diff --git a/package.json b/package.json
index fb94b7c..5476c26 100644
--- a/package.json
+++ b/package.json
@@ -33,7 +33,7 @@
     "mocha": "^6.1.4",
     "npm-watch": "~0.6.0",
     "nyc": "^14.0.0",
-    "terser": "^3.17.0",
+    "terser": "^4.6.4",
     "universal-url": "^2.0.0"
   },
   "engines": {