diff --git a/package.json b/package.json
index 87970c51..c10a7a18 100644
--- a/package.json
+++ b/package.json
@@ -18,7 +18,7 @@
     "markdown-it-sup": "^1.0.0",
     "mime": "^2.3.1",
     "mold-template": "^2.0.1",
-    "uglify-js": "^2.0.0"
+    "uglify-js": "^3.14.3"
   },
   "devDependencies": {
     "jsdom": "^11.2.0",