diff --git a/package.json b/package.json
index 1b77963d..8dbf5f29 100644
--- a/package.json
+++ b/package.json
@@ -51,7 +51,7 @@
     "@google-cloud/common": "^5.0.0",
     "@google-cloud/paginator": "^5.0.0",
     "@google-cloud/precise-date": "^3.0.1",
-    "@google-cloud/promisify": "^3.0.0",
+    "@google-cloud/promisify": "^4.0.0",
     "arrify": "^2.0.1",
     "big.js": "^6.0.0",
     "duplexify": "^4.0.0",