diff --git a/src/client/package.json b/src/client/package.json
index 0639d5c..61ed34e 100644
--- a/src/client/package.json
+++ b/src/client/package.json
@@ -27,7 +27,7 @@
     "cssnano": "7.0.6",
     "eslint": "9.20.1",
     "eslint-config-next": "15.1.7",
-    "postcss": "8.5.2",
+    "postcss": "8.5.3",
     "postcss-import": "16.1.0",
     "prettier": "3.5.1",
     "typescript": "5.7.3"
diff --git a/src/client/yarn.lock b/src/client/yarn.lock
index 4610f44..4184ff1 100644
--- a/src/client/yarn.lock
+++ b/src/client/yarn.lock
@@ -4726,10 +4726,10 @@ postcss@8.4.31:
     picocolors "^1.0.0"
     source-map-js "^1.0.2"
 
-postcss@8.5.2:
-  version "8.5.2"
-  resolved "https://registry.yarnpkg.com/postcss/-/postcss-8.5.2.tgz#e7b99cb9d2ec3e8dd424002e7c16517cb2b846bd"
-  integrity sha512-MjOadfU3Ys9KYoX0AdkBlFEF1Vx37uCCeN4ZHnmwm9FfpbsGWMZeBLMmmpY+6Ocqod7mkdZ0DT31OlbsFrLlkA==
+postcss@8.5.3:
+  version "8.5.3"
+  resolved "https://registry.yarnpkg.com/postcss/-/postcss-8.5.3.tgz#1463b6f1c7fb16fe258736cba29a2de35237eafb"
+  integrity sha512-dle9A3yYxlBSrt8Fu+IpjGT8SY8hN0mlaA6GY8t0P5PjIOZemULz/E2Bnm/2dcUOena75OTNkHI76uZBNUUq3A==
   dependencies:
     nanoid "^3.3.8"
     picocolors "^1.1.1"