diff --git a/package.json b/package.json
index 9d581e0..5434560 100644
--- a/package.json
+++ b/package.json
@@ -37,7 +37,7 @@
     "worker-farm": "~1.3.1"
   },
   "devDependencies": {
-    "async": "~2.3.0",
+    "async": "~2.4.0",
     "coveralls": "latest",
     "git-dirty": "latest",
     "min-delay": "~1.0.1",