diff --git a/package.json b/package.json
index 3e9bcf2..5b27dd6 100644
--- a/package.json
+++ b/package.json
@@ -22,7 +22,7 @@
     "grunt-contrib-coffee": "*",
     "grunt-contrib-concat": "^1.0.1",
     "grunt-contrib-jasmine": "*",
-    "grunt-contrib-uglify": "^3.0.1",
+    "grunt-contrib-uglify": "^4.0.0",
     "jasmine-ajax": "3.*"
   },
   "scripts": {