diff --git a/package.json b/package.json
index 65221f149..73001be24 100644
--- a/package.json
+++ b/package.json
@@ -76,7 +76,7 @@
     "rollup-plugin-buble": "^0.19.6",
     "rollup-plugin-node-resolve": "4.2.3",
     "rollup-plugin-sizes": "^0.5.1",
-    "uglify-js": "3.5.8"
+    "uglify-js": "3.9.2"
   },
   "scripts": {
     "start": "ws",