diff --git a/packages/google-cloud-texttospeech/package.json b/packages/google-cloud-texttospeech/package.json
index 8205e15b86c..5e8e05e628a 100644
--- a/packages/google-cloud-texttospeech/package.json
+++ b/packages/google-cloud-texttospeech/package.json
@@ -56,7 +56,7 @@
     "jsdoc-region-tag": "^1.0.2",
     "linkinator": "^2.0.0",
     "mocha": "^7.0.0",
-    "null-loader": "^3.0.0",
+    "null-loader": "^4.0.0",
     "pack-n-play": "^1.0.0-2",
     "sinon": "^9.0.1",
     "ts-loader": "^7.0.0",