diff --git a/package.json b/package.json
index 830b34a..e68b9ad 100644
--- a/package.json
+++ b/package.json
@@ -21,7 +21,7 @@
     "grunt-contrib-connect": "^1.0.2",
     "grunt-contrib-copy": "^1.0.0",
     "grunt-contrib-jshint": "^1.1.0",
-    "grunt-contrib-uglify": "^3.3.0",
+    "grunt-contrib-uglify": "^4.0.0",
     "grunt-contrib-watch": "^1.0.0",
     "grunt-filerev": "^2.3.1",
     "grunt-karma": "^2.0.0",