diff --git a/package-lock.json b/package-lock.json
index eb6e516..a893090 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -5258,35 +5258,6 @@
         "node": ">= 0.4"
       }
     },
-    "node_modules/postcss": {
-      "version": "8.5.25",
-      "resolved": "https://registry.npmjs.org/postcss/-/postcss-8.5.25.tgz",
-      "integrity": "sha512-DTPx3RWSSnWyzLxQnlH0rJP+EW5ekl16ZU4/psbIhA0e53kJfdgaN5vKM+xP7yJtXVu+nfdVFmlgFDEKAe4Pyw==",
-      "dev": true,
-      "funding": [
-        {
-          "type": "opencollective",
-          "url": "https://opencollective.com/postcss/"
-        },
-        {
-          "type": "tidelift",
-          "url": "https://tidelift.com/funding/github/npm/postcss"
-        },
-        {
-          "type": "github",
-          "url": "https://github.com/sponsors/ai"
-        }
-      ],
-      "license": "MIT",
-      "dependencies": {
-        "nanoid": "^3.3.16",
-        "picocolors": "^1.1.1",
-        "source-map-js": "^1.2.1"
-      },
-      "engines": {
-        "node": "^10 || ^12 || >=14"
-      }
-    },
     "node_modules/prelude-ls": {
       "version": "1.2.1",
       "resolved": "https://registry.npmjs.org/prelude-ls/-/prelude-ls-1.2.1.tgz",
@@ -6378,6 +6349,35 @@
         "url": "https://github.com/sponsors/jonschlinkert"
       }
     },
+    "node_modules/vite/node_modules/postcss": {
+      "version": "8.5.23",
+      "resolved": "https://registry.npmjs.org/postcss/-/postcss-8.5.23.tgz",
+      "integrity": "sha512-g50586zr4bZmwFiTlflMu8E0bDTb5I5gertgwAKmsdUlTQIhZtunzUlD1WSzwcVWPoAVpsrA6vlfCD7oXvRwgg==",
+      "dev": true,
+      "funding": [
+        {
+          "type": "opencollective",
+          "url": "https://opencollective.com/postcss/"
+        },
+        {
+          "type": "tidelift",
+          "url": "https://tidelift.com/funding/github/npm/postcss"
+        },
+        {
+          "type": "github",
+          "url": "https://github.com/sponsors/ai"
+        }
+      ],
+      "license": "MIT",
+      "dependencies": {
+        "nanoid": "^3.3.16",
+        "picocolors": "^1.1.1",
+        "source-map-js": "^1.2.1"
+      },
+      "engines": {
+        "node": "^10 || ^12 || >=14"
+      }
+    },
     "node_modules/vitest": {
       "version": "4.1.10",
       "resolved": "https://registry.npmjs.org/vitest/-/vitest-4.1.10.tgz",
diff --git a/package.json b/package.json
index 80be2e8..9498366 100644
--- a/package.json
+++ b/package.json
@@ -29,6 +29,9 @@
     "markdownlint-cli2": "^0.23.1",
     "vitest": "^4.1.9"
   },
+  "overrides": {
+    "postcss": "8.5.23"
+  },
   "repository": {
     "type": "git",
     "url": "git+https://github.com/github/markdownlint-github.git"