diff --git a/package.json b/package.json
index c0d58413..a426ec37 100644
--- a/package.json
+++ b/package.json
@@ -31,7 +31,7 @@
     "should": "^5.0.0"
   },
   "dependencies": {
-    "async": "^1.0.0",
+    "async": "~1.0.0",
     "debug": "^2.1.1",
     "depd": "^1.0.0",
     "inflection": "^1.6.0",