diff --git a/package.json b/package.json
index 399cbad..98afbe6 100644
--- a/package.json
+++ b/package.json
@@ -23,7 +23,7 @@
     "grunt-contrib-nodeunit": "~0.1.2",
     "grunt-contrib-uglify": "*",
     "grunt-cli": "*",
-    "uglify-js": "~2.2.1",
+    "uglify-js": "~3.6.6",
     "grunt-contrib-copy": "~0.4.1",
     "grunt-contrib-clean": "~0.4.0",
     "grunt-contrib-less": "~0.5.0",