diff --git a/packages/google-cloud-monitoring/package.json b/packages/google-cloud-monitoring/package.json
index 8f7fc79ae1c..4cbdf00c895 100644
--- a/packages/google-cloud-monitoring/package.json
+++ b/packages/google-cloud-monitoring/package.json
@@ -46,7 +46,7 @@
     "google-gax": "^2.30.2"
   },
   "devDependencies": {
-    "@types/mocha": "^8.0.0",
+    "@types/mocha": "^9.0.0",
     "@types/node": "^16.0.0",
     "@types/sinon": "^10.0.0",
     "c8": "^7.1.0",