diff --git a/package.json b/package.json
index 345cc37..ccd9419 100644
--- a/package.json
+++ b/package.json
@@ -26,7 +26,7 @@
   },
   "homepage": "https://github.com/cybertk/ramlev",
   "dependencies": {
-    "async": "^1.4.0",
+    "async": "^3.2.2",
     "chai": "~3.2.0",
     "coffee-script": "~1.9.3",
     "csonschema": "^0.5.1",