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 b749c3e..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: ['warn']
diff --git a/.prettierrc.yml b/.prettierrc.yml
deleted file mode 100644
index 8ded5e0..0000000
--- a/.prettierrc.yml
+++ /dev/null
@@ -1,2 +0,0 @@
-singleQuote: true
-semi: false
diff --git a/.release b/.release
index afb1db8..7307651 160000
--- a/.release
+++ b/.release
@@ -1 +1 @@
-Subproject commit afb1db801607dda5e859f39b600f0dd0111e4651
+Subproject commit 73076513e83c2057a32515831b638771c15b1d83
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 42fc052..d89d8b8 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,14 @@
+# Changelog
+
+The format is based on [Keep a Changelog](https://keepachangelog.com/).
+
 ### Unreleased
 
+### [1.2.3] - 2025-02-02
+
+- dep(eslint): upgrade to v9
+- prettier: move config into package.json
+
 ### [1.2.2] - 2024-08-05
 
 - chore: populate [files] in package.json. Delete .npmignore.
@@ -28,7 +37,9 @@
 - Import from Haraka
 - convert tests to mocha
 
-[1.1.0]: https://github.com/haraka/message-stream/releases/tag/1.1.0
-[1.2.0]: https://github.com/haraka/message-stream/releases/tag/1.2.0
-[1.2.1]: https://github.com/haraka/message-stream/releases/tag/1.2.1
-[1.2.2]: https://github.com/haraka/message-stream/releases/tag/1.2.2
+[1.1.0]: https://github.com/haraka/message-stream/releases/tag/v1.1.0
+[1.2.0]: https://github.com/haraka/message-stream/releases/tag/v1.2.0
+[1.2.1]: https://github.com/haraka/message-stream/releases/tag/v1.2.1
+[1.2.2]: https://github.com/haraka/message-stream/releases/tag/v1.2.2
+[1.2.3]: https://github.com/haraka/message-stream/releases/tag/v1.2.3
+[1.0.0]: https://github.com/haraka/message-stream/releases/tag/v1.0.0
diff --git a/CONTRIBUTORS.md b/CONTRIBUTORS.md
index ed8887d..c1bfa38 100644
--- a/CONTRIBUTORS.md
+++ b/CONTRIBUTORS.md
@@ -2,7 +2,8 @@
 
 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/message-stream/commits?author=msimerson">5</a>) |
+| <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/message-stream/commits?author=msimerson">6</a>) |
 | :--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------: |
 
-<sub>this file is maintained by [.release](https://github.com/msimerson/.release)</sub>
+<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 5ec113f..d661c6f 100644
--- a/README.md
+++ b/README.md
@@ -1,6 +1,5 @@
 [![CI Test Status][ci-img]][ci-url]
 [![Code Climate][clim-img]][clim-url]
-[![NPM][npm-img]][npm-url]
 
 # haraka-message-stream
 
@@ -21,5 +20,3 @@ new MessageStream(cfg, uuid, header_list)
 [ci-url]: https://github.com/haraka/message-stream/actions/workflows/ci.yml
 [clim-img]: https://codeclimate.com/github/haraka/message-stream/badges/gpa.svg
 [clim-url]: https://codeclimate.com/github/haraka/message-stream
-[npm-img]: https://nodei.co/npm/haraka-message-stream.png
-[npm-url]: https://www.npmjs.com/package/haraka-message-stream
diff --git a/eslint.config.mjs b/eslint.config.mjs
new file mode 100644
index 0000000..0377960
--- /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': ['warn'],
+    },
+  },
+]
diff --git a/package.json b/package.json
index 1cd9ac8..16f2c55 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "haraka-message-stream",
-  "version": "1.2.2",
+  "version": "1.2.3",
   "description": "Haraka email message stream",
   "main": "index.js",
   "files": [
@@ -8,11 +8,11 @@
   ],
   "scripts": {
     "format": "npm run prettier:fix && npm run lint:fix",
-    "lint": "npx eslint@^8 *.js test",
-    "lintfix": "npx eslint@^8 --fix *.js test",
+    "lint": "npx eslint@^9 *.js test",
+    "lint:fix": "npx eslint@^9 --fix *.js test",
     "prettier": "npx prettier . --check",
     "prettier:fix": "npx prettier . --write --log-level=warn",
-    "test": "npx mocha@^10",
+    "test": "npx mocha@^11",
     "versions": "npx dependency-version-checker check",
     "versions:fix": "npx dependency-version-checker update && npm run prettier:fix"
   },
@@ -32,8 +32,12 @@
   },
   "homepage": "https://github.com/haraka/message-stream#readme",
   "devDependencies": {
-    "@haraka/eslint-config": "^1.1.3",
-    "haraka-test-fixtures": "^1.3.3"
+    "@haraka/eslint-config": "^2.0.2",
+    "haraka-test-fixtures": "^1.3.9"
   },
-  "dependencies": {}
+  "dependencies": {},
+  "prettier": {
+    "singleQuote": true,
+    "semi": false
+  }
 }