diff --git a/package.json b/package.json
index c7bbe71..2a5b9d1 100644
--- a/package.json
+++ b/package.json
@@ -18,7 +18,7 @@
   },
   "homepage": "https://github.com/ibm-cds-labs/simple-notification-service#readme",
   "dependencies": {
-    "async": "^2.0.1",
+    "async": "^3.2.2",
     "body-parser": "^1.15.2",
     "cf-deployment-tracker-client": "^0.1.2",
     "cfenv": "^1.0.3",