diff --git a/packages/google-cloud-dialogflow/package.json b/packages/google-cloud-dialogflow/package.json
index 1bfdf0183d9..738486ca838 100644
--- a/packages/google-cloud-dialogflow/package.json
+++ b/packages/google-cloud-dialogflow/package.json
@@ -48,7 +48,7 @@
   "devDependencies": {
     "@types/mocha": "^5.2.5",
     "@types/node": "^12.0.0",
-    "@types/sinon": "^7.5.2",
+    "@types/sinon": "^9.0.0",
     "c8": "^7.0.0",
     "codecov": "^3.0.0",
     "eslint": "^6.0.0",