diff --git a/package.json b/package.json
index 3c64bc2..6eba9d6 100644
--- a/package.json
+++ b/package.json
@@ -46,7 +46,7 @@
     "time-grunt": "~1.4.0"
   },
   "dependencies": {
-    "async": "^2.0.1",
+    "async": "^2.4.0",
     "chai": "~3.5.0",
     "coffee-errors": "^0.8.6",
     "coffee-script": "~1.12.1",