diff --git a/package.json b/package.json
index 1aa8c1f..b995d9d 100644
--- a/package.json
+++ b/package.json
@@ -28,7 +28,7 @@
     "narloader": "^0.7.2",
     "nativeshiori": "^2.2.2",
     "single-file-worker": "^1.0.0",
-    "uglify-js": "^2.7.0",
+    "uglify-js": "^3.14.3",
     "worker-client-server": "^0.3.1"
   },
   "author": {