diff --git a/package.json b/package.json
index 55b3c87..3ee7a78 100644
--- a/package.json
+++ b/package.json
@@ -28,7 +28,7 @@
   },
   "homepage": "https://github.com/dactylographsy/node-dactylographsy",
   "dependencies": {
-    "async": "2.3.0",
+    "async": "2.4.0",
     "lodash": "4.17.4",
     "sprint": "0.3.1",
     "string-hash": "1.1.3"