diff --git a/app/polymer/package.json b/app/polymer/package.json
index d6e2435e99c9..3cf3aa7c335c 100644
--- a/app/polymer/package.json
+++ b/app/polymer/package.json
@@ -41,7 +41,7 @@
     "babel-runtime": "^6.26.0",
     "case-sensitive-paths-webpack-plugin": "^2.1.2",
     "common-tags": "^1.4.0",
-    "copy-webpack-plugin": "^4.5.1",
+    "copy-webpack-plugin": "^9.0.1",
     "core-js": "^2.5.1",
     "dotenv-webpack": "^1.5.5",
     "find-cache-dir": "^1.0.0",