diff --git a/package-lock.json b/package-lock.json
index 3444e3fca9ba..2e56fef03397 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -52,7 +52,7 @@
         "license-checker": "25.0.1",
         "lit-analyzer": "2.0.3",
         "mocha": "9.2.2",
-        "postcss": "8.5.1",
+        "postcss": "8.5.15",
         "puppeteer-core": "24.1.1",
         "rollup-plugin-sourcemaps2": "0.4.2",
         "sinon": "19.0.2",
@@ -7550,9 +7550,9 @@
       }
     },
     "node_modules/postcss": {
-      "version": "8.5.1",
-      "resolved": "https://npm.skia.org/chrome-devtools/postcss/-/postcss-8.5.1.tgz",
-      "integrity": "sha512-6oz2beyjc5VMn/KV1pPw8fliQkhBXrVn1Z3TVyqZxU8kZpzEKhBdmCFqI6ZbmGtamQvQGuU1sgPTk8ZrXDD7jQ==",
+      "version": "8.5.15",
+      "resolved": "https://npm.skia.org/chrome-devtools/postcss/-/postcss-8.5.15.tgz",
+      "integrity": "sha512-FfR8sjd4em2T6fb3I2MwAJU7HWVMr9zba+enmQeeWFfCbm+UOC/0X4DS8XtpUTMwWMGbjKYP7xjfNekzyGmB3A==",
       "dev": true,
       "funding": [
         {
@@ -7570,7 +7570,7 @@
       ],
       "license": "MIT",
       "dependencies": {
-        "nanoid": "^3.3.8",
+        "nanoid": "^3.3.12",
         "picocolors": "^1.1.1",
         "source-map-js": "^1.2.1"
       },
@@ -9483,35 +9483,6 @@
       "dev": true,
       "license": "CC0-1.0"
     },
-    "node_modules/stylelint/node_modules/postcss": {
-      "version": "8.5.3",
-      "resolved": "https://npm.skia.org/chrome-devtools/postcss/-/postcss-8.5.3.tgz",
-      "integrity": "sha512-dle9A3yYxlBSrt8Fu+IpjGT8SY8hN0mlaA6GY8t0P5PjIOZemULz/E2Bnm/2dcUOena75OTNkHI76uZBNUUq3A==",
-      "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": "^3.3.8",
-        "picocolors": "^1.1.1",
-        "source-map-js": "^1.2.1"
-      },
-      "engines": {
-        "node": "^10 || ^12 || >=14"
-      }
-    },
     "node_modules/stylelint/node_modules/resolve-from": {
       "version": "5.0.0",
       "dev": true,
diff --git a/package.json b/package.json
index ec09d0e53b1f..5ef271716f49 100644
--- a/package.json
+++ b/package.json
@@ -79,7 +79,7 @@
     "license-checker": "25.0.1",
     "lit-analyzer": "2.0.3",
     "mocha": "9.2.2",
-    "postcss": "8.5.1",
+    "postcss": "8.5.15",
     "puppeteer-core": "24.1.1",
     "rollup-plugin-sourcemaps2": "0.4.2",
     "sinon": "19.0.2",