diff --git a/package.json b/package.json
index 13efcc14..5b7bf705 100644
--- a/package.json
+++ b/package.json
@@ -142,6 +142,7 @@
     "nock": "^15.0.0",
     "npm-run-all": "^4.1.5",
     "open": "^11.0.0",
+    "postcss": "8.5.15",
     "prettier": "^3.8.3",
     "sass": "^1.99.0",
     "sass-loader": "^16.0.7",
diff --git a/pnpm-lock.yaml b/pnpm-lock.yaml
index 62ed9be4..b3228326 100644
--- a/pnpm-lock.yaml
+++ b/pnpm-lock.yaml
@@ -192,6 +192,9 @@ importers:
       open:
         specifier: ^11.0.0
         version: 11.0.0
+      postcss:
+        specifier: 8.5.15
+        version: 8.5.15
       prettier:
         specifier: ^3.8.3
         version: 3.8.4