diff --git a/package.json b/package.json
index 53b4df5..fd469f6 100644
--- a/package.json
+++ b/package.json
@@ -30,7 +30,7 @@
     "mocha": "2.2.5"
   },
   "dependencies": {
-    "async": "1.2.1",
+    "async": "2.4.0",
     "insist-types": "1.0.9",
     "rethinkdb": "2.3.3"
   },