diff --git a/playwright/e2e/settings/device-management.spec.ts b/playwright/e2e/settings/device-management.spec.ts
index 4c1169ad094..949ce582e3a 100644
--- a/playwright/e2e/settings/device-management.spec.ts
+++ b/playwright/e2e/settings/device-management.spec.ts
@@ -7,7 +7,10 @@ Please see LICENSE files in the repository root for full details.
 */
 
 import { test, expect } from "../../element-web-test";
+import { uiaLongSessionTimeoutHomeserver } from "../../plugins/homeserver/synapse/uiaLongSessionTimeoutHomeserver.ts";
 
+// This is needed to not get stopped by UIA when deleting other devices
+test.use(uiaLongSessionTimeoutHomeserver);
 test.describe("Device manager", () => {
     test.use({
         displayName: "Alice",
diff --git a/playwright/plugins/homeserver/synapse/uiaLongSessionTimeoutHomeserver.ts b/playwright/plugins/homeserver/synapse/uiaLongSessionTimeoutHomeserver.ts
new file mode 100644
index 00000000000..1a0e41a71f7
--- /dev/null
+++ b/playwright/plugins/homeserver/synapse/uiaLongSessionTimeoutHomeserver.ts
@@ -0,0 +1,24 @@
+/*
+Copyright 2024 New Vector Ltd.
+
+SPDX-License-Identifier: AGPL-3.0-only OR GPL-3.0-only OR LicenseRef-Element-Commercial
+Please see LICENSE files in the repository root for full details.
+*/
+
+import { Fixtures } from "@playwright/test";
+
+import { Services } from "../../../services.ts";
+
+export const uiaLongSessionTimeoutHomeserver: Fixtures<{}, Services> = {
+    synapseConfigOptions: [
+        async ({ synapseConfigOptions }, use) => {
+            await use({
+                ...synapseConfigOptions,
+                ui_auth: {
+                    session_timeout: "300s",
+                },
+            });
+        },
+        { scope: "worker" },
+    ],
+};
diff --git a/playwright/testcontainers/synapse.ts b/playwright/testcontainers/synapse.ts
index 3b06db2325e..084ea480051 100644
--- a/playwright/testcontainers/synapse.ts
+++ b/playwright/testcontainers/synapse.ts
@@ -118,9 +118,7 @@ const DEFAULT_CONFIG = {
     password_config: {
         enabled: true,
     },
-    ui_auth: {
-        session_timeout: "300s",
-    },
+    ui_auth: {},
     background_updates: {
         // Inhibit background updates as this Synapse isn't long-lived
         min_batch_size: 100000,