diff --git a/package.json b/package.json
index 7a5b22e..0b55a75 100644
--- a/package.json
+++ b/package.json
@@ -27,7 +27,7 @@
     "mocha": "^6.1.4",
     "npm-watch": "~0.6.0",
     "nyc": "^14.0.0",
-    "terser": "^3.17.0",
+    "terser": "^4.0.1",
     "universal-url": "^2.0.0"
   },
   "engines": {