diff --git a/package.json b/package.json
index e93165f..46ea6db 100644
--- a/package.json
+++ b/package.json
@@ -57,7 +57,7 @@
     "nyc": "^12.0.2",
     "rimraf": "^2.6.2",
     "rollup": "^0.64.1",
-    "rollup-plugin-uglify": "^4.0.0",
+    "rollup-plugin-uglify": "^5.0.0",
     "ts-node": "^7.0.1",
     "tslint": "^5.11.0",
     "typedoc": "^0.11.1",