diff --git a/package.json b/package.json
index be1a022..9724dce 100644
--- a/package.json
+++ b/package.json
@@ -8,7 +8,7 @@
   ],
   "author"      : "dreamerslab <ben@dreamerslab.com>",
   "dependencies": {
-    "clean-css"  : "2.0.2",
+    "clean-css"  : "4.2.1",
     "uglify-js" : "2.4.7"
   },
   "repository"  : {