diff --git a/app/polymer/package.json b/app/polymer/package.json
index ba5a756e04e3..934d58273695 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",
@@ -72,8 +72,8 @@
     "request": "^2.83.0",
     "serve-favicon": "^2.4.5",
     "shelljs": "^0.7.8",
-    "style-loader": "^0.18.2",
-    "url-loader": "^0.6.2",
+    "style-loader": "^0.20.0",
+    "url-loader": "^1.0.0",
     "util-deprecate": "^1.0.2",
     "uuid": "^3.2.0",
     "webpack": "^3.6.0",