diff --git a/packages/google-cloud-texttospeech/package.json b/packages/google-cloud-texttospeech/package.json
index 271657e0dfc..6df1951d3d2 100644
--- a/packages/google-cloud-texttospeech/package.json
+++ b/packages/google-cloud-texttospeech/package.json
@@ -59,7 +59,7 @@
     "mocha": "^8.0.0",
     "null-loader": "^4.0.0",
     "pack-n-play": "^1.0.0-2",
-    "sinon": "^11.0.0",
+    "sinon": "^12.0.0",
     "ts-loader": "^9.0.0",
     "typescript": "^3.8.3",
     "webpack": "^5.0.0",