resolve_import_errors.ts
+++ b/x-pack/test/saved_object_api_integration/common/suites/resolve_import_errors.ts
@@ -6,7 +6,7 @@
  */
 
 import expect from '@kbn/expect';
-import { SuperTest } from 'supertest';
+import { Agent as SuperTestAgent } from 'supertest';
 import type { Client } from '@elastic/elasticsearch';
 import type { SavedObjectReference, SavedObjectsImportRetry } from '@kbn/core/server';
 import { SAVED_OBJECT_TEST_CASES as CASES } from '../lib/saved_object_test_cases';
@@ -197,7 +197,7 @@ export const resolveImportErrorsTestCaseFailures = {
 export function resolveImportErrorsTestSuiteFactory(
   es: Client,
   esArchiver: any,
-  supertest: SuperTest<any>
+  supertest: SuperTestAgent
 ) {
   const expectSavedObjectForbidden = (action: string, typeOrTypes: string | string[]) =>
     expectResponses.forbiddenTypes(action)(typeOrTypes);
@@ -373,7 +373,7 @@ export function resolveImportErrorsTestSuiteFactory(
             const query = test.createNewCopies ? '?createNewCopies=true' : '';
             await supertest
               .post(`${getUrlPrefix(spaceId)}/api/saved_objects/_resolve_import_errors${query}`)
-              .auth(user?.username, user?.password)
+              .auth(user?.username!, user?.password!)
               .field('retries', JSON.stringify(test.request.retries))
               .attach('file', Buffer.from(requestBody, 'utf8'), 'export.ndjson')
               .expect(test.responseStatusCode)
diff --git a/x-pack/test/saved_object_api_integration/common/suites/update.ts b/x-pack/test/saved_object_api_integration/common/suites/update.ts
index 1fc2cef6e051a..ee37e0feccfe2 100644
--- a/x-pack/test/saved_object_api_integration/common/suites/update.ts
+++ b/x-pack/test/saved_object_api_integration/common/suites/update.ts
@@ -6,7 +6,7 @@
  */
 
 import expect from '@kbn/expect';
-import { SuperTest } from 'supertest';
+import { Agent as SuperTestAgent } from 'supertest';
 import { SAVED_OBJECT_TEST_CASES as CASES } from '../lib/saved_object_test_cases';
 import { SPACES } from '../lib/spaces';
 import { expectResponses, getUrlPrefix, getTestTitle } from '../lib/saved_object_test_utils';
@@ -34,7 +34,7 @@ export const TEST_CASES: Record<string, UpdateTestCase> = Object.freeze({
 
 const createRequest = ({ type, id, upsert }: UpdateTestCase) => ({ type, id, upsert });
 
-export function updateTestSuiteFactory(esArchiver: any, supertest: SuperTest<any>) {
+export function updateTestSuiteFactory(esArchiver: any, supertest: SuperTestAgent) {
   const expectSavedObjectForbidden = expectResponses.forbiddenTypes('update');
   const expectResponseBody =
     (testCase: UpdateTestCase): ExpectResponseBody =>
@@ -94,7 +94,7 @@ export function updateTestSuiteFactory(esArchiver: any, supertest: SuperTest<any
             const requestBody = { attributes, ...(upsert && { upsert: attributes }) };
             await supertest
               .put(`${getUrlPrefix(spaceId)}/api/saved_objects/${type}/${id}`)
-              .auth(user?.username, user?.password)
+              .auth(user?.username!, user?.password!)
               .send(requestBody)
               .expect(test.responseStatusCode)
               .then(test.responseBody);
diff --git a/x-pack/test/security_solution_api_integration/test_suites/detections_response/detection_engine/exceptions/workflows/basic_license_essentials_tier/create_endpoint_exceptions.ts b/x-pack/test/security_solution_api_integration/test_suites/detections_response/detection_engine/exceptions/workflows/basic_license_essentials_tier/create_endpoint_exceptions.ts
index 728d5328a9174..53a9cc91a6005 100644
--- a/x-pack/test/security_solution_api_integration/test_suites/detections_response/detection_engine/exceptions/workflows/basic_license_essentials_tier/create_endpoint_exceptions.ts
+++ b/x-pack/test/security_solution_api_integration/test_suites/detections_response/detection_engine/exceptions/workflows/basic_license_essentials_tier/create_endpoint_exceptions.ts
@@ -43,7 +43,7 @@ interface Host {
  * @returns The array of hosts sorted
  */
 export const getHostHits = async (
-  supertest: SuperTest.SuperTest<SuperTest.Test>,
+  supertest: SuperTest.Agent,
   log: ToolingLog,
   id: string
 ): Promise<Host[]> => {
diff --git a/x-pack/test/security_solution_api_integration/test_suites/detections_response/detection_engine/rule_execution_logic/trial_license_complete_tier/execution_logic/utils.ts b/x-pack/test/security_solution_api_integration/test_suites/detections_response/detection_engine/rule_execution_logic/trial_license_complete_tier/execution_logic/utils.ts
index ec6fac6cf2bcd..31278019dad3e 100644
--- a/x-pack/test/security_solution_api_integration/test_suites/detections_response/detection_engine/rule_execution_logic/trial_license_complete_tier/execution_logic/utils.ts
+++ b/x-pack/test/security_solution_api_integration/test_suites/detections_response/detection_engine/rule_execution_logic/trial_license_complete_tier/execution_logic/utils.ts
@@ -10,10 +10,7 @@ import supertest from 'supertest';
 import { NodeMetrics } from '@kbn/task-manager-plugin/server/routes/metrics';
 import { RetryService } from '@kbn/ftr-common-functional-services';
 
-export const getMetricsRequest = (
-  request: supertest.SuperTest<supertest.Test>,
-  reset: boolean = false
-) => {
+export const getMetricsRequest = (request: supertest.Agent, reset: boolean = false) => {
   return request
     .get(`/api/task_manager/metrics${reset ? '' : '?reset=false'}`)
     .set('kbn-xsrf', 'foo')
@@ -22,7 +19,7 @@ export const getMetricsRequest = (
 };
 
 export const getMetricsWithRetry = (
-  request: supertest.SuperTest<supertest.Test>,
+  request: supertest.Agent,
   retry: RetryService,
   reset: boolean = false,
   callback?: (metrics: NodeMetrics) => boolean
diff --git a/x-pack/test/security_solution_api_integration/test_suites/detections_response/utils/actions/create_new_webhook_action.ts b/x-pack/test/security_solution_api_integration/test_suites/detections_response/utils/actions/create_new_webhook_action.ts
index 79ea9738372f0..79a5b715f9fe1 100644
--- a/x-pack/test/security_solution_api_integration/test_suites/detections_response/utils/actions/create_new_webhook_action.ts
+++ b/x-pack/test/security_solution_api_integration/test_suites/detections_response/utils/actions/create_new_webhook_action.ts
@@ -17,9 +17,7 @@ import { getWebHookAction } from './get_web_hook_action';
  *
  * @param supertest The supertest deps
  */
-export const createWebHookRuleAction = async (
-  supertest: SuperTest.SuperTest<SuperTest.Test>
-): Promise<RuleAction> => {
+export const createWebHookRuleAction = async (supertest: SuperTest.Agent): Promise<RuleAction> => {
   return (
     await supertest
       .post('/api/actions/action')
diff --git a/x-pack/test/security_solution_api_integration/test_suites/detections_response/utils/alerts/get_alerts.ts b/x-pack/test/security_solution_api_integration/test_suites/detections_response/utils/alerts/get_alerts.ts
index 21d8233c8496b..70caaa4edfd2c 100644
--- a/x-pack/test/security_solution_api_integration/test_suites/detections_response/utils/alerts/get_alerts.ts
+++ b/x-pack/test/security_solution_api_integration/test_suites/detections_response/utils/alerts/get_alerts.ts
@@ -18,7 +18,7 @@ import { refreshIndex } from '..';
 import { getAlertsByIds, waitForRuleStatus } from '../../../../../common/utils/security_solution';
 
 export type GetAlerts = (
-  supertest: SuperTest.SuperTest<SuperTest.Test>,
+  supertest: SuperTest.Agent,
   log: ToolingLog,
   es: Client,
   rule: RuleResponse,
diff --git a/x-pack/test/security_solution_api_integration/test_suites/detections_response/utils/alerts/migrations/finalize_alerts_migration.ts b/x-pack/test/security_solution_api_integration/test_suites/detections_response/utils/alerts/migrations/finalize_alerts_migration.ts
index 02a7475f54aac..1f7d03cab9c5e 100644
--- a/x-pack/test/security_solution_api_integration/test_suites/detections_response/utils/alerts/migrations/finalize_alerts_migration.ts
+++ b/x-pack/test/security_solution_api_integration/test_suites/detections_response/utils/alerts/migrations/finalize_alerts_migration.ts
@@ -21,7 +21,7 @@ export const finalizeAlertsMigration = async ({
   supertest,
   log,
 }: {
-  supertest: SuperTest.SuperTest<SuperTest.Test>;
+  supertest: SuperTest.Agent;
   log: ToolingLog;
   migrationIds: string[];
 }): Promise<FinalizeMigrationResponse[]> => {
diff --git a/x-pack/test/security_solution_api_integration/test_suites/detections_response/utils/alerts/migrations/start_alerts_migration.ts b/x-pack/test/security_solution_api_integration/test_suites/detections_response/utils/alerts/migrations/start_alerts_migration.ts
index 5d472221154c1..304cf11d79dce 100644
--- a/x-pack/test/security_solution_api_integration/test_suites/detections_response/utils/alerts/migrations/start_alerts_migration.ts
+++ b/x-pack/test/security_solution_api_integration/test_suites/detections_response/utils/alerts/migrations/start_alerts_migration.ts
@@ -21,7 +21,7 @@ export const startAlertsMigration = async ({
   supertest,
   log,
 }: {
-  supertest: SuperTest.SuperTest<SuperTest.Test>;
+  supertest: SuperTest.Agent;
   log: ToolingLog;
   indices: string[];
 }): Promise<CreateMigrationResponse[]> => {
diff --git a/x-pack/test/security_solution_api_integration/test_suites/detections_response/utils/alerts/wait_for_alert_to_complete.ts b/x-pack/test/security_solution_api_integration/test_suites/detections_response/utils/alerts/wait_for_alert_to_complete.ts
index 7d942198bc0d5..d6799e6be611c 100644
--- a/x-pack/test/security_solution_api_integration/test_suites/detections_response/utils/alerts/wait_for_alert_to_complete.ts
+++ b/x-pack/test/security_solution_api_integration/test_suites/detections_response/utils/alerts/wait_for_alert_to_complete.ts
@@ -11,7 +11,7 @@ import type SuperTest from 'supertest';
 import { waitFor } from '../../../../../common/utils/security_solution';
 
 export const waitForAlertToComplete = async (
-  supertest: SuperTest.SuperTest<SuperTest.Test>,
+  supertest: SuperTest.Agent,
   log: ToolingLog,
   id: string
 ): Promise<void> => {
diff --git a/x-pack/test/security_solution_api_integration/test_suites/detections_response/utils/connectors/create_connector.ts b/x-pack/test/security_solution_api_integration/test_suites/detections_response/utils/connectors/create_connector.ts
index 0ca8f88166c89..c6c67e37ebf24 100644
--- a/x-pack/test/security_solution_api_integration/test_suites/detections_response/utils/connectors/create_connector.ts
+++ b/x-pack/test/security_solution_api_integration/test_suites/detections_response/utils/connectors/create_connector.ts
@@ -15,7 +15,7 @@ export interface CreateConnectorBody {
 }
 
 export async function createConnector(
-  supertest: SuperTest.SuperTest<SuperTest.Test>,
+  supertest: SuperTest.Agent,
   connector: CreateConnectorBody,
   id = ''
 ): Promise<string> {
diff --git a/x-pack/test/security_solution_api_integration/test_suites/detections_response/utils/connectors/delete_connector.ts b/x-pack/test/security_solution_api_integration/test_suites/detections_response/utils/connectors/delete_connector.ts
index 683f845fd8bf8..1003c7cd8880b 100644
--- a/x-pack/test/security_solution_api_integration/test_suites/detections_response/utils/connectors/delete_connector.ts
+++ b/x-pack/test/security_solution_api_integration/test_suites/detections_response/utils/connectors/delete_connector.ts
@@ -7,9 +7,6 @@
 
 import type SuperTest from 'supertest';
 
-export function deleteConnector(
-  supertest: SuperTest.SuperTest<SuperTest.Test>,
-  connectorId: string
-): SuperTest.Test {
+export function deleteConnector(supertest: SuperTest.Agent, connectorId: string): SuperTest.Test {
   return supertest.delete(`/api/actions/connector/${connectorId}`).set('kbn-xsrf', 'foo');
 }
diff --git a/x-pack/test/security_solution_api_integration/test_suites/detections_response/utils/connectors/get_connector.ts b/x-pack/test/security_solution_api_integration/test_suites/detections_response/utils/connectors/get_connector.ts
index 8f7e4830372f9..9132b188ecd33 100644
--- a/x-pack/test/security_solution_api_integration/test_suites/detections_response/utils/connectors/get_connector.ts
+++ b/x-pack/test/security_solution_api_integration/test_suites/detections_response/utils/connectors/get_connector.ts
@@ -9,7 +9,7 @@ import { Connector } from '@kbn/actions-plugin/server/application/connector/type
 import type SuperTest from 'supertest';
 
 export async function getConnector(
-  supertest: SuperTest.SuperTest<SuperTest.Test>,
+  supertest: SuperTest.Agent,
   connectorId: string
 ): Promise<Connector> {
   const response = await supertest
diff --git a/x-pack/test/security_solution_api_integration/test_suites/detections_response/utils/exception_list_and_item/item/create_exception_list_item.ts b/x-pack/test/security_solution_api_integration/test_suites/detections_response/utils/exception_list_and_item/item/create_exception_list_item.ts
index fccbd3e243b17..39f202c13bce6 100644
--- a/x-pack/test/security_solution_api_integration/test_suites/detections_response/utils/exception_list_and_item/item/create_exception_list_item.ts
+++ b/x-pack/test/security_solution_api_integration/test_suites/detections_response/utils/exception_list_and_item/item/create_exception_list_item.ts
@@ -22,7 +22,7 @@ import { EXCEPTION_LIST_ITEM_URL } from '@kbn/securitysolution-list-constants';
  * @param log The tooling logger
  */
 export const createExceptionListItem = async (
-  supertest: SuperTest.SuperTest<SuperTest.Test>,
+  supertest: SuperTest.Agent,
   log: ToolingLog,
   exceptionListItem: CreateExceptionListItemSchema
 ): Promise<ExceptionListItemSchema> => {
diff --git a/x-pack/test/security_solution_api_integration/test_suites/detections_response/utils/exception_list_and_item/list/create_container_with_endpoint_entries.ts b/x-pack/test/security_solution_api_integration/test_suites/detections_response/utils/exception_list_and_item/list/create_container_with_endpoint_entries.ts
index 7541514448b5c..442d341815c2f 100644
--- a/x-pack/test/security_solution_api_integration/test_suites/detections_response/utils/exception_list_and_item/list/create_container_with_endpoint_entries.ts
+++ b/x-pack/test/security_solution_api_integration/test_suites/detections_response/utils/exception_list_and_item/list/create_container_with_endpoint_entries.ts
@@ -27,7 +27,7 @@ import { createExceptionList } from './create_exception_list';
  * @param osTypes The os types to optionally add or not to add to the container
  */
 export const createContainerWithEndpointEntries = async (
-  supertest: SuperTest.SuperTest<SuperTest.Test>,
+  supertest: SuperTest.Agent,
   log: ToolingLog,
   endpointEntries: Array<{
     entries: NonEmptyEntriesArray;
diff --git a/x-pack/test/security_solution_api_integration/test_suites/detections_response/utils/exception_list_and_item/list/create_container_with_entries.ts b/x-pack/test/security_solution_api_integration/test_suites/detections_response/utils/exception_list_and_item/list/create_container_with_entries.ts
index 973e0d1962a75..36aa1fb0e0652 100644
--- a/x-pack/test/security_solution_api_integration/test_suites/detections_response/utils/exception_list_and_item/list/create_container_with_entries.ts
+++ b/x-pack/test/security_solution_api_integration/test_suites/detections_response/utils/exception_list_and_item/list/create_container_with_entries.ts
@@ -23,7 +23,7 @@ import { waitFor } from '../../../../../../common/utils/security_solution';
  * @param osTypes The os types to optionally add or not to add to the container
  */
 export const createContainerWithEntries = async (
-  supertest: SuperTest.SuperTest<SuperTest.Test>,
+  supertest: SuperTest.Agent,
   log: ToolingLog,
   entries: NonEmptyEntriesArray[]
 ): Promise<ListArray> => {
diff --git a/x-pack/test/security_solution_api_integration/test_suites/detections_response/utils/exception_list_and_item/list/create_exception_list.ts b/x-pack/test/security_solution_api_integration/test_suites/detections_response/utils/exception_list_and_item/list/create_exception_list.ts
index 24ebabb5243b2..cae20d074a1c3 100644
--- a/x-pack/test/security_solution_api_integration/test_suites/detections_response/utils/exception_list_and_item/list/create_exception_list.ts
+++ b/x-pack/test/security_solution_api_integration/test_suites/detections_response/utils/exception_list_and_item/list/create_exception_list.ts
@@ -23,7 +23,7 @@ import { deleteExceptionList } from './delete_exception_list';
  * @param log The tooling logger
  */
 export const createExceptionList = async (
-  supertest: SuperTest.SuperTest<SuperTest.Test>,
+  supertest: SuperTest.Agent,
   log: ToolingLog,
   exceptionList: CreateExceptionListSchema
 ): Promise<ExceptionListSchema> => {
diff --git a/x-pack/test/security_solution_api_integration/test_suites/detections_response/utils/exception_list_and_item/list/delete_exception_list.ts b/x-pack/test/security_solution_api_integration/test_suites/detections_response/utils/exception_list_and_item/list/delete_exception_list.ts
index 6c5558a005b97..17cc52ac8c4b6 100644
--- a/x-pack/test/security_solution_api_integration/test_suites/detections_response/utils/exception_list_and_item/list/delete_exception_list.ts
+++ b/x-pack/test/security_solution_api_integration/test_suites/detections_response/utils/exception_list_and_item/list/delete_exception_list.ts
@@ -18,7 +18,7 @@ import type { RuleResponse } from '@kbn/security-solution-plugin/common/api/dete
  * @param log The tooling logger
  */
 export const deleteExceptionList = async (
-  supertest: SuperTest.SuperTest<SuperTest.Test>,
+  supertest: SuperTest.Agent,
   log: ToolingLog,
   listId: string
 ): Promise<RuleResponse> => {
diff --git a/x-pack/test/security_solution_api_integration/test_suites/detections_response/utils/get_stats.ts b/x-pack/test/security_solution_api_integration/test_suites/detections_response/utils/get_stats.ts
index 9415f6900a54f..bd8b3d3ea175c 100644
--- a/x-pack/test/security_solution_api_integration/test_suites/detections_response/utils/get_stats.ts
+++ b/x-pack/test/security_solution_api_integration/test_suites/detections_response/utils/get_stats.ts
@@ -22,7 +22,7 @@ import { getDetectionMetricsFromBody } from './get_detection_metrics_from_body';
  * @returns The detection metrics
  */
 export const getStats = async (
-  supertest: SuperTest.SuperTest<SuperTest.Test>,
+  supertest: SuperTest.Agent,
   log: ToolingLog
 ): Promise<DetectionMetrics> => {
   const response = await supertest
diff --git a/x-pack/test/security_solution_api_integration/test_suites/detections_response/utils/machine_learning/machine_learning_setup.ts b/x-pack/test/security_solution_api_integration/test_suites/detections_response/utils/machine_learning/machine_learning_setup.ts
index d7c7e6387c739..a9b9bf1c8ce5b 100644
--- a/x-pack/test/security_solution_api_integration/test_suites/detections_response/utils/machine_learning/machine_learning_setup.ts
+++ b/x-pack/test/security_solution_api_integration/test_suites/detections_response/utils/machine_learning/machine_learning_setup.ts
@@ -15,7 +15,7 @@ export const executeSetupModuleRequest = async ({
 }: {
   module: string;
   rspCode: number;
-  supertest: SuperTest.SuperTest<SuperTest.Test>;
+  supertest: SuperTest.Agent;
 }) => {
   const { body } = await supertest
     .post(`/internal/ml/modules/setup/${module}`)
@@ -40,7 +40,7 @@ export const forceStartDatafeeds = async ({
 }: {
   jobId: string;
   rspCode: number;
-  supertest: SuperTest.SuperTest<SuperTest.Test>;
+  supertest: SuperTest.Agent;
 }) => {
   const { body } = await supertest
     .post(`/internal/ml/jobs/force_start_datafeeds`)
diff --git a/x-pack/test/security_solution_api_integration/test_suites/detections_response/utils/rules/create_legacy_rule_action.ts b/x-pack/test/security_solution_api_integration/test_suites/detections_response/utils/rules/create_legacy_rule_action.ts
index 8e0cb59d5ee90..439dd6a44f4d8 100644
--- a/x-pack/test/security_solution_api_integration/test_suites/detections_response/utils/rules/create_legacy_rule_action.ts
+++ b/x-pack/test/security_solution_api_integration/test_suites/detections_response/utils/rules/create_legacy_rule_action.ts
@@ -10,7 +10,7 @@ import type SuperTest from 'supertest';
 import { UPDATE_OR_CREATE_LEGACY_ACTIONS } from '@kbn/security-solution-plugin/common/constants';
 
 export const createLegacyRuleAction = async (
-  supertest: SuperTest.SuperTest<SuperTest.Test>,
+  supertest: SuperTest.Agent,
   alertId: string,
   connectorId: string
 ): Promise<unknown> =>
diff --git a/x-pack/test/security_solution_api_integration/test_suites/detections_response/utils/rules/create_non_security_rule.ts b/x-pack/test/security_solution_api_integration/test_suites/detections_response/utils/rules/create_non_security_rule.ts
index 09bc0f9b81a6d..c6fd0f8d1bc78 100644
--- a/x-pack/test/security_solution_api_integration/test_suites/detections_response/utils/rules/create_non_security_rule.ts
+++ b/x-pack/test/security_solution_api_integration/test_suites/detections_response/utils/rules/create_non_security_rule.ts
@@ -30,9 +30,7 @@ const SIMPLE_APM_RULE_DATA = {
  * Created a non security rule. Helpful in tests to verify functionality works with presence of non security rules.
  * @param supertest The supertest deps
  */
-export async function createNonSecurityRule(
-  supertest: SuperTest.SuperTest<SuperTest.Test>
-): Promise<void> {
+export async function createNonSecurityRule(supertest: SuperTest.Agent): Promise<void> {
   await supertest
     .post('/api/alerting/rule')
     .set('kbn-xsrf', 'true')
diff --git a/x-pack/test/security_solution_api_integration/test_suites/detections_response/utils/rules/create_rule_saved_object.ts b/x-pack/test/security_solution_api_integration/test_suites/detections_response/utils/rules/create_rule_saved_object.ts
index 93a6322011623..f4e3f22a0c9a6 100644
--- a/x-pack/test/security_solution_api_integration/test_suites/detections_response/utils/rules/create_rule_saved_object.ts
+++ b/x-pack/test/security_solution_api_integration/test_suites/detections_response/utils/rules/create_rule_saved_object.ts
@@ -21,7 +21,7 @@ import {
  * @param supertest
  */
 export const createRuleThroughAlertingEndpoint = async (
-  supertest: SuperTest.SuperTest<SuperTest.Test>,
+  supertest: SuperTest.Agent,
   rule: InternalRuleCreate
 ): Promise<Rule<BaseRuleParams>> => {
   const { body } = await supertest
diff --git a/x-pack/test/security_solution_api_integration/test_suites/detections_response/utils/rules/create_rule_with_auth.ts b/x-pack/test/security_solution_api_integration/test_suites/detections_response/utils/rules/create_rule_with_auth.ts
index 7b5e4435a3dbb..cde330f8c76a1 100644
--- a/x-pack/test/security_solution_api_integration/test_suites/detections_response/utils/rules/create_rule_with_auth.ts
+++ b/x-pack/test/security_solution_api_integration/test_suites/detections_response/utils/rules/create_rule_with_auth.ts
@@ -19,7 +19,7 @@ import type {
  * @param rule The rule to create
  */
 export const createRuleWithAuth = async (
-  supertest: SuperTest.SuperTest<SuperTest.Test>,
+  supertest: SuperTest.Agent,
   rule: RuleCreateProps,
   auth: { user: string; pass: string }
 ): Promise<RuleResponse> => {
diff --git a/x-pack/test/security_solution_api_integration/test_suites/detections_response/utils/rules/create_rule_with_exception_entries.ts b/x-pack/test/security_solution_api_integration/test_suites/detections_response/utils/rules/create_rule_with_exception_entries.ts
index ca2a8129b7713..a04ac5950596e 100644
--- a/x-pack/test/security_solution_api_integration/test_suites/detections_response/utils/rules/create_rule_with_exception_entries.ts
+++ b/x-pack/test/security_solution_api_integration/test_suites/detections_response/utils/rules/create_rule_with_exception_entries.ts
@@ -31,7 +31,7 @@ import { createRule } from '../../../../../common/utils/security_solution';
  * @param osTypes The os types to optionally add or not to add to the container
  */
 export const createRuleWithExceptionEntries = async (
-  supertest: SuperTest.SuperTest<SuperTest.Test>,
+  supertest: SuperTest.Agent,
   log: ToolingLog,
   rule: RuleCreateProps,
   entries: NonEmptyEntriesArray[],
diff --git a/x-pack/test/security_solution_api_integration/test_suites/detections_response/utils/rules/fetch_rule.ts b/x-pack/test/security_solution_api_integration/test_suites/detections_response/utils/rules/fetch_rule.ts
index 8e9e1008ff404..651bb2a595f8f 100644
--- a/x-pack/test/security_solution_api_integration/test_suites/detections_response/utils/rules/fetch_rule.ts
+++ b/x-pack/test/security_solution_api_integration/test_suites/detections_response/utils/rules/fetch_rule.ts
@@ -18,7 +18,7 @@ import { DETECTION_ENGINE_RULES_URL } from '@kbn/security-solution-plugin/common
  * @param rule The rule to create
  */
 export const fetchRule = async (
-  supertest: SuperTest.SuperTest<SuperTest.Test>,
+  supertest: SuperTest.Agent,
   idOrRuleId: { id: string; ruleId?: never } | { id?: never; ruleId: string }
 ): Promise<RuleResponse> =>
   (
diff --git a/x-pack/test/security_solution_api_integration/test_suites/detections_response/utils/rules/find_immutable_rule_by_id.ts b/x-pack/test/security_solution_api_integration/test_suites/detections_response/utils/rules/find_immutable_rule_by_id.ts
index 55e7375c48986..f4b026748e986 100644
--- a/x-pack/test/security_solution_api_integration/test_suites/detections_response/utils/rules/find_immutable_rule_by_id.ts
+++ b/x-pack/test/security_solution_api_integration/test_suites/detections_response/utils/rules/find_immutable_rule_by_id.ts
@@ -17,7 +17,7 @@ import { DETECTION_ENGINE_RULES_URL } from '@kbn/security-solution-plugin/common
  * @param supertest The supertest deps
  */
 export const findImmutableRuleById = async (
-  supertest: SuperTest.SuperTest<SuperTest.Test>,
+  supertest: SuperTest.Agent,
   log: ToolingLog,
   ruleId: string
 ): Promise<{
diff --git a/x-pack/test/security_solution_api_integration/test_suites/detections_response/utils/rules/get_coverage_overview.ts b/x-pack/test/security_solution_api_integration/test_suites/detections_response/utils/rules/get_coverage_overview.ts
index f93a29b0ec149..b512494f245e2 100644
--- a/x-pack/test/security_solution_api_integration/test_suites/detections_response/utils/rules/get_coverage_overview.ts
+++ b/x-pack/test/security_solution_api_integration/test_suites/detections_response/utils/rules/get_coverage_overview.ts
@@ -13,7 +13,7 @@ import {
 } from '@kbn/security-solution-plugin/common/api/detection_engine';
 
 export const getCoverageOverview = async (
-  supertest: SuperTest.SuperTest<SuperTest.Test>,
+  supertest: SuperTest.Agent,
   filter?: CoverageOverviewFilter
 ): Promise<CoverageOverviewResponse> => {
   const response = await supertest
diff --git a/x-pack/test/security_solution_api_integration/test_suites/detections_response/utils/rules/get_rule_actions.ts b/x-pack/test/security_solution_api_integration/test_suites/detections_response/utils/rules/get_rule_actions.ts
index 3251d2b0a6b56..36784cc47aa1a 100644
--- a/x-pack/test/security_solution_api_integration/test_suites/detections_response/utils/rules/get_rule_actions.ts
+++ b/x-pack/test/security_solution_api_integration/test_suites/detections_response/utils/rules/get_rule_actions.ts
@@ -11,19 +11,16 @@ import { RuleActionArray } from '@kbn/securitysolution-io-ts-alerting-types';
 import { getSlackAction } from '..';
 import { getWebHookAction } from '..';
 
-const createConnector = async (
-  supertest: SuperTest.SuperTest<SuperTest.Test>,
-  payload: Record<string, unknown>
-) =>
+const createConnector = async (supertest: SuperTest.Agent, payload: Record<string, unknown>) =>
   (await supertest.post('/api/actions/action').set('kbn-xsrf', 'true').send(payload).expect(200))
     .body;
-const createWebHookConnector = (supertest: SuperTest.SuperTest<SuperTest.Test>) =>
+const createWebHookConnector = (supertest: SuperTest.Agent) =>
   createConnector(supertest, getWebHookAction());
-const createSlackConnector = (supertest: SuperTest.SuperTest<SuperTest.Test>) =>
+const createSlackConnector = (supertest: SuperTest.Agent) =>
   createConnector(supertest, getSlackAction());
 
 export const getActionsWithoutFrequencies = async (
-  supertest: SuperTest.SuperTest<SuperTest.Test>
+  supertest: SuperTest.Agent
 ): Promise<RuleActionArray> => {
   const webHookAction = await createWebHookConnector(supertest);
   const slackConnector = await createSlackConnector(supertest);
@@ -44,7 +41,7 @@ export const getActionsWithoutFrequencies = async (
 };
 
 export const getActionsWithFrequencies = async (
-  supertest: SuperTest.SuperTest<SuperTest.Test>
+  supertest: SuperTest.Agent
 ): Promise<RuleActionArray> => {
   const webHookAction = await createWebHookConnector(supertest);
   const slackConnector = await createSlackConnector(supertest);
@@ -67,7 +64,7 @@ export const getActionsWithFrequencies = async (
 };
 
 export const getSomeActionsWithFrequencies = async (
-  supertest: SuperTest.SuperTest<SuperTest.Test>
+  supertest: SuperTest.Agent
 ): Promise<RuleActionArray> => {
   const webHookAction = await createWebHookConnector(supertest);
   const slackConnector = await createSlackConnector(supertest);
diff --git a/x-pack/test/security_solution_api_integration/test_suites/detections_response/utils/rules/patch_rule.ts b/x-pack/test/security_solution_api_integration/test_suites/detections_response/utils/rules/patch_rule.ts
index f62f49b20d622..44456c93a16cd 100644
--- a/x-pack/test/security_solution_api_integration/test_suites/detections_response/utils/rules/patch_rule.ts
+++ b/x-pack/test/security_solution_api_integration/test_suites/detections_response/utils/rules/patch_rule.ts
@@ -21,7 +21,7 @@ import {
  * @param rule The rule to create
  */
 export const patchRule = async (
-  supertest: SuperTest.SuperTest<SuperTest.Test>,
+  supertest: SuperTest.Agent,
   log: ToolingLog,
   patchedRule: RulePatchProps
 ): Promise<RuleResponse> => {
diff --git a/x-pack/test/security_solution_api_integration/test_suites/detections_response/utils/rules/prebuilt_rules/delete_prebuilt_rules_fleet_package.ts b/x-pack/test/security_solution_api_integration/test_suites/detections_response/utils/rules/prebuilt_rules/delete_prebuilt_rules_fleet_package.ts
index 1647ff301a324..a3468ccb32b5a 100644
--- a/x-pack/test/security_solution_api_integration/test_suites/detections_response/utils/rules/prebuilt_rules/delete_prebuilt_rules_fleet_package.ts
+++ b/x-pack/test/security_solution_api_integration/test_suites/detections_response/utils/rules/prebuilt_rules/delete_prebuilt_rules_fleet_package.ts
@@ -13,9 +13,7 @@ import type SuperTest from 'supertest';
  *
  * @param supertest Supertest instance
  */
-export async function deletePrebuiltRulesFleetPackage(
-  supertest: SuperTest.SuperTest<SuperTest.Test>
-) {
+export async function deletePrebuiltRulesFleetPackage(supertest: SuperTest.Agent) {
   const resp = await supertest
     .get(epmRouteService.getInfoPath('security_detection_engine'))
     .set('kbn-xsrf', 'true')
diff --git a/x-pack/test/security_solution_api_integration/test_suites/detections_response/utils/rules/prebuilt_rules/get_installed_rules.ts b/x-pack/test/security_solution_api_integration/test_suites/detections_response/utils/rules/prebuilt_rules/get_installed_rules.ts
index f796dd06e777b..04a9c52565bf1 100644
--- a/x-pack/test/security_solution_api_integration/test_suites/detections_response/utils/rules/prebuilt_rules/get_installed_rules.ts
+++ b/x-pack/test/security_solution_api_integration/test_suites/detections_response/utils/rules/prebuilt_rules/get_installed_rules.ts
@@ -17,9 +17,7 @@ import { FindRulesResponse } from '@kbn/security-solution-plugin/common/api/dete
  * @returns Fleet install package response
  */
 
-export const getInstalledRules = async (
-  supertest: SuperTest.SuperTest<SuperTest.Test>
-): Promise<FindRulesResponse> => {
+export const getInstalledRules = async (supertest: SuperTest.Agent): Promise<FindRulesResponse> => {
   const { body: rulesResponse } = await supertest
     .get(`${DETECTION_ENGINE_RULES_URL_FIND}?per_page=10000`)
     .set('kbn-xsrf', 'true')
diff --git a/x-pack/test/security_solution_api_integration/test_suites/detections_response/utils/rules/prebuilt_rules/get_prebuilt_rules_and_timelines_status.ts b/x-pack/test/security_solution_api_integration/test_suites/detections_response/utils/rules/prebuilt_rules/get_prebuilt_rules_and_timelines_status.ts
index 7f683ca9994be..420f8a7aca1ce 100644
--- a/x-pack/test/security_solution_api_integration/test_suites/detections_response/utils/rules/prebuilt_rules/get_prebuilt_rules_and_timelines_status.ts
+++ b/x-pack/test/security_solution_api_integration/test_suites/detections_response/utils/rules/prebuilt_rules/get_prebuilt_rules_and_timelines_status.ts
@@ -21,7 +21,7 @@ import { refreshSavedObjectIndices } from '../../refresh_index';
  */
 export const getPrebuiltRulesAndTimelinesStatus = async (
   es: Client,
-  supertest: SuperTest.SuperTest<SuperTest.Test>
+  supertest: SuperTest.Agent
 ): Promise<GetPrebuiltRulesAndTimelinesStatusResponse> => {
   await refreshSavedObjectIndices(es);
 
diff --git a/x-pack/test/security_solution_api_integration/test_suites/detections_response/utils/rules/prebuilt_rules/get_prebuilt_rules_fleet_package.ts b/x-pack/test/security_solution_api_integration/test_suites/detections_response/utils/rules/prebuilt_rules/get_prebuilt_rules_fleet_package.ts
index ec69b6cfb14c2..2441e6f4dbc88 100644
--- a/x-pack/test/security_solution_api_integration/test_suites/detections_response/utils/rules/prebuilt_rules/get_prebuilt_rules_fleet_package.ts
+++ b/x-pack/test/security_solution_api_integration/test_suites/detections_response/utils/rules/prebuilt_rules/get_prebuilt_rules_fleet_package.ts
@@ -14,7 +14,7 @@ import type SuperTest from 'supertest';
  * @param supertest Supertest instance
  * @returns The API endpoint response. Will have status 200 if package installed or 404 if not
  */
-export async function getPrebuiltRulesFleetPackage(supertest: SuperTest.SuperTest<SuperTest.Test>) {
+export async function getPrebuiltRulesFleetPackage(supertest: SuperTest.Agent) {
   return await supertest
     .get(epmRouteService.getInfoPath('security_detection_engine'))
     .set('kbn-xsrf', 'true')
diff --git a/x-pack/test/security_solution_api_integration/test_suites/detections_response/utils/rules/prebuilt_rules/get_prebuilt_rules_status.ts b/x-pack/test/security_solution_api_integration/test_suites/detections_response/utils/rules/prebuilt_rules/get_prebuilt_rules_status.ts
index da044637fc77b..10ca202c66f46 100644
--- a/x-pack/test/security_solution_api_integration/test_suites/detections_response/utils/rules/prebuilt_rules/get_prebuilt_rules_status.ts
+++ b/x-pack/test/security_solution_api_integration/test_suites/detections_response/utils/rules/prebuilt_rules/get_prebuilt_rules_status.ts
@@ -20,7 +20,7 @@ import { refreshSavedObjectIndices } from '../../refresh_index';
  */
 export const getPrebuiltRulesStatus = async (
   es: Client,
-  supertest: SuperTest.SuperTest<SuperTest.Test>
+  supertest: SuperTest.Agent
 ): Promise<GetPrebuiltRulesStatusResponseBody> => {
   await refreshSavedObjectIndices(es);
 
diff --git a/x-pack/test/security_solution_api_integration/test_suites/detections_response/utils/rules/prebuilt_rules/install_fleet_package_by_url.ts b/x-pack/test/security_solution_api_integration/test_suites/detections_response/utils/rules/prebuilt_rules/install_fleet_package_by_url.ts
index 863e4d79fb006..b88a848758a8f 100644
--- a/x-pack/test/security_solution_api_integration/test_suites/detections_response/utils/rules/prebuilt_rules/install_fleet_package_by_url.ts
+++ b/x-pack/test/security_solution_api_integration/test_suites/detections_response/utils/rules/prebuilt_rules/install_fleet_package_by_url.ts
@@ -26,7 +26,7 @@ const ATTEMPT_TIMEOUT = 120000;
 
 export const installPrebuiltRulesPackageViaFleetAPI = async (
   es: Client,
-  supertest: SuperTest.SuperTest<SuperTest.Test>,
+  supertest: SuperTest.Agent,
   retryService: RetryService
 ): Promise<InstallPackageResponse> => {
   const fleetResponse = await retryService.tryWithRetries<InstallPackageResponse>(
@@ -66,7 +66,7 @@ export const installPrebuiltRulesPackageViaFleetAPI = async (
 
 export const installPrebuiltRulesPackageByVersion = async (
   es: Client,
-  supertest: SuperTest.SuperTest<SuperTest.Test>,
+  supertest: SuperTest.Agent,
   version: string,
   retryService: RetryService
 ): Promise<InstallPackageResponse> => {
diff --git a/x-pack/test/security_solution_api_integration/test_suites/detections_response/utils/rules/prebuilt_rules/install_mock_prebuilt_rules.ts b/x-pack/test/security_solution_api_integration/test_suites/detections_response/utils/rules/prebuilt_rules/install_mock_prebuilt_rules.ts
index 0e15f416e1238..843d0531e53ba 100644
--- a/x-pack/test/security_solution_api_integration/test_suites/detections_response/utils/rules/prebuilt_rules/install_mock_prebuilt_rules.ts
+++ b/x-pack/test/security_solution_api_integration/test_suites/detections_response/utils/rules/prebuilt_rules/install_mock_prebuilt_rules.ts
@@ -19,7 +19,7 @@ import { installPrebuiltRulesAndTimelines } from './install_prebuilt_rules_and_t
  * @returns Install prebuilt rules response
  */
 export const installMockPrebuiltRules = async (
-  supertest: SuperTest.SuperTest<SuperTest.Test>,
+  supertest: SuperTest.Agent,
   es: Client
 ): Promise<InstallPrebuiltRulesAndTimelinesResponse> => {
   // Ensure there are prebuilt rule saved objects before installing rules
diff --git a/x-pack/test/security_solution_api_integration/test_suites/detections_response/utils/rules/prebuilt_rules/install_prebuilt_rules.ts b/x-pack/test/security_solution_api_integration/test_suites/detections_response/utils/rules/prebuilt_rules/install_prebuilt_rules.ts
index 499f97877bf16..eec88072e7d1e 100644
--- a/x-pack/test/security_solution_api_integration/test_suites/detections_response/utils/rules/prebuilt_rules/install_prebuilt_rules.ts
+++ b/x-pack/test/security_solution_api_integration/test_suites/detections_response/utils/rules/prebuilt_rules/install_prebuilt_rules.ts
@@ -30,7 +30,7 @@ import { refreshSavedObjectIndices } from '../../refresh_index';
  */
 export const installPrebuiltRules = async (
   es: Client,
-  supertest: SuperTest.SuperTest<SuperTest.Test>,
+  supertest: SuperTest.Agent,
   rules?: RuleVersionSpecifier[]
 ): Promise<PerformRuleInstallationResponseBody> => {
   let payload = {};
diff --git a/x-pack/test/security_solution_api_integration/test_suites/detections_response/utils/rules/prebuilt_rules/install_prebuilt_rules_and_timelines.ts b/x-pack/test/security_solution_api_integration/test_suites/detections_response/utils/rules/prebuilt_rules/install_prebuilt_rules_and_timelines.ts
index c83e8693f2390..a52a44a90bfe7 100644
--- a/x-pack/test/security_solution_api_integration/test_suites/detections_response/utils/rules/prebuilt_rules/install_prebuilt_rules_and_timelines.ts
+++ b/x-pack/test/security_solution_api_integration/test_suites/detections_response/utils/rules/prebuilt_rules/install_prebuilt_rules_and_timelines.ts
@@ -31,7 +31,7 @@ import { refreshSavedObjectIndices } from '../../refresh_index';
  */
 export const installPrebuiltRulesAndTimelines = async (
   es: Client,
-  supertest: SuperTest.SuperTest<SuperTest.Test>
+  supertest: SuperTest.Agent
 ): Promise<InstallPrebuiltRulesAndTimelinesResponse> => {
   const response = await supertest
     .put(PREBUILT_RULES_URL)
diff --git a/x-pack/test/security_solution_api_integration/test_suites/detections_response/utils/rules/prebuilt_rules/install_prebuilt_rules_fleet_package.ts b/x-pack/test/security_solution_api_integration/test_suites/detections_response/utils/rules/prebuilt_rules/install_prebuilt_rules_fleet_package.ts
index cbe609501a5f2..f7a7337d40241 100644
--- a/x-pack/test/security_solution_api_integration/test_suites/detections_response/utils/rules/prebuilt_rules/install_prebuilt_rules_fleet_package.ts
+++ b/x-pack/test/security_solution_api_integration/test_suites/detections_response/utils/rules/prebuilt_rules/install_prebuilt_rules_fleet_package.ts
@@ -36,7 +36,7 @@ export const installPrebuiltRulesFleetPackage = async ({
   retryService,
 }: {
   es: Client;
-  supertest: SuperTest.SuperTest<SuperTest.Test>;
+  supertest: SuperTest.Agent;
   version?: string;
   overrideExistingPackage: boolean;
   retryService: RetryService;
diff --git a/x-pack/test/security_solution_api_integration/test_suites/detections_response/utils/rules/prebuilt_rules/review_install_prebuilt_rules.ts b/x-pack/test/security_solution_api_integration/test_suites/detections_response/utils/rules/prebuilt_rules/review_install_prebuilt_rules.ts
index 573b481a3b30f..487d2dbe53044 100644
--- a/x-pack/test/security_solution_api_integration/test_suites/detections_response/utils/rules/prebuilt_rules/review_install_prebuilt_rules.ts
+++ b/x-pack/test/security_solution_api_integration/test_suites/detections_response/utils/rules/prebuilt_rules/review_install_prebuilt_rules.ts
@@ -16,7 +16,7 @@ import type SuperTest from 'supertest';
  * @returns Review Install prebuilt rules response
  */
 export const reviewPrebuiltRulesToInstall = async (
-  supertest: SuperTest.SuperTest<SuperTest.Test>
+  supertest: SuperTest.Agent
 ): Promise<ReviewRuleInstallationResponseBody> => {
   const response = await supertest
     .post(REVIEW_RULE_INSTALLATION_URL)
diff --git a/x-pack/test/security_solution_api_integration/test_suites/detections_response/utils/rules/prebuilt_rules/review_upgrade_prebuilt_rules.ts b/x-pack/test/security_solution_api_integration/test_suites/detections_response/utils/rules/prebuilt_rules/review_upgrade_prebuilt_rules.ts
index 9bbf980dcccca..17347ffcdd1e3 100644
--- a/x-pack/test/security_solution_api_integration/test_suites/detections_response/utils/rules/prebuilt_rules/review_upgrade_prebuilt_rules.ts
+++ b/x-pack/test/security_solution_api_integration/test_suites/detections_response/utils/rules/prebuilt_rules/review_upgrade_prebuilt_rules.ts
@@ -16,7 +16,7 @@ import type SuperTest from 'supertest';
  * @returns Review Upgrade prebuilt rules response
  */
 export const reviewPrebuiltRulesToUpgrade = async (
-  supertest: SuperTest.SuperTest<SuperTest.Test>
+  supertest: SuperTest.Agent
 ): Promise<ReviewRuleUpgradeResponseBody> => {
   const response = await supertest
     .post(REVIEW_RULE_UPGRADE_URL)
diff --git a/x-pack/test/security_solution_api_integration/test_suites/detections_response/utils/rules/prebuilt_rules/upgrade_prebuilt_rules.ts b/x-pack/test/security_solution_api_integration/test_suites/detections_response/utils/rules/prebuilt_rules/upgrade_prebuilt_rules.ts
index c22aa9106a272..f12d0adbc65f3 100644
--- a/x-pack/test/security_solution_api_integration/test_suites/detections_response/utils/rules/prebuilt_rules/upgrade_prebuilt_rules.ts
+++ b/x-pack/test/security_solution_api_integration/test_suites/detections_response/utils/rules/prebuilt_rules/upgrade_prebuilt_rules.ts
@@ -26,7 +26,7 @@ import { refreshSavedObjectIndices } from '../../refresh_index';
  */
 export const upgradePrebuiltRules = async (
   es: Client,
-  supertest: SuperTest.SuperTest<SuperTest.Test>,
+  supertest: SuperTest.Agent,
   rules?: RuleVersionSpecifier[]
 ): Promise<PerformRuleUpgradeResponseBody> => {
   let payload = {};
diff --git a/x-pack/test/security_solution_api_integration/test_suites/detections_response/utils/rules/preview_rule.ts b/x-pack/test/security_solution_api_integration/test_suites/detections_response/utils/rules/preview_rule.ts
index ec060c4076404..a939454e72c9f 100644
--- a/x-pack/test/security_solution_api_integration/test_suites/detections_response/utils/rules/preview_rule.ts
+++ b/x-pack/test/security_solution_api_integration/test_suites/detections_response/utils/rules/preview_rule.ts
@@ -27,7 +27,7 @@ export const previewRule = async ({
   invocationCount = 1,
   timeframeEnd = new Date(),
 }: {
-  supertest: SuperTest.SuperTest<SuperTest.Test>;
+  supertest: SuperTest.Agent;
   rule: RuleCreateProps;
   invocationCount?: number;
   timeframeEnd?: Date;
diff --git a/x-pack/test/security_solution_api_integration/test_suites/detections_response/utils/rules/preview_rule_with_exception_entries.ts b/x-pack/test/security_solution_api_integration/test_suites/detections_response/utils/rules/preview_rule_with_exception_entries.ts
index fb5d480bbbffc..f02a5d370daaa 100644
--- a/x-pack/test/security_solution_api_integration/test_suites/detections_response/utils/rules/preview_rule_with_exception_entries.ts
+++ b/x-pack/test/security_solution_api_integration/test_suites/detections_response/utils/rules/preview_rule_with_exception_entries.ts
@@ -35,7 +35,7 @@ export const previewRuleWithExceptionEntries = async ({
   invocationCount,
   timeframeEnd,
 }: {
-  supertest: SuperTest.SuperTest<SuperTest.Test>;
+  supertest: SuperTest.Agent;
   log: ToolingLog;
   rule: RuleCreateProps;
   entries: NonEmptyEntriesArray[];
diff --git a/x-pack/test/security_solution_api_integration/test_suites/detections_response/utils/rules/update_rule.ts b/x-pack/test/security_solution_api_integration/test_suites/detections_response/utils/rules/update_rule.ts
index 5c6c69a230465..cee439311d2a1 100644
--- a/x-pack/test/security_solution_api_integration/test_suites/detections_response/utils/rules/update_rule.ts
+++ b/x-pack/test/security_solution_api_integration/test_suites/detections_response/utils/rules/update_rule.ts
@@ -21,7 +21,7 @@ import {
  * @param rule The rule to create
  */
 export const updateRule = async (
-  supertest: SuperTest.SuperTest<SuperTest.Test>,
+  supertest: SuperTest.Agent,
   updatedRule: RuleUpdateProps
 ): Promise<RuleResponse> =>
   (
diff --git a/x-pack/test/security_solution_api_integration/test_suites/detections_response/utils/telemetry/get_security_telemetry_stats.ts b/x-pack/test/security_solution_api_integration/test_suites/detections_response/utils/telemetry/get_security_telemetry_stats.ts
index 462cdecbb498d..d1345597adc95 100644
--- a/x-pack/test/security_solution_api_integration/test_suites/detections_response/utils/telemetry/get_security_telemetry_stats.ts
+++ b/x-pack/test/security_solution_api_integration/test_suites/detections_response/utils/telemetry/get_security_telemetry_stats.ts
@@ -21,7 +21,7 @@ import {
  * @returns The detection metrics
  */
 export const getSecurityTelemetryStats = async (
-  supertest: SuperTest.SuperTest<SuperTest.Test>,
+  supertest: SuperTest.Agent,
   log: ToolingLog
 ): Promise<any> => {
   const response = await supertest
diff --git a/x-pack/test/security_solution_api_integration/test_suites/entity_analytics/utils/asset_criticality.ts b/x-pack/test/security_solution_api_integration/test_suites/entity_analytics/utils/asset_criticality.ts
index 6f13a84504e1d..3a46aa56ef614 100644
--- a/x-pack/test/security_solution_api_integration/test_suites/entity_analytics/utils/asset_criticality.ts
+++ b/x-pack/test/security_solution_api_integration/test_suites/entity_analytics/utils/asset_criticality.ts
@@ -104,7 +104,7 @@ export const getAssetCriticalityDoc = async (opts: {
 };
 
 export const assetCriticalityRouteHelpersFactory = (
-  supertest: SuperTest.SuperTest<SuperTest.Test>,
+  supertest: SuperTest.Agent,
   namespace?: string
 ) => ({
   status: async () =>
@@ -170,7 +170,7 @@ export const assetCriticalityRouteHelpersFactory = (
 });
 
 export const assetCriticalityRouteHelpersFactoryNoAuth = (
-  supertestWithoutAuth: SuperTest.SuperTest<SuperTest.Test>,
+  supertestWithoutAuth: SuperTest.Agent,
   namespace?: string
 ) => ({
   privilegesForUser: async ({ username, password }: { username: string; password: string }) =>
diff --git a/x-pack/test/security_solution_api_integration/test_suites/entity_analytics/utils/get_risk_engine_stats.ts b/x-pack/test/security_solution_api_integration/test_suites/entity_analytics/utils/get_risk_engine_stats.ts
index 5629e0da9a89d..fd9ff0eb88177 100644
--- a/x-pack/test/security_solution_api_integration/test_suites/entity_analytics/utils/get_risk_engine_stats.ts
+++ b/x-pack/test/security_solution_api_integration/test_suites/entity_analytics/utils/get_risk_engine_stats.ts
@@ -22,7 +22,7 @@ import { getRiskEngineMetricsFromBody } from './get_risk_engine_metrics_from_bod
  * @returns The detection metrics
  */
 export const getRiskEngineStats = async (
-  supertest: SuperTest.SuperTest<SuperTest.Test>,
+  supertest: SuperTest.Agent,
   log: ToolingLog
 ): Promise<RiskEngineMetrics> => {
   const response = await supertest
diff --git a/x-pack/test/security_solution_api_integration/test_suites/entity_analytics/utils/risk_engine.ts b/x-pack/test/security_solution_api_integration/test_suites/entity_analytics/utils/risk_engine.ts
index be7010ab1fc7b..dbd4ed78c1896 100644
--- a/x-pack/test/security_solution_api_integration/test_suites/entity_analytics/utils/risk_engine.ts
+++ b/x-pack/test/security_solution_api_integration/test_suites/entity_analytics/utils/risk_engine.ts
@@ -76,7 +76,7 @@ export const createAndSyncRuleAndAlertsFactory =
     log,
     namespace,
   }: {
-    supertest: SuperTest.SuperTest<SuperTest.Test>;
+    supertest: SuperTest.Agent;
     log: ToolingLog;
     namespace?: string;
   }) =>
@@ -412,7 +412,7 @@ export const clearLegacyDashboards = async ({
   supertest,
   log,
 }: {
-  supertest: SuperTest.SuperTest<SuperTest.Test>;
+  supertest: SuperTest.Agent;
   log: ToolingLog;
 }): Promise<void> => {
   try {
@@ -481,10 +481,7 @@ export const getLegacyRiskScoreDashboards = async ({
   return savedObejectLens?.saved_objects.filter((s) => s?.attributes?.title?.includes('Risk'));
 };
 
-export const riskEngineRouteHelpersFactory = (
-  supertest: SuperTest.SuperTest<SuperTest.Test>,
-  namespace?: string
-) => ({
+export const riskEngineRouteHelpersFactory = (supertest: SuperTest.Agent, namespace?: string) => ({
   init: async (expectStatusCode: number = 200) =>
     await supertest
       .post(routeWithNamespace(RISK_ENGINE_INIT_URL, namespace))
@@ -536,7 +533,7 @@ interface Credentials {
 }
 
 export const riskEngineRouteHelpersFactoryNoAuth = (
-  supertestWithoutAuth: SuperTest.SuperTest<SuperTest.Test>,
+  supertestWithoutAuth: SuperTest.Agent,
   namespace?: string
 ) => ({
   privilegesForUser: async ({ username, password }: Credentials) =>
@@ -576,11 +573,7 @@ export const riskEngineRouteHelpersFactoryNoAuth = (
       .expect(expectStatusCode),
 });
 
-export const installLegacyRiskScore = async ({
-  supertest,
-}: {
-  supertest: SuperTest.SuperTest<SuperTest.Test>;
-}) => {
+export const installLegacyRiskScore = async ({ supertest }: { supertest: SuperTest.Agent }) => {
   await supertest
     .post('/internal/risk_score')
     .set('kbn-xsrf', 'true')
diff --git a/x-pack/test/security_solution_api_integration/test_suites/genai/invoke_ai/utils/create_connector.ts b/x-pack/test/security_solution_api_integration/test_suites/genai/invoke_ai/utils/create_connector.ts
index ac2d60ad631e2..0c7823ef07885 100644
--- a/x-pack/test/security_solution_api_integration/test_suites/genai/invoke_ai/utils/create_connector.ts
+++ b/x-pack/test/security_solution_api_integration/test_suites/genai/invoke_ai/utils/create_connector.ts
@@ -45,7 +45,7 @@ const connectorSetup = {
  * @param spaceId The space id
  */
 export const createConnector = async (
-  supertest: SuperTest.SuperTest<SuperTest.Test>,
+  supertest: SuperTest.Agent,
   objectRemover: ObjectRemover,
   apiUrl: string,
   connectorType: 'bedrock' | 'openai',
diff --git a/x-pack/test/security_solution_api_integration/test_suites/genai/invoke_ai/utils/post_actions_client_execute.ts b/x-pack/test/security_solution_api_integration/test_suites/genai/invoke_ai/utils/post_actions_client_execute.ts
index 0477401a26533..b5ed8c15b3fb2 100644
--- a/x-pack/test/security_solution_api_integration/test_suites/genai/invoke_ai/utils/post_actions_client_execute.ts
+++ b/x-pack/test/security_solution_api_integration/test_suites/genai/invoke_ai/utils/post_actions_client_execute.ts
@@ -21,7 +21,7 @@ import { Response } from 'superagent';
 export const postActionsClientExecute = async (
   connectorId: string,
   args: any,
-  supertest: SuperTest.SuperTest<SuperTest.Test>
+  supertest: SuperTest.Agent
 ): Promise<Response> => {
   const response = await supertest
     .post(`/internal/elastic_assistant/actions/connector/${connectorId}/_execute`)
diff --git a/x-pack/test/security_solution_api_integration/test_suites/investigation/saved_objects/trial_license_complete_tier/helpers.ts b/x-pack/test/security_solution_api_integration/test_suites/investigation/saved_objects/trial_license_complete_tier/helpers.ts
index 38212020ba18a..1f1a4bb821082 100644
--- a/x-pack/test/security_solution_api_integration/test_suites/investigation/saved_objects/trial_license_complete_tier/helpers.ts
+++ b/x-pack/test/security_solution_api_integration/test_suites/investigation/saved_objects/trial_license_complete_tier/helpers.ts
@@ -9,10 +9,7 @@ import type SuperTest from 'supertest';
 import { v4 as uuidv4 } from 'uuid';
 import { TimelineType } from '@kbn/security-solution-plugin/common/api/timeline';
 
-export const createBasicTimeline = async (
-  supertest: SuperTest.SuperTest<SuperTest.Test>,
-  titleToSaved: string
-) =>
+export const createBasicTimeline = async (supertest: SuperTest.Agent, titleToSaved: string) =>
   await supertest
     .post('/api/timeline')
     .set('kbn-xsrf', 'true')
@@ -25,7 +22,7 @@ export const createBasicTimeline = async (
     });
 
 export const createBasicTimelineTemplate = async (
-  supertest: SuperTest.SuperTest<SuperTest.Test>,
+  supertest: SuperTest.Agent,
   titleToSaved: string
 ) =>
   await supertest
diff --git a/x-pack/test/security_solution_api_integration/test_suites/lists_and_exception_lists/utils.ts b/x-pack/test/security_solution_api_integration/test_suites/lists_and_exception_lists/utils.ts
index d45a77be0840b..c4bde53fcab7d 100644
--- a/x-pack/test/security_solution_api_integration/test_suites/lists_and_exception_lists/utils.ts
+++ b/x-pack/test/security_solution_api_integration/test_suites/lists_and_exception_lists/utils.ts
@@ -41,7 +41,7 @@ import { countDownTest } from '../../../common/utils/security_solution';
  * @param supertest The supertest client library
  */
 export const createListsIndex = async (
-  supertest: SuperTest.SuperTest<SuperTest.Test>,
+  supertest: SuperTest.Agent,
   log: ToolingLog
 ): Promise<void> => {
   return countDownTest(
@@ -61,7 +61,7 @@ export const createListsIndex = async (
  * @param supertest The supertest client library
  */
 export const deleteListsIndex = async (
-  supertest: SuperTest.SuperTest<SuperTest.Test>,
+  supertest: SuperTest.Agent,
   log: ToolingLog
 ): Promise<void> => {
   return countDownTest(
@@ -82,7 +82,7 @@ export const deleteListsIndex = async (
  * @param supertest The supertest client library
  */
 export const createExceptionListsIndex = async (
-  supertest: SuperTest.SuperTest<SuperTest.Test>,
+  supertest: SuperTest.Agent,
   log: ToolingLog
 ): Promise<void> => {
   return countDownTest(
@@ -205,7 +205,7 @@ export const binaryToString = (res: any, callback: any): void => {
  * @param supertest The supertest handle
  */
 export const deleteAllExceptions = async (
-  supertest: SuperTest.SuperTest<SuperTest.Test>,
+  supertest: SuperTest.Agent,
   log: ToolingLog
 ): Promise<void> => {
   await deleteAllExceptionsByType(supertest, log, 'single');
@@ -218,7 +218,7 @@ export const deleteAllExceptions = async (
  * @param supertest The supertest handle
  */
 export const deleteAllExceptionsByType = async (
-  supertest: SuperTest.SuperTest<SuperTest.Test>,
+  supertest: SuperTest.Agent,
   log: ToolingLog,
   type: NamespaceType
 ): Promise<void> => {
@@ -260,7 +260,7 @@ export const deleteAllExceptionsByType = async (
  * @param testValues Optional test values in case you're using CIDR or range based lists
  */
 export const importFile = async (
-  supertest: SuperTest.SuperTest<SuperTest.Test>,
+  supertest: SuperTest.Agent,
   log: ToolingLog,
   type: Type,
   contents: string[],
@@ -297,7 +297,7 @@ export const importFile = async (
  * @param fileName filename to import as
  */
 export const importTextFile = async (
-  supertest: SuperTest.SuperTest<SuperTest.Test>,
+  supertest: SuperTest.Agent,
   log: ToolingLog,
   type: Type,
   contents: string[],
@@ -330,7 +330,7 @@ export const importTextFile = async (
  * @param itemValue The item value to wait for
  */
 export const waitForListItem = async (
-  supertest: SuperTest.SuperTest<SuperTest.Test>,
+  supertest: SuperTest.Agent,
   log: ToolingLog,
   itemValue: string,
   fileName: string
@@ -362,7 +362,7 @@ export const waitForListItem = async (
  * @param itemValue The item value to wait for
  */
 export const waitForListItems = async (
-  supertest: SuperTest.SuperTest<SuperTest.Test>,
+  supertest: SuperTest.Agent,
   log: ToolingLog,
   itemValues: string[],
   fileName: string
@@ -378,7 +378,7 @@ export const waitForListItems = async (
  * @param itemValue The item value to wait for
  */
 export const waitForTextListItem = async (
-  supertest: SuperTest.SuperTest<SuperTest.Test>,
+  supertest: SuperTest.Agent,
   log: ToolingLog,
   itemValue: string,
   fileName: string
@@ -417,7 +417,7 @@ export const waitForTextListItem = async (
  * @param itemValue The item value to wait for
  */
 export const waitForTextListItems = async (
-  supertest: SuperTest.SuperTest<SuperTest.Test>,
+  supertest: SuperTest.Agent,
   log: ToolingLog,
   itemValues: string[],
   fileName: string
diff --git a/x-pack/test/spaces_api_integration/common/lib/create_users_and_roles.ts b/x-pack/test/spaces_api_integration/common/lib/create_users_and_roles.ts
index 15ee9785aa690..58ef5ba9f9481 100644
--- a/x-pack/test/spaces_api_integration/common/lib/create_users_and_roles.ts
+++ b/x-pack/test/spaces_api_integration/common/lib/create_users_and_roles.ts
@@ -5,11 +5,11 @@
  * 2.0.
  */
 
-import { SuperTest } from 'supertest';
+import { Agent as SuperTestAgent } from 'supertest';
 import type { Client } from '@elastic/elasticsearch';
 import { AUTHENTICATION } from './authentication';
 
-export const createUsersAndRoles = async (es: Client, supertest: SuperTest<any>) => {
+export const createUsersAndRoles = async (es: Client, supertest: SuperTestAgent) => {
   await supertest
     .put('/api/security/role/kibana_legacy_user')
     .send({
diff --git a/x-pack/test/spaces_api_integration/common/suites/disable_legacy_url_aliases.ts b/x-pack/test/spaces_api_integration/common/suites/disable_legacy_url_aliases.ts
index 002ed6c3e6515..5889a10479f31 100644
--- a/x-pack/test/spaces_api_integration/common/suites/disable_legacy_url_aliases.ts
+++ b/x-pack/test/spaces_api_integration/common/suites/disable_legacy_url_aliases.ts
@@ -6,7 +6,7 @@
  */
 
 import expect from '@kbn/expect';
-import type { SuperTest } from 'supertest';
+import type { Agent as SuperTestAgent } from 'supertest';
 import type { Client } from '@elastic/elasticsearch';
 import type { LegacyUrlAlias } from '@kbn/core-saved-objects-base-server-internal';
 import { MAIN_SAVED_OBJECT_INDEX } from '@kbn/core-saved-objects-server';
@@ -48,7 +48,7 @@ const getTestTitle = ({ targetSpace, targetType, sourceId }: DisableLegacyUrlAli
 export function disableLegacyUrlAliasesTestSuiteFactory(
   es: Client,
   esArchiver: any,
-  supertest: SuperTest<any>
+  supertest: SuperTestAgent
 ) {
   const expectResponseBody =
     (testCase: DisableLegacyUrlAliasesTestCase, statusCode: 204 | 403): ExpectResponseBody =>
@@ -117,7 +117,7 @@ export function disableLegacyUrlAliasesTestSuiteFactory(
             const requestBody = test.request;
             await supertest
               .post(`${getUrlPrefix(spaceId)}/api/spaces/_disable_legacy_url_aliases`)
-              .auth(user?.username, user?.password)
+              .auth(user?.username!, user?.password!)
               .send(requestBody)
               .expect(test.responseStatusCode)
               .then(test.responseBody);
diff --git a/x-pack/test/spaces_api_integration/common/suites/get_shareable_references.ts b/x-pack/test/spaces_api_integration/common/suites/get_shareable_references.ts
index bedc8a52409b6..c1630bc288169 100644
--- a/x-pack/test/spaces_api_integration/common/suites/get_shareable_references.ts
+++ b/x-pack/test/spaces_api_integration/common/suites/get_shareable_references.ts
@@ -7,7 +7,7 @@
 
 import expect from '@kbn/expect';
 import { deepFreeze } from '@kbn/std';
-import { SuperTest } from 'supertest';
+import { Agent as SuperTestAgent } from 'supertest';
 import {
   SavedObjectsCollectMultiNamespaceReferencesResponse,
   SavedObjectReferenceWithContext,
@@ -192,7 +192,7 @@ const getRedactedSpaces = (authorizedSpace: string | undefined, spaces: string[]
   return redactedSpaces.sort((a, b) => (a === '?' ? 1 : b === '?' ? -1 : 0)); // unknown spaces are always at the end of the array
 };
 
-export function getShareableReferencesTestSuiteFactory(esArchiver: any, supertest: SuperTest<any>) {
+export function getShareableReferencesTestSuiteFactory(esArchiver: any, supertest: SuperTestAgent) {
   const expectForbidden = expectResponses.forbiddenTypes('share_to_space');
   const expectResponseBody =
     (
@@ -274,7 +274,7 @@ export function getShareableReferencesTestSuiteFactory(esArchiver: any, supertes
             const requestBody = test.request;
             await supertest
               .post(`${getUrlPrefix(spaceId)}/api/spaces/_get_shareable_references`)
-              .auth(user?.username, user?.password)
+              .auth(user?.username!, user?.password!)
               .send(requestBody)
               .expect(test.responseStatusCode)
               .then(test.responseBody);
diff --git a/x-pack/test/spaces_api_integration/common/suites/update_objects_spaces.ts b/x-pack/test/spaces_api_integration/common/suites/update_objects_spaces.ts
index 14eb97c38c6ee..777581d9aa5a0 100644
--- a/x-pack/test/spaces_api_integration/common/suites/update_objects_spaces.ts
+++ b/x-pack/test/spaces_api_integration/common/suites/update_objects_spaces.ts
@@ -9,7 +9,7 @@ import expect from '@kbn/expect';
 import type { Client } from '@elastic/elasticsearch';
 import type { SearchTotalHits } from '@elastic/elasticsearch/lib/api/types';
 import { without, uniq } from 'lodash';
-import { SuperTest } from 'supertest';
+import { Agent as SuperTestAgent } from 'supertest';
 import {
   SavedObjectsErrorHelpers,
   SavedObjectsUpdateObjectsSpacesResponse,
@@ -61,7 +61,7 @@ const getTestTitle = ({ objects, spacesToAdd, spacesToRemove }: UpdateObjectsSpa
 export function updateObjectsSpacesTestSuiteFactory(
   es: Client,
   esArchiver: any,
-  supertest: SuperTest<any>
+  supertest: SuperTestAgent
 ) {
   const expectForbidden = expectResponses.forbiddenTypes('share_to_space');
   const expectResponseBody =
@@ -162,7 +162,7 @@ export function updateObjectsSpacesTestSuiteFactory(
             const requestBody = test.request;
             await supertest
               .post(`${getUrlPrefix(spaceId)}/api/spaces/_update_objects_spaces`)
-              .auth(user?.username, user?.password)
+              .auth(user?.username!, user?.password!)
               .send(requestBody)
               .expect(test.responseStatusCode)
               .then(test.responseBody);
diff --git a/x-pack/test_serverless/api_integration/services/svl_cases/api.ts b/x-pack/test_serverless/api_integration/services/svl_cases/api.ts
index 8f23eba1ea981..7089655551fbe 100644
--- a/x-pack/test_serverless/api_integration/services/svl_cases/api.ts
+++ b/x-pack/test_serverless/api_integration/services/svl_cases/api.ts
@@ -141,7 +141,7 @@ export function SvlCasesApiServiceProvider({ getService }: FtrProviderContext) {
       params: CasePostRequest,
       expectedHttpCode: number = 200,
       auth: { user: User; space: string | null } | null = { user: superUser, space: null },
-      headers: Record<string, unknown> = {}
+      headers: Record<string, string | string[]> = {}
     ): Promise<Case> {
       const apiCall = supertest.post(`${CASES_URL}`);
 
diff --git a/x-pack/test_serverless/api_integration/services/transform/api.ts b/x-pack/test_serverless/api_integration/services/transform/api.ts
index 39c2d01c6adb1..c865dcec6e8a0 100644
--- a/x-pack/test_serverless/api_integration/services/transform/api.ts
+++ b/x-pack/test_serverless/api_integration/services/transform/api.ts
@@ -217,7 +217,7 @@ export function TransformAPIProvider({ getService }: FtrProviderContext) {
         );
         const { body, status } = await esSupertest
           .put(`/_transform/${transformId}${deferValidation ? '?defer_validation=true' : ''}`)
-          .set(headers)
+          .set(headers as Record<string, string>)
           .send(transformConfig);
         this.assertResponseStatusCode(200, status, body);
       } else {
diff --git a/x-pack/test_serverless/api_integration/test_suites/common/alerting/helpers/alerting_api_helper.ts b/x-pack/test_serverless/api_integration/test_suites/common/alerting/helpers/alerting_api_helper.ts
index bd8c64bed6731..88f3f1a76d3bb 100644
--- a/x-pack/test_serverless/api_integration/test_suites/common/alerting/helpers/alerting_api_helper.ts
+++ b/x-pack/test_serverless/api_integration/test_suites/common/alerting/helpers/alerting_api_helper.ts
@@ -6,7 +6,7 @@
  */
 
 import moment from 'moment';
-import type { SuperTest, Test } from 'supertest';
+import type { Agent as SuperTestAgent } from 'supertest';
 
 interface CreateEsQueryRuleParams {
   size: number;
@@ -32,7 +32,7 @@ export async function createIndexConnector({
   name,
   indexName,
 }: {
-  supertest: SuperTest<Test>;
+  supertest: SuperTestAgent;
   name: string;
   indexName: string;
 }) {
@@ -56,7 +56,7 @@ export async function createSlackConnector({
   supertest,
   name,
 }: {
-  supertest: SuperTest<Test>;
+  supertest: SuperTestAgent;
   name: string;
 }) {
   const { body } = await supertest
@@ -87,7 +87,7 @@ export async function createEsQueryRule({
   notifyWhen,
   enabled = true,
 }: {
-  supertest: SuperTest<Test>;
+  supertest: SuperTestAgent;
   ruleTypeId: string;
   name: string;
   params: CreateEsQueryRuleParams;
@@ -134,7 +134,7 @@ export async function createAnomalyRule({
   ruleTypeId = 'apm.anomaly',
   params,
 }: {
-  supertest: SuperTest<Test>;
+  supertest: SuperTestAgent;
   name?: string;
   consumer?: string;
   actions?: any[];
@@ -184,7 +184,7 @@ export async function createLatencyThresholdRule({
   ruleTypeId = 'apm.transaction_duration',
   params,
 }: {
-  supertest: SuperTest<Test>;
+  supertest: SuperTestAgent;
   name?: string;
   consumer?: string;
   actions?: any[];
@@ -233,7 +233,7 @@ export async function createInventoryRule({
   ruleTypeId = 'metrics.alert.inventory.threshold',
   params,
 }: {
-  supertest: SuperTest<Test>;
+  supertest: SuperTestAgent;
   name?: string;
   consumer?: string;
   actions?: any[];
@@ -287,7 +287,7 @@ export async function disableRule({
   supertest,
   ruleId,
 }: {
-  supertest: SuperTest<Test>;
+  supertest: SuperTestAgent;
   ruleId: string;
 }) {
   const { body } = await supertest
@@ -303,7 +303,7 @@ export async function updateEsQueryRule({
   ruleId,
   updates,
 }: {
-  supertest: SuperTest<Test>;
+  supertest: SuperTestAgent;
   ruleId: string;
   updates: any;
 }) {
@@ -341,7 +341,7 @@ export async function runRule({
   supertest,
   ruleId,
 }: {
-  supertest: SuperTest<Test>;
+  supertest: SuperTestAgent;
   ruleId: string;
 }) {
   const response = await supertest
@@ -356,7 +356,7 @@ export async function muteRule({
   supertest,
   ruleId,
 }: {
-  supertest: SuperTest<Test>;
+  supertest: SuperTestAgent;
   ruleId: string;
 }) {
   const { body } = await supertest
@@ -371,7 +371,7 @@ export async function enableRule({
   supertest,
   ruleId,
 }: {
-  supertest: SuperTest<Test>;
+  supertest: SuperTestAgent;
   ruleId: string;
 }) {
   const { body } = await supertest
@@ -387,7 +387,7 @@ export async function muteAlert({
   ruleId,
   alertId,
 }: {
-  supertest: SuperTest<Test>;
+  supertest: SuperTestAgent;
   ruleId: string;
   alertId: string;
 }) {
@@ -403,7 +403,7 @@ export async function unmuteRule({
   supertest,
   ruleId,
 }: {
-  supertest: SuperTest<Test>;
+  supertest: SuperTestAgent;
   ruleId: string;
 }) {
   const { body } = await supertest
@@ -418,7 +418,7 @@ export async function snoozeRule({
   supertest,
   ruleId,
 }: {
-  supertest: SuperTest<Test>;
+  supertest: SuperTestAgent;
   ruleId: string;
 }) {
   const { body } = await supertest
@@ -443,7 +443,7 @@ export async function findRule({
   supertest,
   ruleId,
 }: {
-  supertest: SuperTest<Test>;
+  supertest: SuperTestAgent;
   ruleId: string;
 }) {
   if (!ruleId) {
diff --git a/x-pack/test_serverless/api_integration/test_suites/common/alerting/helpers/alerting_wait_for_helpers.ts b/x-pack/test_serverless/api_integration/test_suites/common/alerting/helpers/alerting_wait_for_helpers.ts
index 00b746697cd23..55bfa422c5f4b 100644
--- a/x-pack/test_serverless/api_integration/test_suites/common/alerting/helpers/alerting_wait_for_helpers.ts
+++ b/x-pack/test_serverless/api_integration/test_suites/common/alerting/helpers/alerting_wait_for_helpers.ts
@@ -6,7 +6,7 @@
  */
 
 import pRetry from 'p-retry';
-import type { SuperTest, Test } from 'supertest';
+import type { Agent as SuperTestAgent } from 'supertest';
 import type { Client } from '@elastic/elasticsearch';
 import type {
   AggregationsAggregate,
@@ -372,7 +372,7 @@ export async function waitForNumRuleRuns({
   esClient,
   testStart,
 }: {
-  supertest: SuperTest<Test>;
+  supertest: SuperTestAgent;
   numOfRuns: number;
   ruleId: string;
   esClient: Client;
diff --git a/x-pack/test_serverless/api_integration/test_suites/observability/apm_api_integration/common/apm_api_supertest.ts b/x-pack/test_serverless/api_integration/test_suites/observability/apm_api_integration/common/apm_api_supertest.ts
index ac324b3fda087..62db8c2eddda4 100644
--- a/x-pack/test_serverless/api_integration/test_suites/observability/apm_api_integration/common/apm_api_supertest.ts
+++ b/x-pack/test_serverless/api_integration/test_suites/observability/apm_api_integration/common/apm_api_supertest.ts
@@ -16,7 +16,7 @@ import type { APIEndpoint } from '@kbn/apm-plugin/server';
 import { formatRequest } from '@kbn/server-route-repository';
 import { InheritedFtrProviderContext } from '../../../../services';
 
-export function createApmApiClient(st: supertest.SuperTest<supertest.Test>) {
+export function createApmApiClient(st: supertest.Agent) {
   return async <TEndpoint extends APIEndpoint>(
     options: {
       type?: 'form-data';
diff --git a/x-pack/test_serverless/api_integration/test_suites/observability/dataset_quality_api_integration/common/dataset_quality_api_supertest.ts b/x-pack/test_serverless/api_integration/test_suites/observability/dataset_quality_api_integration/common/dataset_quality_api_supertest.ts
index 2cdb6ec4fd765..f1d746b49ff06 100644
--- a/x-pack/test_serverless/api_integration/test_suites/observability/dataset_quality_api_integration/common/dataset_quality_api_supertest.ts
+++ b/x-pack/test_serverless/api_integration/test_suites/observability/dataset_quality_api_integration/common/dataset_quality_api_supertest.ts
@@ -13,7 +13,7 @@ import type { APIEndpoint } from '@kbn/dataset-quality-plugin/server/routes';
 import { formatRequest } from '@kbn/server-route-repository';
 import { InheritedFtrProviderContext } from '../../../../services';
 
-export function createDatasetQualityApiClient(st: supertest.SuperTest<supertest.Test>) {
+export function createDatasetQualityApiClient(st: supertest.Agent) {
   return async <TEndpoint extends APIEndpoint>(
     options: {
       type?: 'form-data';
diff --git a/x-pack/test_serverless/api_integration/test_suites/observability/synthetics/synthetics_enablement.ts b/x-pack/test_serverless/api_integration/test_suites/observability/synthetics/synthetics_enablement.ts
index fae09f97cf2a2..9925c00fe5748 100644
--- a/x-pack/test_serverless/api_integration/test_suites/observability/synthetics/synthetics_enablement.ts
+++ b/x-pack/test_serverless/api_integration/test_suites/observability/synthetics/synthetics_enablement.ts
@@ -65,7 +65,7 @@ export default function ({ getService }: FtrProviderContext) {
     async function enablementPut(role: RoleName = 'admin', expectedStatus: number = 200) {
       return supertestWithoutAuth
         .put(SYNTHETICS_API_URLS.SYNTHETICS_ENABLEMENT)
-        .set(internalRequestHeader)
+        .set(internalRequestHeader as unknown as Record<string, string>)
         .set(await svlUserManager.getApiCredentialsForRole(role))
         .expect(expectedStatus);
     }
@@ -73,7 +73,7 @@ export default function ({ getService }: FtrProviderContext) {
     async function enablementDelete(role: RoleName = 'admin', expectedStatus: number = 200) {
       return supertestWithoutAuth
         .delete(SYNTHETICS_API_URLS.SYNTHETICS_ENABLEMENT)
-        .set(internalRequestHeader)
+        .set(internalRequestHeader as unknown as Record<string, string>)
         .set(await svlUserManager.getApiCredentialsForRole(role))
         .expect(expectedStatus);
     }
diff --git a/x-pack/test_serverless/shared/lib/object_remover.ts b/x-pack/test_serverless/shared/lib/object_remover.ts
index ad029ca579cbd..ef43c70d0ee49 100644
--- a/x-pack/test_serverless/shared/lib/object_remover.ts
+++ b/x-pack/test_serverless/shared/lib/object_remover.ts
@@ -5,7 +5,7 @@
  * 2.0.
  */
 
-import { SuperTest, Test } from 'supertest';
+import { Agent as SuperTestAgent } from 'supertest';
 
 import { getUrlPathPrefixForSpace } from './space_path_prefix';
 
@@ -18,10 +18,10 @@ interface ObjectToRemove {
 }
 
 export class ObjectRemover {
-  private readonly supertest: SuperTest<Test>;
+  private readonly supertest: SuperTestAgent;
   private objectsToRemove: ObjectToRemove[] = [];
 
-  constructor(supertest: SuperTest<Test>) {
+  constructor(supertest: SuperTestAgent) {
     this.supertest = supertest;
   }
 
@@ -60,7 +60,7 @@ export class ObjectRemover {
 }
 
 interface DeleteObjectParams {
-  supertest: SuperTest<Test>;
+  supertest: SuperTestAgent;
   url: string;
   plugin: string;
 }
diff --git a/x-pack/test_serverless/shared/services/bsearch_secure.ts b/x-pack/test_serverless/shared/services/bsearch_secure.ts
index 2493c1d76e09c..14a373ab99686 100644
--- a/x-pack/test_serverless/shared/services/bsearch_secure.ts
+++ b/x-pack/test_serverless/shared/services/bsearch_secure.ts
@@ -25,7 +25,7 @@ const parseBfetchResponse = (resp: request.Response): Array<Record<string, any>>
 };
 
 interface SendOptions {
-  supertestWithoutAuth: SuperTest.SuperTest<SuperTest.Test>;
+  supertestWithoutAuth: SuperTest.Agent;
   apiKeyHeader: { Authorization: string };
   referer?: string;
   kibanaVersion?: string;
diff --git a/yarn.lock b/yarn.lock
index cf2d9e2fb8052..195b869f022c5 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -9555,10 +9555,10 @@
   dependencies:
     "@types/node" "*"
 
-"@types/cookiejar@*":
-  version "2.1.2"
-  resolved "https://registry.yarnpkg.com/@types/cookiejar/-/cookiejar-2.1.2.tgz#66ad9331f63fe8a3d3d9d8c6e3906dd10f6446e8"
-  integrity sha512-t73xJJrvdTjXrn4jLS9VSGRbz0nUY3cl2DMGDU48lKl+HR9dbbjW2A9r3g40VA++mQpy6uuHg33gy7du2BKpog==
+"@types/cookiejar@^2.1.5":
+  version "2.1.5"
+  resolved "https://registry.yarnpkg.com/@types/cookiejar/-/cookiejar-2.1.5.tgz#14a3e83fa641beb169a2dd8422d91c3c345a9a78"
+  integrity sha512-he+DHOWReW0nghN24E1WUqM0efK4kI9oTqDm6XmK8ZPe2djZ90BSNdGnIyCLzCPw7/pogPlGbzI2wHGGmi4O/Q==
 
 "@types/cytoscape@^3.14.0":
   version "3.14.0"
@@ -10163,6 +10163,11 @@
   resolved "https://registry.yarnpkg.com/@types/mdurl/-/mdurl-1.0.2.tgz#e2ce9d83a613bacf284c7be7d491945e39e1f8e9"
   integrity sha512-eC4U9MlIcu2q0KQmXszyn5Akca/0jrQmwDRgpAMJai7qBWq4amIQhZyNau4VYGtCeALvW1/NtjzJJ567aZxfKA==
 
+"@types/methods@^1.1.4":
+  version "1.1.4"
+  resolved "https://registry.yarnpkg.com/@types/methods/-/methods-1.1.4.tgz#d3b7ac30ac47c91054ea951ce9eed07b1051e547"
+  integrity sha512-ymXWVrDiCxTBE3+RIrrP533E70eA+9qu7zdWoHuOmGujkYtzf4HQF96b8nwHLqhuf4ykX61IGRIB38CC6/sImQ==
+
 "@types/micromatch@^4.0.2":
   version "4.0.2"
   resolved "https://registry.yarnpkg.com/@types/micromatch/-/micromatch-4.0.2.tgz#ce29c8b166a73bf980a5727b1e4a4d099965151d"
@@ -10701,20 +10706,22 @@
   resolved "https://registry.yarnpkg.com/@types/stylis/-/stylis-4.2.0.tgz#199a3f473f0c3a6f6e4e1b17cdbc967f274bdc6b"
   integrity sha512-n4sx2bqL0mW1tvDf/loQ+aMX7GQD3lc3fkCMC55VFNDu/vBOabO+LTIeXKM14xK0ppk5TUGcWRjiSpIlUpghKw==
 
-"@types/superagent@*":
-  version "3.8.4"
-  resolved "https://registry.yarnpkg.com/@types/superagent/-/superagent-3.8.4.tgz#24a5973c7d1a9c024b4bbda742a79267c33fb86a"
-  integrity sha512-Dnh0Iw6NO55z1beXvlsvUrfk4cd9eL2nuTmUk+rAhSVCk10PGGFbqCCTwbau9D0d2W3DITiXl4z8VCqppGkMPQ==
+"@types/superagent@^8.1.0":
+  version "8.1.7"
+  resolved "https://registry.yarnpkg.com/@types/superagent/-/superagent-8.1.7.tgz#1153819ed4db34427409a1cc58f3e2f13eeec862"
+  integrity sha512-NmIsd0Yj4DDhftfWvvAku482PZum4DBW7U51OvS8gvOkDDY0WT1jsVyDV3hK+vplrsYw8oDwi9QxOM7U68iwww==
   dependencies:
-    "@types/cookiejar" "*"
+    "@types/cookiejar" "^2.1.5"
+    "@types/methods" "^1.1.4"
     "@types/node" "*"
 
-"@types/supertest@^2.0.12":
-  version "2.0.12"
-  resolved "https://registry.yarnpkg.com/@types/supertest/-/supertest-2.0.12.tgz#ddb4a0568597c9aadff8dbec5b2e8fddbe8692fc"
-  integrity sha512-X3HPWTwXRerBZS7Mo1k6vMVR1Z6zmJcDVn5O/31whe0tnjE4te6ZJSJGq1RiqHPjzPdMTfjCFogDJmwng9xHaQ==
+"@types/supertest@^6.0.2":
+  version "6.0.2"
+  resolved "https://registry.yarnpkg.com/@types/supertest/-/supertest-6.0.2.tgz#2af1c466456aaf82c7c6106c6b5cbd73a5e86588"
+  integrity sha512-137ypx2lk/wTQbW6An6safu9hXmajAifU/s7szAHLN/FeIm5w7yR0Wkl9fdJMRSHwOn4HLAI0DaB2TOORuhPDg==
   dependencies:
-    "@types/superagent" "*"
+    "@types/methods" "^1.1.4"
+    "@types/superagent" "^8.1.0"
 
 "@types/tapable@^1", "@types/tapable@^1.0.5", "@types/tapable@^1.0.6":
   version "1.0.6"
@@ -17726,15 +17733,14 @@ formdata-polyfill@^4.0.10:
   dependencies:
     fetch-blob "^3.1.2"
 
-formidable@^2.1.2:
-  version "2.1.2"
-  resolved "https://registry.yarnpkg.com/formidable/-/formidable-2.1.2.tgz#fa973a2bec150e4ce7cac15589d7a25fc30ebd89"
-  integrity sha512-CM3GuJ57US06mlpQ47YcunuUZ9jpm8Vx+P2CGt2j7HpgkKZO/DJYQ0Bobim8G6PFQmK5lOqOOdUXboU+h73A4g==
+formidable@^3.5.1:
+  version "3.5.1"
+  resolved "https://registry.yarnpkg.com/formidable/-/formidable-3.5.1.tgz#9360a23a656f261207868b1484624c4c8d06ee1a"
+  integrity sha512-WJWKelbRHN41m5dumb0/k8TeAx7Id/y3a+Z7QfhxP/htI9Js5zYaEDtG8uMgG0vM0lOlqnmjE99/kfpOYi/0Og==
   dependencies:
     dezalgo "^1.0.4"
     hexoid "^1.0.0"
     once "^1.4.0"
-    qs "^6.11.0"
 
 formik@^2.4.5:
   version "2.4.5"
@@ -27655,7 +27661,7 @@ semver@7.5.4:
   dependencies:
     lru-cache "^6.0.0"
 
-semver@7.6.0, semver@^7.3.2, semver@^7.3.4, semver@^7.3.5, semver@^7.3.7, semver@^7.3.8, semver@^7.5.0, semver@^7.5.2, semver@^7.5.3, semver@^7.5.4:
+semver@7.6.0, semver@^7.3.2, semver@^7.3.4, semver@^7.3.5, semver@^7.3.7, semver@^7.5.0, semver@^7.5.2, semver@^7.5.3, semver@^7.5.4:
   version "7.6.0"
   resolved "https://registry.yarnpkg.com/semver/-/semver-7.6.0.tgz#1a46a4db4bffcccd97b743b5005c8325f23d4e2d"
   integrity sha512-EnwXhrlwXMk9gKu5/flx5sv/an57AkRplG3hTK68W7FRDN+k+OWBj65M7719OkA82XLBxrcX0KSHj+X5COhOVg==
@@ -29098,21 +29104,20 @@ stylus-lookup@^5.0.1:
   dependencies:
     commander "^10.0.1"
 
-superagent@^8.0.5, superagent@^8.1.2:
-  version "8.1.2"
-  resolved "https://registry.yarnpkg.com/superagent/-/superagent-8.1.2.tgz#03cb7da3ec8b32472c9d20f6c2a57c7f3765f30b"
-  integrity sha512-6WTxW1EB6yCxV5VFOIPQruWGHqc3yI7hEmZK6h+pyk69Lk/Ut7rLUY6W/ONF2MjBuGjvmMiIpsrVJ2vjrHlslA==
+superagent@^9.0.1, superagent@^9.0.2:
+  version "9.0.2"
+  resolved "https://registry.yarnpkg.com/superagent/-/superagent-9.0.2.tgz#a18799473fc57557289d6b63960610e358bdebc1"
+  integrity sha512-xuW7dzkUpcJq7QnhOsnNUgtYp3xRwpt2F7abdRYIpCsAt0hhUqia0EdxyXZQQpNmGtsCzYHryaKSV3q3GJnq7w==
   dependencies:
     component-emitter "^1.3.0"
     cookiejar "^2.1.4"
     debug "^4.3.4"
     fast-safe-stringify "^2.1.1"
     form-data "^4.0.0"
-    formidable "^2.1.2"
+    formidable "^3.5.1"
     methods "^1.1.2"
     mime "2.6.0"
     qs "^6.11.0"
-    semver "^7.3.8"
 
 supercluster@^8.0.1:
   version "8.0.1"
@@ -29128,13 +29133,13 @@ superjson@^1.10.0:
   dependencies:
     copy-anything "^3.0.2"
 
-supertest@^6.3.3:
-  version "6.3.3"
-  resolved "https://registry.yarnpkg.com/supertest/-/supertest-6.3.3.tgz#42f4da199fee656106fd422c094cf6c9578141db"
-  integrity sha512-EMCG6G8gDu5qEqRQ3JjjPs6+FYT1a7Hv5ApHvtSghmOFJYtsU5S+pSb6Y2EUeCEY3CmEL3mmQ8YWlPOzQomabA==
+supertest@^7.0.0:
+  version "7.0.0"
+  resolved "https://registry.yarnpkg.com/supertest/-/supertest-7.0.0.tgz#cac53b3d6872a0b317980b2b0cfa820f09cd7634"
+  integrity sha512-qlsr7fIC0lSddmA3tzojvzubYxvlGtzumcdHgPwbFWMISQwL22MhM2Y3LNt+6w9Yyx7559VW5ab70dgphm8qQA==
   dependencies:
     methods "^1.1.2"
-    superagent "^8.0.5"
+    superagent "^9.0.1"
 
 supports-color@8.1.1, supports-color@^8.0.0, supports-color@^8.1.1:
   version "8.1.1"