diff --git a/lib/core/package.json b/lib/core/package.json
index 48571bbd70e0..13b262e7c403 100644
--- a/lib/core/package.json
+++ b/lib/core/package.json
@@ -22,11 +22,11 @@
     "@storybook/client-logger": "3.4.0-rc.2",
     "@storybook/node-logger": "3.4.0-rc.2",
     "@storybook/ui": "3.4.0-rc.2",
-    "autoprefixer": "^7.2.6",
+    "autoprefixer": "^9.0.0",
     "babel-runtime": "^6.26.0",
     "chalk": "^2.3.2",
     "commander": "^2.15.0",
-    "css-loader": "^0.28.10",
+    "css-loader": "^1.0.0",
     "dotenv": "^5.0.1",
     "events": "^2.0.0",
     "express": "^4.16.3",