diff --git a/packages/google-cloud-oslogin/package.json b/packages/google-cloud-oslogin/package.json
index 6319599e27a..d889cef32de 100644
--- a/packages/google-cloud-oslogin/package.json
+++ b/packages/google-cloud-oslogin/package.json
@@ -59,7 +59,7 @@
     "ink-docstrap": "^1.3.2",
     "intelli-espower-loader": "^1.0.1",
     "jsdoc": "^3.5.5",
-    "mocha": "^3.5.3",
+    "mocha": "^4.1.0",
     "nyc": "^11.4.1",
     "power-assert": "^1.4.4",
     "prettier": "^1.9.2",