diff --git a/app/polymer/package.json b/app/polymer/package.json
index ba5a756e04e3..804fb6cd9624 100644
--- a/app/polymer/package.json
+++ b/app/polymer/package.json
@@ -48,7 +48,7 @@
     "commander": "^2.11.0",
     "common-tags": "^1.4.0",
     "configstore": "^3.1.1",
-    "copy-webpack-plugin": "^4.2.0",
+    "copy-webpack-plugin": "^5.0.0",
     "core-js": "^2.5.1",
     "css-loader": "^0.28.7",
     "express": "^4.16.2",