diff --git a/package.json b/package.json
index 5941df6..f453213 100644
--- a/package.json
+++ b/package.json
@@ -36,6 +36,6 @@
 		"mocha-jshint": ""
 	},
 	"dependencies": {
-		"async": ""
+		"async": "2.3.0"
 	}
 }