diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index f2c81e0a1..635d56fd9 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -2,10 +2,10 @@ name: Rollbar.js CI
 
 on:
   push:
-    branches: [ master ]
-    tags: [ v* ]
+    branches: [master]
+    tags: [v*]
   pull_request:
-    branches: [ master ]
+    branches: [master]
 
 jobs:
   build:
@@ -15,15 +15,15 @@ jobs:
       matrix:
         include:
           - node: 14
-            npm: 8
+            npm: ^8
           - node: 16
-            npm: 8
+            npm: ^8
           - node: 18
-            npm: 9
+            npm: ^9
           - node: 20
-            npm: 10
-          - node: 21
-            npm: 10
+            npm: ^10
+          - node: latest
+            npm: latest
 
     steps:
       - name: Checkout
@@ -37,7 +37,7 @@ jobs:
           node-version: ${{ matrix.node }}
 
       - name: Update npm
-        run: npm install -g npm@^${{ matrix.npm }}
+        run: npm install -g npm@${{ matrix.npm }}
 
       - name: npm install
         run: npm install
diff --git a/src/browser/telemetry.js b/src/browser/telemetry.js
index ea1532c5b..ea115b58e 100644
--- a/src/browser/telemetry.js
+++ b/src/browser/telemetry.js
@@ -1,5 +1,6 @@
 var _ = require('../utility');
 var headers = require('../utility/headers');
+var replace = require('../utility/replace');
 var scrub = require('../scrub');
 var urlparser = require('./url');
 var domUtil = require('./domUtility');
@@ -21,14 +22,6 @@ var defaults = {
   errorOnContentSecurityPolicy: false,
 };
 
-function replace(obj, name, replacement, replacements, type) {
-  var orig = obj[name];
-  obj[name] = replacement(orig);
-  if (replacements) {
-    replacements[type].push([obj, name, orig]);
-  }
-}
-
 function restore(replacements, type) {
   var b;
   while (replacements[type].length) {
diff --git a/src/server/telemetry.js b/src/server/telemetry.js
index f5a19cda8..0e614c344 100644
--- a/src/server/telemetry.js
+++ b/src/server/telemetry.js
@@ -1,6 +1,7 @@
 var http = require('http');
 var https = require('https');
 var _ = require('../utility');
+var replace = require('../utility/replace');
 var urlHelpers = require('./telemetry/urlHelpers');
 
 var defaults = {
@@ -185,20 +186,6 @@ Instrumenter.prototype.instrumentConsole = function () {
   );
 };
 
-// TODO: These helpers are duplicated in src/browser/telemetry.js,
-// and may be candidates for extraction into a shared module.
-// It is recommended that before doing so, the author should allow
-// for more telemetry types to be implemented for the Node target
-// to ensure that the implementations of these helpers don't diverge.
-// If they do diverge, there's little point in the shared module.
-function replace(obj, name, replacement, replacements, type) {
-  var orig = obj[name];
-  obj[name] = replacement(orig);
-  if (replacements) {
-    replacements[type].push([obj, name, orig]);
-  }
-}
-
 function restore(replacements, type) {
   var b;
   while (replacements[type].length) {
diff --git a/src/utility/replace.js b/src/utility/replace.js
new file mode 100644
index 000000000..892bcc25b
--- /dev/null
+++ b/src/utility/replace.js
@@ -0,0 +1,9 @@
+function replace(obj, name, replacement, replacements, type) {
+    var orig = obj[name];
+    obj[name] = replacement(orig);
+    if (replacements) {
+      replacements[type].push([obj, name, orig]);
+    }
+  }
+
+module.exports = replace;
diff --git a/test/server.locals.test.js b/test/server.locals.test.js
index 2900db609..509d5c1b4 100644
--- a/test/server.locals.test.js
+++ b/test/server.locals.test.js
@@ -130,22 +130,21 @@ function verifyThrownError(r) {
   assert.isTrue(addItemStub.called);
   var data = addItemStub.getCall(0).args[3].data;
   assert.equal(data.body.trace_chain[0].exception.message, 'node error');
-  if (nodeMajorVersion >= 10) {
-    // Node 10+; locals enabled
-    var length = data.body.trace_chain[0].frames.length;
-    assert.equal(
-      data.body.trace_chain[0].frames[length - 1].locals.error,
-      '<Error object>',
-    );
-    assert.equal(
-      data.body.trace_chain[0].frames[length - 2].locals.timer,
-      '<Timeout object>',
-    );
+  var length = data.body.trace_chain[0].frames.length;
+  assert.ok(length > 1);
+
+  if (nodeMajorVersion >= 18) {
+    // Node >=18; locals only in top frame
+    assert.equal(data.body.trace_chain[0].frames[length-1].locals.error, '<Error object>');
+    assert.equal(data.body.trace_chain[0].frames[length-2].locals, undefined);
+  } else if (nodeMajorVersion >= 10) {
+    // Node >=10; locals enabled
+    assert.equal(data.body.trace_chain[0].frames[length-1].locals.error, '<Error object>');
+    assert.equal(data.body.trace_chain[0].frames[length-2].locals.timer, '<Timeout object>');
   } else {
-    // Node 8; locals disabled
-    var length = data.body.trace_chain[0].frames.length;
-    assert.equal(data.body.trace_chain[0].frames[length - 1].locals, undefined);
-    assert.equal(data.body.trace_chain[0].frames[length - 2].locals, undefined);
+    // Node <=8; locals disabled
+    assert.equal(data.body.trace_chain[0].frames[length-1].locals, undefined);
+    assert.equal(data.body.trace_chain[0].frames[length-2].locals, undefined);
   }
   addItemStub.restore();
 }
@@ -156,21 +155,20 @@ function verifyCaughtError(r) {
   assert.isTrue(addItemStub.called);
   var data = addItemStub.getCall(0).args[3].data;
   assert.equal(data.body.trace_chain[0].exception.message, 'caught error');
-  if (nodeMajorVersion >= 10) {
-    // Node 10+; locals enabled
-    var length = data.body.trace_chain[0].frames.length;
-    assert.equal(
-      data.body.trace_chain[0].frames[length - 1].locals.error,
-      '<Error object>',
-    );
-    assert.equal(
-      data.body.trace_chain[0].frames[length - 2].locals.timer,
-      '<Timeout object>',
-    );
+  var length = data.body.trace_chain[0].frames.length;
+  assert.ok(length > 1);
+
+  if (nodeMajorVersion >= 18) {
+    // Node >=18; locals only in top frame
+    assert.equal(data.body.trace_chain[0].frames[length-1].locals.error, '<Error object>');
+    assert.equal(data.body.trace_chain[0].frames[length-2].locals, undefined);
+  } else if (nodeMajorVersion >= 10) {
+    // Node 10..<18; locals enabled
+    assert.equal(data.body.trace_chain[0].frames[length-1].locals.error, '<Error object>');
+    assert.equal(data.body.trace_chain[0].frames[length-2].locals.timer, '<Timeout object>');
   } else {
-    var length = data.body.trace_chain[0].frames.length;
-    assert.equal(data.body.trace_chain[0].frames[length - 1].locals, undefined);
-    assert.equal(data.body.trace_chain[0].frames[length - 2].locals, undefined);
+    assert.equal(data.body.trace_chain[0].frames[length-1].locals, undefined);
+    assert.equal(data.body.trace_chain[0].frames[length-2].locals, undefined);
   }
   addItemStub.restore();
 }
@@ -182,48 +180,40 @@ function verifyNestedError(r) {
   var data = addItemStub.getCall(0).args[3].data;
   assert.equal(data.body.trace_chain[0].exception.message, 'test error');
   assert.equal(data.body.trace_chain[1].exception.message, 'nested test error');
-  if (nodeMajorVersion >= 10) {
-    // Node 10+; locals enabled
-    var length = data.body.trace_chain[0].frames.length;
-    assert.equal(
-      data.body.trace_chain[0].frames[length - 1].locals.err,
-      '<Error object>',
-    );
-    assert.equal(
-      data.body.trace_chain[0].frames[length - 2].locals.timer,
-      '<Timeout object>',
-    );
+  var length = data.body.trace_chain[0].frames.length;
+  assert.ok(length > 1);
+
+  if (nodeMajorVersion >= 18) {
+    // Node >=18; locals only in top frame
+    assert.equal(data.body.trace_chain[0].frames[length-1].locals.message, 'test error');
+    assert.equal(data.body.trace_chain[0].frames[length-1].locals.password, '********');
+    assert.equal(data.body.trace_chain[0].frames[length-1].locals.err, '<Error object>');
+    assert.equal(data.body.trace_chain[0].frames[length-1].locals.newMessage, 'nested test error');
+    assert.equal(data.body.trace_chain[0].frames[length-2].locals, undefined);
+
+    length = data.body.trace_chain[1].frames.length;
+    assert.ok(length > 1);
+    assert.equal(data.body.trace_chain[1].frames[length-1].locals.nestedMessage, 'nested test error');
+    assert.equal(data.body.trace_chain[1].frames[length-1].locals._password, '123456');
+    assert.equal(data.body.trace_chain[1].frames[length-1].locals.nestedError, '<Error object>');
+    assert.equal(data.body.trace_chain[1].frames[length-2].locals, undefined);
+  } else if (nodeMajorVersion >= 10) {
+    // Node >=10; locals enabled
+    assert.equal(data.body.trace_chain[0].frames[length-1].locals.err, '<Error object>');
+    assert.equal(data.body.trace_chain[0].frames[length-2].locals.timer, '<Timeout object>');
 
     length = data.body.trace_chain[1].frames.length;
-    assert.equal(
-      data.body.trace_chain[1].frames[length - 1].locals.nestedMessage,
-      'nested test error',
-    );
-    assert.equal(
-      data.body.trace_chain[1].frames[length - 1].locals.nestedError,
-      '<Error object>',
-    );
-    assert.equal(
-      data.body.trace_chain[1].frames[length - 2].locals.message,
-      'test error',
-    );
-    assert.equal(
-      data.body.trace_chain[1].frames[length - 2].locals.password,
-      '********',
-    );
-    assert.equal(
-      data.body.trace_chain[1].frames[length - 2].locals.err,
-      '<Error object>',
-    );
-    assert.equal(
-      data.body.trace_chain[1].frames[length - 2].locals.newMessage,
-      'nested test error',
-    );
+    assert.ok(length > 1);
+    assert.equal(data.body.trace_chain[1].frames[length-1].locals.nestedMessage, 'nested test error');
+    assert.equal(data.body.trace_chain[1].frames[length-1].locals.nestedError, '<Error object>');
+    assert.equal(data.body.trace_chain[1].frames[length-2].locals.message, 'test error');
+    assert.equal(data.body.trace_chain[1].frames[length-2].locals.password, '********');
+    assert.equal(data.body.trace_chain[1].frames[length-2].locals.err, '<Error object>');
+    assert.equal(data.body.trace_chain[1].frames[length-2].locals.newMessage, 'nested test error');
   } else {
-    // Node 8; locals disabled
-    var length = data.body.trace_chain[0].frames.length;
-    assert.equal(data.body.trace_chain[0].frames[length - 1].locals, undefined);
-    assert.equal(data.body.trace_chain[0].frames[length - 2].locals, undefined);
+    // Node <=8; locals disabled
+    assert.equal(data.body.trace_chain[0].frames[length-1].locals, undefined);
+    assert.equal(data.body.trace_chain[0].frames[length-2].locals, undefined);
   }
   addItemStub.restore();
 }
@@ -234,30 +224,25 @@ function verifyRejectedPromise(r) {
   assert.isTrue(addItemStub.called);
   var data = addItemStub.getCall(0).args[3].data;
   assert.equal(data.body.trace_chain[0].exception.message, 'promise reject');
-  if (nodeMajorVersion >= 10) {
-    // Node 10+; locals enabled
-    var length = data.body.trace_chain[0].frames.length;
-    assert.equal(
-      data.body.trace_chain[0].frames[length - 1].locals.error,
-      '<Error object>',
-    );
-    assert.equal(
-      data.body.trace_chain[0].frames[length - 1].locals.rollbar,
-      '<Rollbar object>',
-    );
-    assert.equal(
-      data.body.trace_chain[0].frames[length - 2].locals.notifier,
-      '<Notifier object>',
-    );
-    assert.equal(
-      data.body.trace_chain[0].frames[length - 2].locals.r,
-      '<Rollbar object>',
-    );
+  var length = data.body.trace_chain[0].frames.length;
+  assert.ok(length > 1);
+
+  if (nodeMajorVersion >= 18) {
+    // Node >=18; locals only in top frame
+    assert.equal(data.body.trace_chain[0].frames[length-1].locals.error, '<Error object>');
+    assert.equal(data.body.trace_chain[0].frames[length-1].locals.callback, '<Function object>');
+    assert.equal(data.body.trace_chain[0].frames[length-1].locals.rollbar, '<Rollbar object>');
+    assert.equal(data.body.trace_chain[0].frames[length-2].locals, undefined);
+  } else if (nodeMajorVersion >= 10) {
+    // Node >=10; locals enabled
+    assert.equal(data.body.trace_chain[0].frames[length-1].locals.error, '<Error object>');
+    assert.equal(data.body.trace_chain[0].frames[length-1].locals.rollbar, '<Rollbar object>');
+    assert.equal(data.body.trace_chain[0].frames[length-2].locals.notifier, '<Notifier object>');
+    assert.equal(data.body.trace_chain[0].frames[length-2].locals.r, '<Rollbar object>');
   } else {
-    // Node 8; locals disabled
-    var length = data.body.trace_chain[0].frames.length;
-    assert.equal(data.body.trace_chain[0].frames[length - 1].locals, undefined);
-    assert.equal(data.body.trace_chain[0].frames[length - 2].locals, undefined);
+    // Node <=8; locals disabled
+    assert.equal(data.body.trace_chain[0].frames[length-1].locals, undefined);
+    assert.equal(data.body.trace_chain[0].frames[length-2].locals, undefined);
   }
   addItemStub.restore();
 }
@@ -293,12 +278,14 @@ vows
         topic: function (_err, r) {
           r.configure({ locals: { enabled: false } });
           var notifier = r.client.notifier;
+          assert.ok(notifier);
           r.addItemStub = sinon.stub(notifier.queue, 'addItem');
 
           nodeThrowNested(r, this.callback);
         },
         'should not include locals': function (_err, r) {
           var addItemStub = r.addItemStub;
+          assert.ok(addItemStub);
 
           assert.isTrue(addItemStub.called);
           var data = addItemStub.getCall(0).args[3].data;
@@ -311,14 +298,9 @@ vows
             'nested test error',
           );
           var length = data.body.trace_chain[0].frames.length;
-          assert.equal(
-            data.body.trace_chain[0].frames[length - 1].locals,
-            undefined,
-          );
-          assert.equal(
-            data.body.trace_chain[0].frames[length - 2].locals,
-            undefined,
-          );
+          assert.ok(length > 1);
+          assert.equal(data.body.trace_chain[0].frames[length-1].locals, undefined);
+          assert.equal(data.body.trace_chain[0].frames[length-2].locals, undefined);
           addItemStub.restore();
         },
         'then enabled': {
@@ -362,14 +344,9 @@ vows
             'caught error',
           );
           var length = data.body.trace_chain[0].frames.length;
-          assert.equal(
-            data.body.trace_chain[0].frames[length - 1].locals,
-            undefined,
-          );
-          assert.equal(
-            data.body.trace_chain[0].frames[length - 2].locals,
-            undefined,
-          );
+          assert.ok(length > 1);
+          assert.equal(data.body.trace_chain[0].frames[length-1].locals, undefined);
+          assert.equal(data.body.trace_chain[0].frames[length-2].locals, undefined);
 
           addItemStub.restore();
         },
@@ -542,31 +519,23 @@ vows
 
           assert.isTrue(addItemStub.called);
           var data = addItemStub.getCall(0).args[3].data;
-          assert.equal(
-            data.body.trace_chain[0].exception.message,
-            'deep stack error, limit=3',
-          );
-          if (nodeMajorVersion < 10) {
-            // Node 8; locals disabled
-            var length = data.body.trace_chain[0].frames.length;
-            assert.equal(
-              data.body.trace_chain[0].frames[length - 1].locals,
-              undefined,
-            );
+          assert.equal(data.body.trace_chain[0].exception.message, 'deep stack error, limit=3');
+          var length = data.body.trace_chain[0].frames.length;
+          assert.ok(length > 1);
+
+          if (nodeMajorVersion >= 18) {
+            // Node >=18; locals only in top frame
+            assert.deepEqual(data.body.trace_chain[0].frames[length-1].locals, { curr: 3, limit: 3 });
+            assert.equal(data.body.trace_chain[0].frames[length-2].locals, undefined);
+            assert.equal(data.body.trace_chain[0].frames[length-3].locals, undefined);
+          } else if (nodeMajorVersion >= 10) {
+            // Node >=10; locals enabled
+            assert.deepEqual(data.body.trace_chain[0].frames[length-1].locals, { curr: 3, limit: 3 });
+            assert.deepEqual(data.body.trace_chain[0].frames[length-2].locals, { curr: 2, limit: 3 });
+            assert.deepEqual(data.body.trace_chain[0].frames[length-3].locals, { curr: 1, limit: 3 });
           } else {
-            var length = data.body.trace_chain[0].frames.length;
-            assert.deepEqual(
-              data.body.trace_chain[0].frames[length - 1].locals,
-              { curr: 3, limit: 3 },
-            );
-            assert.deepEqual(
-              data.body.trace_chain[0].frames[length - 2].locals,
-              { curr: 2, limit: 3 },
-            );
-            assert.deepEqual(
-              data.body.trace_chain[0].frames[length - 3].locals,
-              { curr: 1, limit: 3 },
-            );
+            // Node <=8; locals disabled
+            assert.equal(data.body.trace_chain[0].frames[length-1].locals, undefined);
           }
           addItemStub.reset();
           Locals.session = undefined;