diff --git a/dev-packages/jsdoc-region-tag/package.json b/dev-packages/jsdoc-region-tag/package.json
index b633019f3..724fc3c25 100644
--- a/dev-packages/jsdoc-region-tag/package.json
+++ b/dev-packages/jsdoc-region-tag/package.json
@@ -40,7 +40,7 @@
   "devDependencies": {
     "c8": "^9.0.0",
     "gts": "^5.0.0",
-    "mocha": "^9.2.2",
+    "mocha": "^10.0.0",
     "typescript": "^5.1.6"
   },
   "engines": {
diff --git a/packages/gax/samples/package.json b/packages/gax/samples/package.json
index 44bf11b8b..a2e8eeea9 100644
--- a/packages/gax/samples/package.json
+++ b/packages/gax/samples/package.json
@@ -18,6 +18,6 @@
   },
   "devDependencies": {
     "c8": "^9.0.0",
-    "mocha": "^9.0.0"
+    "mocha": "^10.0.0"
   }
 }
\ No newline at end of file
diff --git a/packages/gcp-metadata/samples/package.json b/packages/gcp-metadata/samples/package.json
index 2c29849e0..3e779015c 100644
--- a/packages/gcp-metadata/samples/package.json
+++ b/packages/gcp-metadata/samples/package.json
@@ -18,6 +18,6 @@
   },
   "devDependencies": {
     "chai": "^4.2.0",
-    "mocha": "^8.0.0"
+    "mocha": "^10.0.0"
   }
 }
\ No newline at end of file
diff --git a/packages/google-auth-library-nodejs/samples/package.json b/packages/google-auth-library-nodejs/samples/package.json
index 0d649bc68..58017cf31 100644
--- a/packages/google-auth-library-nodejs/samples/package.json
+++ b/packages/google-auth-library-nodejs/samples/package.json
@@ -27,6 +27,6 @@
   },
   "devDependencies": {
     "chai": "^4.2.0",
-    "mocha": "^8.0.0"
+    "mocha": "^10.0.0"
   }
 }
diff --git a/packages/logging-utils/samples/package.json b/packages/logging-utils/samples/package.json
index 212ada60b..e2e961156 100644
--- a/packages/logging-utils/samples/package.json
+++ b/packages/logging-utils/samples/package.json
@@ -31,6 +31,6 @@
   "devDependencies": {
     "@google-cloud/typeless-sample-bot": "^2.1.0",
     "gts": "^5.0.0",
-    "mocha": "^9.0.0"
+    "mocha": "^10.0.0"
   }
 }
diff --git a/packages/nodejs-proto-files/samples/package.json b/packages/nodejs-proto-files/samples/package.json
index f9b4085c3..c4530cffa 100644
--- a/packages/nodejs-proto-files/samples/package.json
+++ b/packages/nodejs-proto-files/samples/package.json
@@ -18,6 +18,6 @@
   },
   "devDependencies": {
     "chai": "^4.2.0",
-    "mocha": "^8.0.0"
+    "mocha": "^10.0.0"
   }
 }
\ No newline at end of file
diff --git a/packages/proto3-json-serializer-nodejs/samples/package.json b/packages/proto3-json-serializer-nodejs/samples/package.json
index 39fa1259b..d425c06b9 100644
--- a/packages/proto3-json-serializer-nodejs/samples/package.json
+++ b/packages/proto3-json-serializer-nodejs/samples/package.json
@@ -20,6 +20,6 @@
   },
   "devDependencies": {
     "c8": "^9.0.0",
-    "mocha": "^9.0.0"
+    "mocha": "^10.0.0"
   }
 }
\ No newline at end of file