diff --git a/playground/css-lightningcss-proxy/package.json b/playground/css-lightningcss-proxy/package.json
index 31256ff0932240..c0eb81eccb5e83 100644
--- a/playground/css-lightningcss-proxy/package.json
+++ b/playground/css-lightningcss-proxy/package.json
@@ -9,7 +9,7 @@
     "preview": "vite preview"
   },
   "devDependencies": {
-    "lightningcss": "^1.21.4",
+    "lightningcss": "^1.21.5",
     "express": "^4.18.2"
   }
 }
diff --git a/pnpm-lock.yaml b/pnpm-lock.yaml
index 435fcc75da42eb..78ac740bfdfd7e 100644
--- a/pnpm-lock.yaml
+++ b/pnpm-lock.yaml
@@ -551,8 +551,8 @@ importers:
         specifier: ^4.18.2
         version: 4.18.2
       lightningcss:
-        specifier: ^1.21.4
-        version: 1.21.4
+        specifier: ^1.21.5
+        version: 1.21.5
 
   playground/css-sourcemap:
     devDependencies: