diff --git a/package.json b/package.json
index 8423fb7b..08868222 100644
--- a/package.json
+++ b/package.json
@@ -43,7 +43,7 @@
   "dependencies": {
     "@google-cloud/promisify": "^4.0.0",
     "arrify": "^2.0.1",
-    "async-mutex": "^0.4.0",
+    "async-mutex": "^0.5.0",
     "concat-stream": "^2.0.0",
     "extend": "^3.0.2",
     "google-gax": "^4.0.5",