diff --git a/sample/package.json b/sample/package.json
index a2d2c66..52a151b 100644
--- a/sample/package.json
+++ b/sample/package.json
@@ -8,7 +8,7 @@
     "highlight.js": "^9.13.1",
     "parcel": "1.12.4",
     "parcel-bundler": "1.12.4",
-    "postcss": "8.4.31",
+    "postcss": "8.5.10",
     "postcss-flexbugs-fixes": "^4.1.0",
     "postcss-modules": "^1.4.1",
     "rimraf": "3.0.0",