diff --git a/package.json b/package.json
index 64311be..901db6a 100644
--- a/package.json
+++ b/package.json
@@ -23,7 +23,7 @@
   },
   "dependencies": {
     "JSONStream": "1.0.7",
-    "async": "1.5.2",
+    "async": "2.4.0",
     "body-parser": "^1.14.2",
     "chai": "*",
     "event-stream": "3.3.2",