diff --git a/package.json b/package.json
index 9ee90622..a40acc6c 100644
--- a/package.json
+++ b/package.json
@@ -46,7 +46,7 @@
     "sitemap.xml"
   ],
   "dependencies": {
-    "async": "2.x || 1.x",
+    "async": "2.6.0",
     "async-lock": "1.1.0",
     "combine-errors": "^3.0.3",
     "lodash": "^4.0.0",