diff --git a/apps/admin-x-design-system/package.json b/apps/admin-x-design-system/package.json
index ad74ca2364b..8bf890636c0 100644
--- a/apps/admin-x-design-system/package.json
+++ b/apps/admin-x-design-system/package.json
@@ -50,7 +50,7 @@
         "glob": "^10.5.0",
         "jsdom": "28.1.0",
         "lodash-es": "4.18.1",
-        "postcss": "8.5.6",
+        "postcss": "8.5.10",
         "postcss-import": "16.1.1",
         "react": "18.3.1",
         "react-dom": "18.3.1",
diff --git a/apps/comments-ui/package.json b/apps/comments-ui/package.json
index 16bb1c35977..a591226e93b 100644
--- a/apps/comments-ui/package.json
+++ b/apps/comments-ui/package.json
@@ -78,7 +78,7 @@
     "eslint-plugin-tailwindcss": "3.18.2",
     "jsdom": "28.1.0",
     "moment": "2.30.1",
-    "postcss": "8.5.6",
+    "postcss": "8.5.10",
     "sinon": "^21.1.1",
     "tailwindcss": "3.4.18",
     "vite": "5.4.21",
diff --git a/apps/shade/package.json b/apps/shade/package.json
index bd5cc275f8b..0312a7185f0 100644
--- a/apps/shade/package.json
+++ b/apps/shade/package.json
@@ -95,7 +95,7 @@
         "glob": "^10.5.0",
         "jsdom": "28.1.0",
         "lodash-es": "4.18.1",
-        "postcss": "8.5.6",
+        "postcss": "8.5.10",
         "rollup-plugin-node-builtins": "2.1.2",
         "sinon": "18.0.1",
         "storybook": "10.3.5",
diff --git a/apps/signup-form/package.json b/apps/signup-form/package.json
index d795a41be24..2d5524eed31 100644
--- a/apps/signup-form/package.json
+++ b/apps/signup-form/package.json
@@ -52,7 +52,7 @@
     "eslint-plugin-react-refresh": "0.4.24",
     "eslint-plugin-tailwindcss": "3.18.2",
     "jsdom": "28.1.0",
-    "postcss": "8.5.6",
+    "postcss": "8.5.10",
     "postcss-import": "16.1.1",
     "prop-types": "15.8.1",
     "rollup-plugin-node-builtins": "2.1.2",
diff --git a/ghost/core/package.json b/ghost/core/package.json
index bff1a0e0b13..83a6a0a0bf8 100644
--- a/ghost/core/package.json
+++ b/ghost/core/package.json
@@ -291,7 +291,7 @@
     "nodemon": "3.1.14",
     "papaparse": "5.5.3",
     "parse-prometheus-text-format": "1.1.1",
-    "postcss": "8.5.6",
+    "postcss": "8.5.10",
     "postcss-cli": "11.0.1",
     "rewire": "9.0.1",
     "sinon": "18.0.1",