diff --git a/CHANGELOG.md b/CHANGELOG.md
index ff829d8..8b4b821 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,12 @@
 # Change Log
 
+## [9.0.0][] - 2024-08-14
+
+- Update eslint to 9.x: Rewrite rules to plain format
+- Drop node.js 18.x support and add node.js 22 support
+- Update repository structure, CI, and badges
+- Update dependencies and package file structure
+
 ## [8.2.1][] - 2023-07-20
 
 - Update dependencies and package file structure
diff --git a/README.md b/README.md
index 1e5ff42..e72cfeb 100644
--- a/README.md
+++ b/README.md
@@ -1,51 +1,40 @@
 # eslint-config-metarhia
 
-[![Build Status][travis-badge]][travis-url]
-[![Greenkeeper badge](https://badges.greenkeeper.io/metarhia/eslint-config-metarhia.svg)](https://greenkeeper.io/)
+Opinionated [ESLint](https://eslint.org/) config and de-facto JavaScript
+styleguide for [Metarhia](https://github.com/metarhia/) projects.
 
-Opinionated [ESLint][] config and de-facto JavaScript styleguide for
-[Metarhia][] projects.
+[![ci status](https://github.com/metarhia/eslint-config-metarhia/workflows/Testing%20CI/badge.svg)](https://github.com/metarhia/eslint-config-metarhia/actions?query=workflow%3A%22Testing+CI%22+branch%3Amaster)
+[![snyk](https://snyk.io/test/github/metarhia/eslint-config-metarhia/badge.svg)](https://snyk.io/test/github/metarhia/eslint-config-metarhia)
+[![npm version](https://badge.fury.io/js/eslint-config-metarhia.svg)](https://badge.fury.io/js/eslint-config-metarhia)
+[![npm downloads/month](https://img.shields.io/npm/dm/eslint-config-metarhia.svg)](https://www.npmjs.com/package/eslint-config-metarhia)
+[![npm downloads](https://img.shields.io/npm/dt/eslint-config-metarhia.svg)](https://www.npmjs.com/package/eslint-config-metarhia)
 
 ## Usage
 
-1. Install ESLint, this config and required plugins:
+1. Install ESLint and this config:
 
-   ```console
-   npm i -D eslint eslint-plugin-import eslint-config-metarhia
-   ```
-
-2. Add `"extends": "metarhia"` to your `.eslintrc`.
-
-## Contributing
-
-Please adhere to [Conventional Commits][] styleguide for commit messages
-(`npm install` creates a Git hook that lints your commit messages, and they are
-also checked on CI, but please write them properly beforehand so that they don't
-get rejected. If that happens locally while committing, though, don't worry,
-your commit message isn't lost, you can still find it in `.git/COMMIT_EDITMSG`).
+```console
+npm i -D eslint eslint-config-metarhia
+```
 
-### Releasing
+2. Import `eslint-config-metarhia` in `.eslint.config.js`, add additional rules,
+   export everything together.
 
-Collaborators can release new versions using
+```js
+const config = require('eslint-config-metarhia');
 
-```console
-npm run release
-git push origin master --follow-tags
-npm publish
+module.exports = [
+  config,
+  {
+    rules: {
+      'no-unused-vars': 'warn',
+    },
+  },
+];
 ```
 
-This will update the version in `package.json` and `package-lock.json`
-according to semantic versioning using commit messages to determine whether it
-is a patch, minor or major release, update the changelog, tag the new version
-in Git, and publish it to npm registry.
-
 ## License
 
-MIT. See the [LICENSE][] file for details.
-
-[conventional commits]: https://conventionalcommits.org/
-[eslint]: https://eslint.org/
-[license]: LICENSE
-[metarhia]: https://github.com/metarhia
-[travis-badge]: https://travis-ci.org/metarhia/eslint-config-metarhia.svg?branch=master
-[travis-url]: https://travis-ci.org/metarhia/eslint-config-metarhia
+Copyright (c) 2017-2024 [Metarhia contributors](https://github.com/metarhia/eslint-config-metarhia/graphs/contributors).
+eslint-config-metarhia is [MIT licensed](./LICENSE).\
+eslint-config-metarhia is a part of [Metarhia](https://github.com/metarhia) technology stack.
diff --git a/SECURITY.md b/SECURITY.md
index 36f7349..65f5242 100644
--- a/SECURITY.md
+++ b/SECURITY.md
@@ -9,6 +9,7 @@
 | 8.0.x   | :x:                |
 | 8.1.x   | :x:                |
 | 8.2.x   | :white_check_mark: |
+| 9.0.x   | :white_check_mark: |
 
 ## Reporting a Vulnerability
 
diff --git a/package-lock.json b/package-lock.json
index e01c797..469638d 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,12 +1,12 @@
 {
   "name": "eslint-config-metarhia",
-  "version": "8.2.2",
+  "version": "9.0.0",
   "lockfileVersion": 3,
   "requires": true,
   "packages": {
     "": {
       "name": "eslint-config-metarhia",
-      "version": "8.2.2",
+      "version": "9.0.0",
       "license": "MIT",
       "devDependencies": {
         "eslint": "^9.9.0",
@@ -15,7 +15,7 @@
         "prettier": "^3.1.0"
       },
       "engines": {
-        "node": "18 || 20 || 21 || 22"
+        "node": "20 || 21 || 22"
       },
       "funding": {
         "type": "patreon",
diff --git a/package.json b/package.json
index 4973fdf..39fdb54 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "eslint-config-metarhia",
-  "version": "8.2.2",
+  "version": "9.0.0",
   "author": "Alexey Orlenko <eaglexrlnk@gmail.com>",
   "license": "MIT",
   "description": "ESLint config for Metarhia projects",
@@ -16,7 +16,7 @@
   "main": "index.js",
   "files": ["rules/", "scripts/"],
   "engines": {
-    "node": "18 || 20 || 21 || 22"
+    "node": "20 || 21 || 22"
   },
   "repository": {
     "type": "git",