diff --git a/package.json b/package.json
index 0cf4d84..700f0bd 100644
--- a/package.json
+++ b/package.json
@@ -37,7 +37,7 @@
     "useragent": "^2.0.9"
   },
   "devDependencies": {
-    "async": "^2.1.1",
+    "async": "^3.2.4",
     "chai": "^4.0.2",
     "del": "^3.0.0",
     "jshint": "^2.9.3"