diff --git a/packages/docusaurus/package.json b/packages/docusaurus/package.json
index 6394f4da85c9..2195a55f76e8 100644
--- a/packages/docusaurus/package.json
+++ b/packages/docusaurus/package.json
@@ -92,6 +92,7 @@
     "null-loader": "^4.0.0",
     "optimize-css-assets-webpack-plugin": "^5.0.4",
     "pnp-webpack-plugin": "^1.6.4",
+    "postcss": "^8.2.6",
     "postcss-loader": "^4.1.0",
     "postcss-preset-env": "^6.7.0",
     "prompts": "^2.4.0",
diff --git a/yarn.lock b/yarn.lock
index 76bcddeb65b3..fb074370c9d2 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -16289,7 +16289,7 @@ postcss@^7.0.0, postcss@^7.0.1, postcss@^7.0.14, postcss@^7.0.17, postcss@^7.0.1
     source-map "^0.6.1"
     supports-color "^6.1.0"
 
-postcss@^8.2.4:
+postcss@^8.2.4, postcss@^8.2.6:
   version "8.2.6"
   resolved "https://registry.yarnpkg.com/postcss/-/postcss-8.2.6.tgz#5d69a974543b45f87e464bc4c3e392a97d6be9fe"
   integrity sha512-xpB8qYxgPuly166AGlpRjUdEYtmOWx2iCwGmrv4vqZL9YPVviDVPZPRXxnXr6xPZOdxQ9lp3ZBFCRgWJ7LE3Sg==