diff --git a/package.json b/package.json
index 126ce34b6..77a44d849 100644
--- a/package.json
+++ b/package.json
@@ -138,7 +138,7 @@
     "ts-node": "2.1.0",
     "tslint": "4.5.1",
     "typescript": "2.2.1",
-    "uglify-js": "git+https://github.com/mishoo/UglifyJS2.git#harmony",
+    "uglify-js": "git+https://github.com/mishoo/UglifyJS2.git#e9920f7ca162ce062cc481b876be293d7324a714",
     "uuid": "3.0.1",
     "velocity-animate": "1.4.3",
     "vhost": "3.0.2",