diff --git a/package-lock.json b/package-lock.json
index b96579b68..1679993e7 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -41,7 +41,7 @@
         "jsdom": "^26.1.0",
         "lint-staged": "^16.1.2",
         "neostandard": "^0.12.2",
-        "postcss": "^8.4.49",
+        "postcss": "^8.5.12",
         "postcss-scss": "^4.0.9",
         "prettier": "^3.5.3",
         "sortablejs": "^1.15.6",
@@ -28315,9 +28315,9 @@
       }
     },
     "node_modules/postcss": {
-      "version": "8.5.8",
-      "resolved": "https://registry.npmjs.org/postcss/-/postcss-8.5.8.tgz",
-      "integrity": "sha512-OW/rX8O/jXnm82Ey1k44pObPtdblfiuWnrd8X7GJ7emImCOstunGbXUpp7HdBrFQX6rJzn3sPT397Wp5aCwCHg==",
+      "version": "8.5.12",
+      "resolved": "https://registry.npmjs.org/postcss/-/postcss-8.5.12.tgz",
+      "integrity": "sha512-W62t/Se6rA0Az3DfCL0AqJwXuKwBeYg6nOaIgzP+xZ7N5BFCI7DYi1qs6ygUYT6rvfi6t9k65UMLJC+PHZpDAA==",
       "funding": [
         {
           "type": "opencollective",
diff --git a/package.json b/package.json
index 76b0bdb21..37a9ec42b 100644
--- a/package.json
+++ b/package.json
@@ -64,7 +64,7 @@
     "jsdom": "^26.1.0",
     "lint-staged": "^16.1.2",
     "neostandard": "^0.12.2",
-    "postcss": "^8.4.49",
+    "postcss": "^8.5.12",
     "postcss-scss": "^4.0.9",
     "prettier": "^3.5.3",
     "sortablejs": "^1.15.6",