diff --git a/package.json b/package.json
index ac40e29b1..52de45897 100644
--- a/package.json
+++ b/package.json
@@ -13,7 +13,7 @@
     "test": "vows"
   },
   "dependencies": {
-    "async": "~0.4",
+    "async": "~0.6",
     "clean-css": "~2.1",
     "execSync": "~0.0",
     "fs-extra": "~0.8",