diff --git a/package.json b/package.json
old mode 100755
new mode 100644
index 4623e97..b655c76
--- a/package.json
+++ b/package.json
@@ -10,7 +10,7 @@
     "grunt-csscomb":"^3.0.0",
     "grunt-contrib-cssmin": "^0.10.0",
     "grunt-contrib-copy": "^0.8.0",
-    "grunt-contrib-uglify": "^0.6.0",
+    "grunt-contrib-uglify": "^4.0.1",
     "grunt-autoprefixer": "^1.0.1",
     "less-plugin-glob": "^1.1.0",
     "grunt-contrib-connect": "^0.9.0"