diff --git a/examples/preact/package.json b/examples/preact/package.json
index c88aea592bb1f3..0f065c64c28072 100644
--- a/examples/preact/package.json
+++ b/examples/preact/package.json
@@ -37,10 +37,10 @@
     "mini-css-extract-plugin": "0.5.0",
     "optimize-css-assets-webpack-plugin": "5.0.1",
     "pnp-webpack-plugin": "1.2.1",
-    "postcss-flexbugs-fixes": "4.1.0",
-    "postcss-loader": "3.0.0",
+    "postcss-flexbugs-fixes": "5.0.0",
+    "postcss-loader": "4.0.0",
     "postcss-preset-env": "6.5.0",
-    "postcss-safe-parser": "4.0.1",
+    "postcss-safe-parser": "5.0.0",
     "preact": "^10.0.0-beta.0",
     "react": "^16.8.6",
     "react-app-polyfill": "^0.2.2",