diff --git a/package-lock.json b/package-lock.json
index e57afdbf0..1fc77546f 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -30,7 +30,7 @@
         "jest": "^30.2.0",
         "jest-silent-reporter": "^0.5.0",
         "less": "^4.2.2",
-        "postcss": "^8.4.35",
+        "postcss": "^8.5.13",
         "postcss-cli": "^11.0.0",
         "prettier": "^3.5.3",
         "ts-jest": "^29.3.0",
@@ -94,7 +94,6 @@
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       "dev": true,
       "license": "MIT",
-      "peer": true,
       "dependencies": {
         "@babel/code-frame": "^7.29.0",
         "@babel/generator": "^7.29.0",
@@ -2311,7 +2310,6 @@
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       "dev": true,
       "license": "MIT",
-      "peer": true,
       "dependencies": {
         "@typescript-eslint/scope-manager": "8.59.1",
         "@typescript-eslint/types": "8.59.1",
@@ -2792,7 +2790,6 @@
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       "dev": true,
       "license": "MIT",
-      "peer": true,
       "bin": {
         "acorn": "bin/acorn"
       },
@@ -3328,7 +3325,6 @@
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       "license": "MIT",
-      "peer": true,
       "dependencies": {
         "baseline-browser-mapping": "^2.10.12",
         "caniuse-lite": "^1.0.30001782",
@@ -4701,7 +4697,6 @@
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       "dev": true,
       "license": "MIT",
-      "peer": true,
       "dependencies": {
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         "@eslint-community/regexpp": "^4.12.1",
@@ -4762,7 +4757,6 @@
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       "dev": true,
       "license": "MIT",
-      "peer": true,
       "bin": {
         "eslint-config-prettier": "bin/cli.js"
       },
@@ -6783,7 +6777,6 @@
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       "dev": true,
       "license": "MIT",
-      "peer": true,
       "dependencies": {
         "@jest/core": "30.3.0",
         "@jest/types": "30.3.0",
@@ -8860,7 +8853,6 @@
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       "dev": true,
       "license": "MIT",
-      "peer": true,
       "engines": {
         "node": ">=12"
       },
@@ -9015,9 +9007,9 @@
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     },
     "node_modules/postcss": {
-      "version": "8.5.12",
-      "resolved": "https://registry.npmjs.org/postcss/-/postcss-8.5.12.tgz",
-      "integrity": "sha512-W62t/Se6rA0Az3DfCL0AqJwXuKwBeYg6nOaIgzP+xZ7N5BFCI7DYi1qs6ygUYT6rvfi6t9k65UMLJC+PHZpDAA==",
+      "version": "8.5.13",
+      "resolved": "https://registry.npmjs.org/postcss/-/postcss-8.5.13.tgz",
+      "integrity": "sha512-qif0+jGGZoLWdHey3UFHHWP0H7Gbmsk8T5VEqyYFbWqPr1XqvLGBbk/sl8V5exGmcYJklJOhOQq1pV9IcsiFag==",
       "dev": true,
       "funding": [
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@@ -9034,7 +9026,6 @@
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       "license": "MIT",
-      "peer": true,
       "dependencies": {
         "nanoid": "^3.3.11",
         "picocolors": "^1.1.1",
@@ -9624,7 +9615,6 @@
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       "dev": true,
       "license": "MIT",
-      "peer": true,
       "bin": {
         "prettier": "bin/prettier.cjs"
       },
@@ -11315,7 +11305,6 @@
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       "dev": true,
       "license": "Apache-2.0",
-      "peer": true,
       "dependencies": {
         "@gerrit0/mini-shiki": "^3.23.0",
         "lunr": "^2.3.9",
@@ -11353,7 +11342,6 @@
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       "dev": true,
       "license": "Apache-2.0",
-      "peer": true,
       "bin": {
         "tsc": "bin/tsc",
         "tsserver": "bin/tsserver"
diff --git a/package.json b/package.json
index 47435ee89..c788f6153 100644
--- a/package.json
+++ b/package.json
@@ -149,7 +149,7 @@
     "jest": "^30.2.0",
     "jest-silent-reporter": "^0.5.0",
     "less": "^4.2.2",
-    "postcss": "^8.4.35",
+    "postcss": "^8.5.13",
     "postcss-cli": "^11.0.0",
     "prettier": "^3.5.3",
     "ts-jest": "^29.3.0",