diff --git a/.codeclimate.yml b/.codeclimate.yml
index c889eb8..563da6b 100644
--- a/.codeclimate.yml
+++ b/.codeclimate.yml
@@ -1,9 +1,9 @@
 engines:
   eslint:
     enabled: true
-    channel: 'eslint-8'
+    channel: 'eslint-9'
     config:
-      config: '.eslintrc.yaml'
+      config: 'eslint.config.mjs'
 
 ratings:
   paths:
diff --git a/.eslintrc.yaml b/.eslintrc.yaml
deleted file mode 100644
index 4c1bf2a..0000000
--- a/.eslintrc.yaml
+++ /dev/null
@@ -1,10 +0,0 @@
-env:
-  node: true
-  es6: true
-  mocha: true
-  es2022: true
-
-extends: ['@haraka']
-
-rules:
-  no-unused-vars: 1
diff --git a/.prettierrc b/.prettierrc
deleted file mode 100644
index 8ded5e0..0000000
--- a/.prettierrc
+++ /dev/null
@@ -1,2 +0,0 @@
-singleQuote: true
-semi: false
diff --git a/.release b/.release
index afb1db8..180d818 160000
--- a/.release
+++ b/.release
@@ -1 +1 @@
-Subproject commit afb1db801607dda5e859f39b600f0dd0111e4651
+Subproject commit 180d818a31f69b7f0295cd0eb85cb44c45439a8b
diff --git a/CHANGELOG.md b/CHANGELOG.md
index da7121a..fb6058c 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -4,10 +4,17 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/).
 
 ### Unreleased
 
+### [1.0.2] - 2025-01-30
+
+- replace .replace(//g) with a replaceAll
+- prettier: move config into package.json
+- dep(eslint): upgrade to v9
+- dep(all): bump versions
+- doc(CONTRIBUTORS): added
+
 ### [1.0.1] - 2024-11-04
 
 - Merge pull request #2 from lnedry/master
-
 - fix: removed redundant timer.
 - chore: remove unused set of conn.notes.prev_helo
 
@@ -15,5 +22,6 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/).
 
 - initial release
 
-[1.0.0]: https://github.com/haraka/haraka-plugin-template/releases/tag/v1.0.0
+[1.0.0]: https://github.com/haraka/haraka-plugin-helo.checks/releases/tag/v1.0.0
 [1.0.1]: https://github.com/haraka/haraka-plugin-helo.checks/releases/tag/v1.0.1
+[1.0.2]: https://github.com/haraka/haraka-plugin-helo.checks/releases/tag/v1.0.2
diff --git a/CONTRIBUTORS.md b/CONTRIBUTORS.md
new file mode 100644
index 0000000..aff93a2
--- /dev/null
+++ b/CONTRIBUTORS.md
@@ -0,0 +1,9 @@
+# Contributors
+
+This handcrafted artisinal software is brought to you by:
+
+| <img height="80" src="https://avatars.githubusercontent.com/u/261635?v=4"><br><a href="https://github.com/msimerson">msimerson</a> (<a href="https://github.com/haraka/haraka-plugin-helo.checks/commits?author=msimerson">7</a>) | <img height="80" src="https://avatars.githubusercontent.com/u/203240?v=4"><br><a href="https://github.com/lnedry">lnedry</a> (<a href="https://github.com/haraka/haraka-plugin-helo.checks/commits?author=lnedry">2</a>) |
+| :-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------: | :----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------: |
+
+<sub>this file is generated by [.release](https://github.com/msimerson/.release).
+Contribute to this project to get your GitHub profile included here.</sub>
diff --git a/README.md b/README.md
index b9c1f87..412b494 100644
--- a/README.md
+++ b/README.md
@@ -1,8 +1,6 @@
 [![CI Test Status][ci-img]][ci-url]
 [![Code Climate][clim-img]][clim-url]
 
-[![NPM][npm-img]][npm-url]
-
 # haraka-plugin-helo.checks
 
 This plugin performs a number of checks on the HELO string.
@@ -151,5 +149,3 @@ gmail.com=google.com
 [ci-url]: https://github.com/haraka/haraka-plugin-helo.checks/actions/workflows/ci.yml
 [clim-img]: https://codeclimate.com/github/haraka/haraka-plugin-helo.checks/badges/gpa.svg
 [clim-url]: https://codeclimate.com/github/haraka/haraka-plugin-helo.checks
-[npm-img]: https://nodei.co/npm/haraka-plugin-helo.checks.png
-[npm-url]: https://www.npmjs.com/package/haraka-plugin-helo.checks
diff --git a/eslint.config.mjs b/eslint.config.mjs
new file mode 100644
index 0000000..d9aaa82
--- /dev/null
+++ b/eslint.config.mjs
@@ -0,0 +1,29 @@
+import globals from 'globals'
+import path from 'node:path'
+import { fileURLToPath } from 'node:url'
+import js from '@eslint/js'
+import { FlatCompat } from '@eslint/eslintrc'
+
+const __filename = fileURLToPath(import.meta.url)
+const __dirname = path.dirname(__filename)
+const compat = new FlatCompat({
+  baseDirectory: __dirname,
+  recommendedConfig: js.configs.recommended,
+  allConfig: js.configs.all,
+})
+
+export default [
+  ...compat.extends('@haraka'),
+  {
+    languageOptions: {
+      globals: {
+        ...globals.node,
+        ...globals.mocha,
+      },
+    },
+
+    rules: {
+      'no-unused-vars': 1,
+    },
+  },
+]
diff --git a/index.js b/index.js
index 18bb1c7..138e7c8 100644
--- a/index.js
+++ b/index.js
@@ -320,7 +320,7 @@ exports.big_company = function (next, connection, helo) {
 
   const allowed_rdns = this.cfg.bigco[helo].split(/,/)
   for (const allow of allowed_rdns) {
-    const re = new RegExp(`${allow.replace(/\./g, '\\.')}$`)
+    const re = new RegExp(`${allow.replaceAll('.', '\\.')}$`)
     if (re.test(rdns)) {
       connection.results.add(this, { pass: 'big_co' })
       return next()
diff --git a/package.json b/package.json
index a5d47d5..3d2256f 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "haraka-plugin-helo.checks",
-  "version": "1.0.1",
+  "version": "1.0.2",
   "description": "Haraka plugin checks the HELO string.",
   "main": "index.js",
   "files": [
@@ -9,8 +9,8 @@
   ],
   "scripts": {
     "format": "npm run prettier:fix && npm run lint:fix",
-    "lint": "npx eslint@^8 *.js test",
-    "lint:fix": "npx eslint@^8 *.js test --fix",
+    "lint": "npx eslint@^9 *.js test",
+    "lint:fix": "npx eslint@^9 *.js test --fix",
     "prettier": "npx prettier . --check",
     "prettier:fix": "npx prettier . --write --log-level=warn",
     "test": "node --test",
@@ -32,12 +32,16 @@
   },
   "homepage": "https://github.com/haraka/haraka-plugin-helo.checks#readme",
   "devDependencies": {
-    "@haraka/eslint-config": "1.1.5",
+    "@haraka/eslint-config": "^2.0.2",
     "haraka-test-fixtures": "1.3.8"
   },
   "dependencies": {
-    "haraka-net-utils": "^1.7.0",
-    "haraka-tld": "^1.2.2",
+    "haraka-net-utils": "^1.7.1",
+    "haraka-tld": "^1.2.3",
     "haraka-utils": "^1.1.3"
+  },
+  "prettier": {
+    "singleQuote": true,
+    "semi": false
   }
-}
\ No newline at end of file
+}
diff --git a/test/index.js b/test/index.js
index 006f14c..65a49da 100644
--- a/test/index.js
+++ b/test/index.js
@@ -334,8 +334,8 @@ describe('helo.checks', () => {
     beforeEach(_set_up)
 
     it('pass, reject=false', (t, done) => {
-      const test_helo = 'yahoo.com'
-      this.connection.remote.host = 'yahoo.com'
+      const test_helo = 'yahoo.co.jp'
+      this.connection.remote.host = 'yahoo.co.jp'
       this.plugin.cfg.check.big_company = true
       this.plugin.cfg.reject.big_company = true
       this.plugin.big_company(