diff --git a/package.json b/package.json
index 436d529..f3adfd3 100644
--- a/package.json
+++ b/package.json
@@ -28,7 +28,7 @@
   "devDependencies": {
     "grunt": "~0.4.4",
     "grunt-contrib-clean": "~0.5.0",
-    "grunt-contrib-concat": "~0.3.0",
+    "grunt-contrib-concat": "~0.4.0",
     "grunt-contrib-copy": "~0.5.0",
     "grunt-contrib-csslint": "~0.2.0",
     "grunt-contrib-cssmin": "~0.9.0",