diff --git a/package.json b/package.json
index 8b29a97..8af4aa1 100644
--- a/package.json
+++ b/package.json
@@ -10,7 +10,7 @@
     "grunt-contrib-clean": "~2.0.0",
     "grunt-contrib-concat": "~1.0.0",
     "grunt-contrib-jshint": "~2.0.0",
-    "grunt-contrib-uglify": "^3.0.1",
+    "grunt-contrib-uglify": "^5.2.2",
     "grunt-contrib-watch": "~1.1.0",
     "grunt-karma": "^2.0.0",
     "jasmine-core": "^2.4.1",