diff --git a/package.json b/package.json
index b668359b2..b708ccbe7 100644
--- a/package.json
+++ b/package.json
@@ -54,7 +54,7 @@
     "grunt-contrib-compress": "^1.3.0",
     "grunt-contrib-concat": "^1.0.1",
     "grunt-contrib-copy": "^1.0.0",
-    "grunt-contrib-uglify": "^1.0.1",
+    "grunt-contrib-uglify": "^3.4.0",
     "grunt-contrib-watch": "^1.0.0",
     "grunt-exec": "^1.0.0",
     "jszip": "^3.1.3",