diff --git a/package.json b/package.json
index 04912340..6c14d492 100644
--- a/package.json
+++ b/package.json
@@ -42,7 +42,7 @@
     "predocs-test": "npm run docs"
   },
   "dependencies": {
-    "@google-cloud/promisify": "^0.3.0",
+    "@google-cloud/promisify": "^0.4.0",
     "google-gax": "^0.25.0",
     "is": "^3.2.1",
     "lodash.merge": "^4.6.1",