diff --git a/package.json b/package.json
index bcf3217c0..730cb788c 100644
--- a/package.json
+++ b/package.json
@@ -38,6 +38,6 @@
   },
   "devDependencies": {
     "jison": "0.2.1",
-    "uglify-js": "2.2.5"
+    "uglify-js": "3.6.4"
   }
 }