diff --git a/package.json b/package.json
index 9596367..a9defd3 100644
--- a/package.json
+++ b/package.json
@@ -24,7 +24,7 @@
   "devDependencies": {
     "coveralls": "^3.0.2",
     "istanbul": "^0.4.5",
-    "uglify-js": "^3.4.9"
+    "uglify-js": "^3.6.3"
   },
   "repository": {
     "type": "git",