diff --git a/package.json b/package.json
index cbc58f3..14a7d42 100644
--- a/package.json
+++ b/package.json
@@ -24,7 +24,7 @@
   "author": "fis@baidu.com",
   "license": "BSD",
   "dependencies": {
-    "async": "1.4.2",
+    "async": "2.1.2",
     "bluebird": "3.4.6",
     "body-parser": "1.9.3",
     "colors": "1.0.3",