diff --git a/package.json b/package.json
index a10619e12..77da00de0 100644
--- a/package.json
+++ b/package.json
@@ -51,7 +51,7 @@
     "grunt-contrib-cssmin": "~0.11.0",
     "grunt-contrib-jshint": "~0.10.0",
     "grunt-contrib-less": "~1.1.0",
-    "grunt-contrib-uglify": "~0.7.0",
+    "grunt-contrib-uglify": "~4.0.1",
     "grunt-contrib-watch": "~0.6.1",
     "grunt-sed": "~0.1.1",
     "grunt-umd": "~2.3.3",