diff --git a/.stylelintrc b/.stylelintrc
index 6cd8ecd2c98..594ca3ac82c 100644
--- a/.stylelintrc
+++ b/.stylelintrc
@@ -1,7 +1,7 @@
 {
 	"extends": "stylelint-config-ckeditor5",
 	"plugins": [
-		"stylelint-plugin-ckeditor5-rules/lib/license-header"
+		"stylelint-plugin-ckeditor5-rules"
 	],
 	"ignoreFiles": [
 		"**/dist/**",
diff --git a/docs/framework/contributing/code-style.md b/docs/framework/contributing/code-style.md
index 7505f7f48fa..2021ae9d54f 100644
--- a/docs/framework/contributing/code-style.md
+++ b/docs/framework/contributing/code-style.md
@@ -1228,3 +1228,29 @@ This rule ensures that SVG files are imported and exported only in the `@ckedito
 ### Valid changelog entries
 
 This rule ensures that changelog entry files are populated with proper data and a clear description of the change. For a full guide on how to populate changelog entries, see the {@link framework/contributing/changelog-entries Changelog entries} guide.
+
+## CKEditor 5 custom Stylelint rules
+
+In addition to the rules provided by Stylelint, CKEditor 5 uses a few custom rules described below.
+
+### Names of CSS variables within `.ck-content`: `ckeditor5-rules/ck-content-variable-name`
+
+This rule aims to enforce convention of all variables targeting styling of elements within the editor (`.ck-content`) using a common prefix (`--ck-content-*`) 
+
+👎  Example of incorrect code for this rule:
+
+```css
+.ck-content {
+	width: var(--variable-name);
+}
+```
+
+👍  Example of correct code for this rule:
+
+```css
+.ck-content {
+	width: var(--ck-content-variable-name);
+}
+```
+
+[History of the change.](https://github.com/ckeditor/ckeditor5/issues/18805)
diff --git a/package.json b/package.json
index ff2ce978395..27a0528caf0 100644
--- a/package.json
+++ b/package.json
@@ -135,9 +135,9 @@
     "date-fns": "^4.0.0",
     "esbuild": "^0.25.0",
     "eslint": "^9.26.0",
-    "eslint-config-ckeditor5": "^11.0.0",
+    "eslint-config-ckeditor5": "^12.0.0",
     "eslint-formatter-stylish": "^8.40.0",
-    "eslint-plugin-ckeditor5-rules": "^11.0.0",
+    "eslint-plugin-ckeditor5-rules": "^12.0.0",
     "eslint-plugin-import": "^2.31.0",
     "estree-walker": "^3.0.3",
     "fs-extra": "^11.0.0",
@@ -160,7 +160,7 @@
     "schema-utils": "^4.2.0",
     "sharp": "^0.34.2",
     "stylelint": "^16.0.0",
-    "stylelint-config-ckeditor5": "^11.0.0",
+    "stylelint-config-ckeditor5": "^12.0.0",
     "svgo": "^3.3.2",
     "table": "^6.8.1",
     "terser-webpack-plugin": "^5.0.0",