diff --git a/app/polymer/package.json b/app/polymer/package.json
index ba5a756e04e3..638587883d27 100644
--- a/app/polymer/package.json
+++ b/app/polymer/package.json
@@ -25,7 +25,7 @@
     "@storybook/addons": "^3.4.0-alpha.4",
     "@storybook/channel-postmessage": "^3.4.0-alpha.4",
     "@storybook/client-logger": "^3.4.0-alpha.4",
-    "@storybook/core": "^3.4.0-alpha.4",
+    "@storybook/core": "^4.0.0",
     "@storybook/node-logger": "^3.4.0-alpha.4",
     "@storybook/ui": "^3.4.0-alpha.4",
     "@webcomponents/webcomponentsjs": "^1.0.17",
@@ -50,7 +50,7 @@
     "configstore": "^3.1.1",
     "copy-webpack-plugin": "^4.2.0",
     "core-js": "^2.5.1",
-    "css-loader": "^0.28.7",
+    "css-loader": "^1.0.0",
     "express": "^4.16.2",
     "file-loader": "^0.11.2",
     "find-cache-dir": "^1.0.0",