diff --git a/.github/workflows/dependabot-auto-merge.yml b/.github/workflows/auto-merge.yml
similarity index 94%
rename from .github/workflows/dependabot-auto-merge.yml
rename to .github/workflows/auto-merge.yml
index 2578d63af..9325d4c4c 100644
--- a/.github/workflows/dependabot-auto-merge.yml
+++ b/.github/workflows/auto-merge.yml
@@ -1,4 +1,4 @@
-name: pill-request-auto-merge
+name: pull-request-auto-merge
 
 on:
   pull_request:
diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 1d4f26f3f..acd748743 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -14,7 +14,7 @@ jobs:
   build:
     strategy:
       matrix:
-        node-version: [20.x]
+        node-version: [22.x]
 
     runs-on: ubuntu-latest
     steps:
@@ -34,7 +34,7 @@ jobs:
             cwd: ./example/app
             args: [--no-frozen-lockfile]
         package_json_file: example/app/package.json
-        
+
     - name: Build (example/app)
       working-directory: example/app
       run: pnpm lint && pnpm build
@@ -42,7 +42,7 @@ jobs:
   build-backend:
     strategy:
       matrix:
-        node-version: [20.x]
+        node-version: [22.x]
 
     runs-on: ubuntu-latest
     steps:
@@ -62,10 +62,12 @@ jobs:
             cwd: ./package
             args: [--no-frozen-lockfile]
         package_json_file: package/package.json
-        
+
+    - uses: oven-sh/setup-bun@v2
+
     - name: Build (package)
       working-directory: package
-      run: pnpm lint && pnpm build
+      run: bun run --bun lint && bun run --bun build
 
     - uses: pnpm/action-setup@v4
       name: Install pnpm (example/app)
diff --git a/.github/workflows/deploy.yml b/.github/workflows/deploy.yml
index e382f165c..ff47cc19e 100644
--- a/.github/workflows/deploy.yml
+++ b/.github/workflows/deploy.yml
@@ -24,7 +24,7 @@ jobs:
   test:
     strategy:
       matrix:
-        node-version: [20.x]
+        node-version: [22.x]
 
     runs-on: ubuntu-latest
     steps:
diff --git a/.github/workflows/enable-auto-merge.yml b/.github/workflows/enable-auto-merge.yml
deleted file mode 100644
index 98ac33d08..000000000
--- a/.github/workflows/enable-auto-merge.yml
+++ /dev/null
@@ -1,27 +0,0 @@
-name: enables auto merge
-
-on:
-  pull_request:
-    branches:
-      - main
-
-permissions:
-  id-token: write
-  contents: read
-
-jobs:
-  configure:
-    runs-on: ubuntu-latest
-
-    if: github.actor != 'dependabot[bot]'
-
-    steps:
-    - name: Pull request auto merge enabler
-      if: github.event_name == 'pull_request'
-      uses: poad/github-pull-request-auto-merge-enable-action@v2
-      with:
-        pull_request_number: ${{ github.event.pull_request.number }}
-        github_token: ${{ secrets.PERSONAL_TOKEN_FOR_GITHUB_ACTIONS }}
-        repository: ${{ github.event.repository.name }}
-        owner: ${{ github.repository_owner }}
-        merge_method: SQUASH
diff --git a/example/app/.prettierignore b/example/app/.prettierignore
deleted file mode 100644
index fc6b86e7d..000000000
--- a/example/app/.prettierignore
+++ /dev/null
@@ -1,2 +0,0 @@
-*.d.ts
-*.js
diff --git a/example/app/.prettierrc.json b/example/app/.prettierrc.json
deleted file mode 100644
index 1d94e832c..000000000
--- a/example/app/.prettierrc.json
+++ /dev/null
@@ -1,5 +0,0 @@
-{
-  "semi": true,
-  "singleQuote": true,
-  "trailingComma": "all"
-}
\ No newline at end of file
diff --git a/example/app/eslint.config.mjs b/example/app/eslint.config.js
similarity index 81%
rename from example/app/eslint.config.mjs
rename to example/app/eslint.config.js
index 62e828b07..bdfa62243 100644
--- a/example/app/eslint.config.mjs
+++ b/example/app/eslint.config.js
@@ -1,25 +1,29 @@
+// @ts-check
+
+import { includeIgnoreFile } from '@eslint/compat';
+
 import nextPlugin from '@next/eslint-plugin-next';
 import reactPlugin from 'eslint-plugin-react';
 import hooksPlugin from 'eslint-plugin-react-hooks';
+// @ts-expect-error ignore type error
 import importPlugin from 'eslint-plugin-import';
 import stylistic from '@stylistic/eslint-plugin';
 import stylisticTs from '@stylistic/eslint-plugin-ts';
 import stylisticJsx from '@stylistic/eslint-plugin-jsx';
 import tseslint from 'typescript-eslint';
 
+import path from "node:path";
+import { fileURLToPath } from "node:url";
+
+const __filename = fileURLToPath(import.meta.url);
+const __dirname = path.dirname(__filename);
+const gitignorePath = path.resolve(__dirname, "./.gitignore");
+
 export default tseslint.config(
+  includeIgnoreFile(gitignorePath),
   ...tseslint.configs.strict,
   ...tseslint.configs.stylistic,
   {
-    ignores: [
-      './.next/*',
-      '**/*.d.ts',
-      '*.js',
-      'src/tsconfig.json',
-      'src/next-env.d.ts',
-      'src/stories',
-      'node_modules/**/*',
-    ],
     languageOptions: {
       parser: tseslint.parser,
     },
diff --git a/example/app/next.config.js b/example/app/next.config.ts
similarity index 59%
rename from example/app/next.config.js
rename to example/app/next.config.ts
index 938b6ba9b..a42b574c3 100644
--- a/example/app/next.config.js
+++ b/example/app/next.config.ts
@@ -1,5 +1,6 @@
-/** @type {import('next').NextConfig} */
-const config = {
+import { NextConfig } from "next";
+
+const config: NextConfig = {
   output: 'export',
   reactStrictMode: true,
   swcMinify: true,
@@ -9,4 +10,4 @@ const config = {
   },
 };
 
-module.exports = config;
+export default config;
diff --git a/example/app/package.json b/example/app/package.json
index 1d839a893..4815c6826 100644
--- a/example/app/package.json
+++ b/example/app/package.json
@@ -2,19 +2,14 @@
   "name": "examples",
   "version": "0.1.0",
   "private": true,
+  "type": "module",
   "scripts": {
     "dev": "next dev",
     "build": "next build",
     "start": "pnpm dlx serve@latest out",
     "release": "next build",
-    "style:check": "prettier --write src",
-    "style:fix": "prettier --write src",
-    "eslint:check": "eslint './src/**/*.{ts,tsx}'",
-    "eslint:fix": "eslint './src/**/*.{ts,tsx}' --fix",
-    "lint": "pnpm run --parallel /^.*:check/",
-    "lint-fix": "pnpm run /^.*:fix/",
-    "prebuild": "pnpm lint-fix",
-    "prestart": "pnpm build"
+    "lint": "eslint",
+    "lint-fix": "eslint --fix"
   },
   "dependencies": {
     "next": "^15.1.3",
@@ -23,6 +18,7 @@
     "web-vitals": "^4.2.4"
   },
   "devDependencies": {
+    "@eslint/compat": "^1.2.4",
     "@stylistic/eslint-plugin": "^2.12.1",
     "@stylistic/eslint-plugin-js": "^2.12.1",
     "@stylistic/eslint-plugin-jsx": "^2.12.1",
diff --git a/example/app/pnpm-lock.yaml b/example/app/pnpm-lock.yaml
index c65da960b..a70ce560c 100644
--- a/example/app/pnpm-lock.yaml
+++ b/example/app/pnpm-lock.yaml
@@ -21,6 +21,9 @@ importers:
         specifier: ^4.2.4
         version: 4.2.4
     devDependencies:
+      '@eslint/compat':
+        specifier: ^1.2.4
+        version: 1.2.4(eslint@9.17.0)
       '@stylistic/eslint-plugin':
         specifier: ^2.12.1
         version: 2.12.1(eslint@9.17.0)(typescript@5.7.2)
@@ -190,6 +193,15 @@ packages:
     resolution: {integrity: sha512-CCZCDJuduB9OUkFkY2IgppNZMi2lBQgD2qzwXkEia16cge2pijY/aXi96CJMquDMn3nJdlPV1A5KrJEXwfLNzQ==}
     engines: {node: ^12.0.0 || ^14.0.0 || >=16.0.0}
 
+  '@eslint/compat@1.2.4':
+    resolution: {integrity: sha512-S8ZdQj/N69YAtuqFt7653jwcvuUj131+6qGLUyDqfDg1OIoBQ66OCuXC473YQfO2AaxITTutiRQiDwoo7ZLYyg==}
+    engines: {node: ^18.18.0 || ^20.9.0 || >=21.1.0}
+    peerDependencies:
+      eslint: ^9.10.0
+    peerDependenciesMeta:
+      eslint:
+        optional: true
+
   '@eslint/config-array@0.19.1':
     resolution: {integrity: sha512-fo6Mtm5mWyKjA/Chy1BYTdn5mGJoDNjC7C64ug20ADsRDGrA85bN3uK3MaKbeRkRuuIEAR5N33Jr1pbm411/PA==}
     engines: {node: ^18.18.0 || ^20.9.0 || >=21.1.0}
@@ -1803,6 +1815,10 @@ snapshots:
 
   '@eslint-community/regexpp@4.12.1': {}
 
+  '@eslint/compat@1.2.4(eslint@9.17.0)':
+    optionalDependencies:
+      eslint: 9.17.0
+
   '@eslint/config-array@0.19.1':
     dependencies:
       '@eslint/object-schema': 2.1.5
diff --git a/example/app/tsconfig.json b/example/app/tsconfig.json
index 1a51dd784..1a9ddce4e 100644
--- a/example/app/tsconfig.json
+++ b/example/app/tsconfig.json
@@ -1,7 +1,7 @@
 {
   "compilerOptions": {
     "target": "esnext",
-    "module": "commonjs",
+    "module": "esnext",
     "lib": [
       "dom",
       "dom.iterable",
diff --git a/example/cdk/eslint.config.mjs b/example/cdk/eslint.config.mjs
deleted file mode 100644
index 0a4e3737f..000000000
--- a/example/cdk/eslint.config.mjs
+++ /dev/null
@@ -1,31 +0,0 @@
-import eslint from '@eslint/js';
-import plugin from '@stylistic/eslint-plugin';
-import stylistic from '@stylistic/eslint-plugin';
-import stylisticTs from '@stylistic/eslint-plugin-ts';
-import tseslint from 'typescript-eslint';
-
-export default tseslint.config(
-  eslint.configs.recommended,
-  ...tseslint.configs.strict,
-  ...tseslint.configs.stylistic,
-  {
-    languageOptions: {
-      parser: tseslint.parser,
-    },
-    files: ['**/*.ts'],
-    ignores: [
-      '**/*.d.ts',
-      '*.js',
-      'src/tsconfig.json',
-      'src/next-env.d.ts',
-      'src/stories',
-      'node_modules/**/*',
-    ],
-    plugins: {
-      '@stylistic': stylistic,
-      '@stylistic/ts': stylisticTs,
-    },
-    rules: {
-    },
-  },
-);
diff --git a/example/cdk/example-cdk.json b/example/cdk/example-cdk.json
index 6f4a219a8..d5ef385b3 100644
--- a/example/cdk/example-cdk.json
+++ b/example/cdk/example-cdk.json
@@ -1,5 +1,5 @@
 {
-  "app": "pnpx ts-node --prefer-ts-exts bin/github-oidc-proxy-example-cognito.ts",
+  "app": "pnpm dlx tsx bin/github-oidc-proxy-example-cognito.ts",
   "watch": {
     "include": [
       "**"
diff --git a/example/cdk/package.json b/example/cdk/package.json
index 38bf5dc34..26956105f 100644
--- a/example/cdk/package.json
+++ b/example/cdk/package.json
@@ -1,6 +1,7 @@
 {
   "name": "github-oidc-proxy-example-cognito",
   "version": "0.1.0",
+  "type": "module",
   "bin": {
     "cognito": "bin/github-oidc-proxy-example-cognito.js"
   },
@@ -10,10 +11,10 @@
     "test": "jest",
     "cdk": "cdk",
     "lint": "eslint './{bin,lib}/**/*.ts'",
-    "lint-fix": "eslint './{bin,lib}/**/*.ts' --fix",
-    "prebuild": "pnpm lint-fix"
+    "lint-fix": "eslint './{bin,lib}/**/*.ts' --fix"
   },
   "devDependencies": {
+    "@eslint/compat": "^1.2.4",
     "@stylistic/eslint-plugin": "^2.12.1",
     "@stylistic/eslint-plugin-js": "^2.12.1",
     "@stylistic/eslint-plugin-plus": "^2.12.1",
diff --git a/example/cdk/pnpm-lock.yaml b/example/cdk/pnpm-lock.yaml
index a43e1c45e..1a3196b9d 100644
--- a/example/cdk/pnpm-lock.yaml
+++ b/example/cdk/pnpm-lock.yaml
@@ -21,6 +21,9 @@ importers:
         specifier: ^0.5.21
         version: 0.5.21
     devDependencies:
+      '@eslint/compat':
+        specifier: ^1.2.4
+        version: 1.2.4(eslint@9.17.0)
       '@stylistic/eslint-plugin':
         specifier: ^2.12.1
         version: 2.12.1(eslint@9.17.0)(typescript@5.7.2)
@@ -242,6 +245,15 @@ packages:
     resolution: {integrity: sha512-CCZCDJuduB9OUkFkY2IgppNZMi2lBQgD2qzwXkEia16cge2pijY/aXi96CJMquDMn3nJdlPV1A5KrJEXwfLNzQ==}
     engines: {node: ^12.0.0 || ^14.0.0 || >=16.0.0}
 
+  '@eslint/compat@1.2.4':
+    resolution: {integrity: sha512-S8ZdQj/N69YAtuqFt7653jwcvuUj131+6qGLUyDqfDg1OIoBQ66OCuXC473YQfO2AaxITTutiRQiDwoo7ZLYyg==}
+    engines: {node: ^18.18.0 || ^20.9.0 || >=21.1.0}
+    peerDependencies:
+      eslint: ^9.10.0
+    peerDependenciesMeta:
+      eslint:
+        optional: true
+
   '@eslint/config-array@0.19.1':
     resolution: {integrity: sha512-fo6Mtm5mWyKjA/Chy1BYTdn5mGJoDNjC7C64ug20ADsRDGrA85bN3uK3MaKbeRkRuuIEAR5N33Jr1pbm411/PA==}
     engines: {node: ^18.18.0 || ^20.9.0 || >=21.1.0}
@@ -1422,6 +1434,10 @@ snapshots:
 
   '@eslint-community/regexpp@4.12.1': {}
 
+  '@eslint/compat@1.2.4(eslint@9.17.0)':
+    optionalDependencies:
+      eslint: 9.17.0
+
   '@eslint/config-array@0.19.1':
     dependencies:
       '@eslint/object-schema': 2.1.5
diff --git a/example/cdk/tsconfig.json b/example/cdk/tsconfig.json
index 1c489cc12..048f897b7 100644
--- a/example/cdk/tsconfig.json
+++ b/example/cdk/tsconfig.json
@@ -1,7 +1,7 @@
 {
   "compilerOptions": {
     "target": "esnext",
-    "module": "commonjs",
+    "module": "esnext",
     "lib": [
       "esnext"
     ],
@@ -19,6 +19,7 @@
     "inlineSources": true,
     "experimentalDecorators": true,
     "strictPropertyInitialization": false,
+    "moduleResolution": "node",
     "typeRoots": [
       "./node_modules/@types"
     ]
diff --git a/package/.gitignore b/package/.gitignore
index b857f0bd4..ad7cd2dd7 100644
--- a/package/.gitignore
+++ b/package/.gitignore
@@ -8,3 +8,4 @@ yarn-error.log
 .cdk.staging
 cdk.out
 *.pem
+!eslint.config.js
diff --git a/package/cdk.json b/package/cdk.json
index 89c9b704b..84f3ee42f 100644
--- a/package/cdk.json
+++ b/package/cdk.json
@@ -1,5 +1,5 @@
 {
-  "app": "test -e jwtRS256.private.pem || pnpm create-keypair --bits 4096 jwtRS256 && pnpm dlx ts-node --prefer-ts-exts bin/github-cognito-oidc-proxy.ts",
+  "app": "test -e jwtRS256.private.pem || pnpm create-keypair --bits 4096 jwtRS256 && pnpm dlx tsx bin/github-cognito-oidc-proxy.ts",
   "watch": {
     "include": [
       "**"
diff --git a/package/eslint.config.mjs b/package/eslint.config.js
similarity index 67%
rename from package/eslint.config.mjs
rename to package/eslint.config.js
index c2d1ecb55..ffc5b01e2 100644
--- a/package/eslint.config.mjs
+++ b/package/eslint.config.js
@@ -1,25 +1,29 @@
 // @ts-check
 
-import eslint from '@eslint/js';
-
+import { includeIgnoreFile } from '@eslint/compat';
 import stylistic from '@stylistic/eslint-plugin';
 import stylisticTs from '@stylistic/eslint-plugin-ts';
 import tseslint from 'typescript-eslint';
 // @ts-expect-error ignore type error
 import importPlugin from 'eslint-plugin-import';
 
+import path from "node:path";
+import { fileURLToPath } from "node:url";
+
+const __filename = fileURLToPath(import.meta.url);
+const __dirname = path.dirname(__filename);
+const gitignorePath = path.resolve(__dirname, "./.gitignore");
+
 export default tseslint.config(
-  eslint.configs.recommended,
+  includeIgnoreFile(gitignorePath),
+  {
+    files: [
+      './{bin,lib,lambda}/**/*.ts',
+    ],
+  },
   ...tseslint.configs.strict,
   ...tseslint.configs.stylistic,
   {
-    files: ['{bin,lib}/*.ts'],
-    ignores: [
-      '*.d.ts',
-      'node_modules/**/*',
-      'out',
-      'cdk.out',
-    ],
     ...importPlugin.flatConfigs.recommended,
     ...importPlugin.flatConfigs.typescript,
     settings: {
diff --git a/package/package.json b/package/package.json
index baa669b3d..36c4990e3 100644
--- a/package/package.json
+++ b/package/package.json
@@ -1,6 +1,7 @@
 {
   "name": "@github-cognito-oidc-proxy/package",
   "version": "0.1.0",
+  "type": "module",
   "bin": {
     "github-cognito-oidc-proxy": "bin/github-cognito-oidc-proxy.js"
   },
@@ -9,13 +10,11 @@
     "clean": "tsc --build --clean",
     "watch": "tsc -w",
     "cdk": "cdk",
-    "lint": "eslint './{lambda,bin,lib}/**/*.ts'",
-    "lint-fix": "eslint './{lambda,bin,lib}/**/*.ts' --fix",
-    "prebuild": "pnpm lint-fix",
-    "prelint": "pnpm clean",
-    "prelint-fix": "pnpm clean"
+    "lint": "eslint",
+    "lint-fix": "eslint --fix"
   },
   "devDependencies": {
+    "@eslint/compat": "^1.2.4",
     "@middy/core": "^6.0.0",
     "@stylistic/eslint-plugin": "^2.12.1",
     "@stylistic/eslint-plugin-js": "^2.12.1",
diff --git a/package/pnpm-lock.yaml b/package/pnpm-lock.yaml
index a02973424..9b7b5b566 100644
--- a/package/pnpm-lock.yaml
+++ b/package/pnpm-lock.yaml
@@ -36,6 +36,9 @@ importers:
         specifier: ^0.5.21
         version: 0.5.21
     devDependencies:
+      '@eslint/compat':
+        specifier: ^1.2.4
+        version: 1.2.4(eslint@9.17.0)
       '@middy/core':
         specifier: ^6.0.0
         version: 6.0.0
@@ -277,6 +280,15 @@ packages:
     resolution: {integrity: sha512-CCZCDJuduB9OUkFkY2IgppNZMi2lBQgD2qzwXkEia16cge2pijY/aXi96CJMquDMn3nJdlPV1A5KrJEXwfLNzQ==}
     engines: {node: ^12.0.0 || ^14.0.0 || >=16.0.0}
 
+  '@eslint/compat@1.2.4':
+    resolution: {integrity: sha512-S8ZdQj/N69YAtuqFt7653jwcvuUj131+6qGLUyDqfDg1OIoBQ66OCuXC473YQfO2AaxITTutiRQiDwoo7ZLYyg==}
+    engines: {node: ^18.18.0 || ^20.9.0 || >=21.1.0}
+    peerDependencies:
+      eslint: ^9.10.0
+    peerDependenciesMeta:
+      eslint:
+        optional: true
+
   '@eslint/config-array@0.19.1':
     resolution: {integrity: sha512-fo6Mtm5mWyKjA/Chy1BYTdn5mGJoDNjC7C64ug20ADsRDGrA85bN3uK3MaKbeRkRuuIEAR5N33Jr1pbm411/PA==}
     engines: {node: ^18.18.0 || ^20.9.0 || >=21.1.0}
@@ -1574,6 +1586,10 @@ snapshots:
 
   '@eslint-community/regexpp@4.12.1': {}
 
+  '@eslint/compat@1.2.4(eslint@9.17.0)':
+    optionalDependencies:
+      eslint: 9.17.0
+
   '@eslint/config-array@0.19.1':
     dependencies:
       '@eslint/object-schema': 2.1.5
diff --git a/package/tsconfig.json b/package/tsconfig.json
index f2a504414..c24a24898 100644
--- a/package/tsconfig.json
+++ b/package/tsconfig.json
@@ -1,9 +1,9 @@
 {
   "compilerOptions": {
-    "target": "ES2022",
-    "module": "commonjs",
+    "target": "esnext",
+    "module": "esnext",
     "lib": [
-      "es2022",
+      "esnext",
       "dom"
     ],
     "declaration": true,
@@ -20,6 +20,7 @@
     "inlineSources": true,
     "experimentalDecorators": true,
     "strictPropertyInitialization": false,
+    "moduleResolution": "node",
     "typeRoots": [
       "./node_modules/@types",
       "../node_modules/@types"