diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index 51902405..2db8a0f5 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -38,17 +38,6 @@ jobs:
       - run: npm install
       - run: npm run lint
 
-  eslint8:
-    runs-on: ubuntu-latest
-    steps:
-      - uses: actions/checkout@v4
-      - uses: actions/setup-node@v4
-        with:
-          node-version: "lts/*"
-      - run: npm install
-      - run: npm install --save-dev eslint@8
-      - run: npm test
-
   test-remote:
     name: eslint-remote-tester
     runs-on: ubuntu-latest
diff --git a/package.json b/package.json
index be4d50fc..627142d1 100644
--- a/package.json
+++ b/package.json
@@ -86,7 +86,7 @@
     "typescript": "^5.7.2"
   },
   "peerDependencies": {
-    "eslint": ">=8.23.0"
+    "eslint": ">=9.0.0"
   },
   "engines": {
     "node": "^18.18.0 || ^20.9.0 || >=21.1.0"
diff --git a/tests/lib/eslint-rule-tester.js b/tests/lib/eslint-rule-tester.js
deleted file mode 100644
index dd16a8e2..00000000
--- a/tests/lib/eslint-rule-tester.js
+++ /dev/null
@@ -1,15 +0,0 @@
-/**
- * @fileoverview Helpers for tests.
- * @author 唯然<weiran.zsd@outlook.com>
- */
-
-'use strict';
-
-const eslintVersion = require('eslint/package.json').version;
-const { RuleTester } = require('eslint');
-const { FlatRuleTester } = require('eslint/use-at-your-own-risk');
-
-// greater than or equal to ESLint v9
-exports.gteEslintV9 = +eslintVersion.split('.')[0] >= 9;
-
-exports.RuleTester = exports.gteEslintV9 ? RuleTester : FlatRuleTester;
diff --git a/tests/lib/rules/consistent-output.js b/tests/lib/rules/consistent-output.js
index 75ecabe8..ca135568 100644
--- a/tests/lib/rules/consistent-output.js
+++ b/tests/lib/rules/consistent-output.js
@@ -10,7 +10,7 @@
 // ------------------------------------------------------------------------------
 
 const rule = require('../../../lib/rules/consistent-output');
-const RuleTester = require('../eslint-rule-tester').RuleTester;
+const RuleTester = require('eslint').RuleTester;
 
 const ERROR = { messageId: 'missingOutput', type: 'ObjectExpression' };
 
diff --git a/tests/lib/rules/fixer-return.js b/tests/lib/rules/fixer-return.js
index 349a9bf4..3436bddc 100644
--- a/tests/lib/rules/fixer-return.js
+++ b/tests/lib/rules/fixer-return.js
@@ -10,7 +10,7 @@
 // ------------------------------------------------------------------------------
 
 const rule = require('../../../lib/rules/fixer-return');
-const RuleTester = require('../eslint-rule-tester').RuleTester;
+const RuleTester = require('eslint').RuleTester;
 
 // ------------------------------------------------------------------------------
 // Tests
diff --git a/tests/lib/rules/meta-property-ordering.js b/tests/lib/rules/meta-property-ordering.js
index 1d4dfec8..d6e2fb70 100644
--- a/tests/lib/rules/meta-property-ordering.js
+++ b/tests/lib/rules/meta-property-ordering.js
@@ -9,7 +9,7 @@
 // ------------------------------------------------------------------------------
 
 const rule = require('../../../lib/rules/meta-property-ordering');
-const RuleTester = require('../eslint-rule-tester').RuleTester;
+const RuleTester = require('eslint').RuleTester;
 
 // ------------------------------------------------------------------------------
 // Tests
diff --git a/tests/lib/rules/no-deprecated-context-methods.js b/tests/lib/rules/no-deprecated-context-methods.js
index 84770ccd..f185b4ce 100644
--- a/tests/lib/rules/no-deprecated-context-methods.js
+++ b/tests/lib/rules/no-deprecated-context-methods.js
@@ -10,7 +10,7 @@
 // ------------------------------------------------------------------------------
 
 const rule = require('../../../lib/rules/no-deprecated-context-methods');
-const RuleTester = require('../eslint-rule-tester').RuleTester;
+const RuleTester = require('eslint').RuleTester;
 
 // ------------------------------------------------------------------------------
 // Tests
diff --git a/tests/lib/rules/no-deprecated-report-api.js b/tests/lib/rules/no-deprecated-report-api.js
index 6483fbde..7a35146c 100644
--- a/tests/lib/rules/no-deprecated-report-api.js
+++ b/tests/lib/rules/no-deprecated-report-api.js
@@ -10,7 +10,7 @@
 // ------------------------------------------------------------------------------
 
 const rule = require('../../../lib/rules/no-deprecated-report-api');
-const RuleTester = require('../eslint-rule-tester').RuleTester;
+const RuleTester = require('eslint').RuleTester;
 
 // ------------------------------------------------------------------------------
 // Tests
diff --git a/tests/lib/rules/no-identical-tests.js b/tests/lib/rules/no-identical-tests.js
index 6f0e444e..afb642ff 100644
--- a/tests/lib/rules/no-identical-tests.js
+++ b/tests/lib/rules/no-identical-tests.js
@@ -10,7 +10,7 @@
 // ------------------------------------------------------------------------------
 
 const rule = require('../../../lib/rules/no-identical-tests');
-const RuleTester = require('../eslint-rule-tester').RuleTester;
+const RuleTester = require('eslint').RuleTester;
 
 const ERROR_OBJECT_TEST = { messageId: 'identical', type: 'ObjectExpression' };
 const ERROR_STRING_TEST = { messageId: 'identical', type: 'Literal' };
diff --git a/tests/lib/rules/no-meta-replaced-by.js b/tests/lib/rules/no-meta-replaced-by.js
index d72f41ac..b08f14c5 100644
--- a/tests/lib/rules/no-meta-replaced-by.js
+++ b/tests/lib/rules/no-meta-replaced-by.js
@@ -9,7 +9,7 @@
 // ------------------------------------------------------------------------------
 
 const rule = require('../../../lib/rules/no-meta-replaced-by');
-const RuleTester = require('../eslint-rule-tester').RuleTester;
+const RuleTester = require('eslint').RuleTester;
 
 // ------------------------------------------------------------------------------
 // Tests
diff --git a/tests/lib/rules/no-meta-schema-default.js b/tests/lib/rules/no-meta-schema-default.js
index 869f4971..e6432110 100644
--- a/tests/lib/rules/no-meta-schema-default.js
+++ b/tests/lib/rules/no-meta-schema-default.js
@@ -5,7 +5,7 @@
 // ------------------------------------------------------------------------------
 
 const rule = require('../../../lib/rules/no-meta-schema-default');
-const RuleTester = require('../eslint-rule-tester').RuleTester;
+const RuleTester = require('eslint').RuleTester;
 
 // ------------------------------------------------------------------------------
 // Tests
diff --git a/tests/lib/rules/no-missing-message-ids.js b/tests/lib/rules/no-missing-message-ids.js
index 78b9e600..ff207938 100644
--- a/tests/lib/rules/no-missing-message-ids.js
+++ b/tests/lib/rules/no-missing-message-ids.js
@@ -5,7 +5,7 @@
 // ------------------------------------------------------------------------------
 
 const rule = require('../../../lib/rules/no-missing-message-ids');
-const RuleTester = require('../eslint-rule-tester').RuleTester;
+const RuleTester = require('eslint').RuleTester;
 
 // ------------------------------------------------------------------------------
 // Tests
diff --git a/tests/lib/rules/no-missing-placeholders.js b/tests/lib/rules/no-missing-placeholders.js
index 43bb137b..1d883950 100644
--- a/tests/lib/rules/no-missing-placeholders.js
+++ b/tests/lib/rules/no-missing-placeholders.js
@@ -10,7 +10,7 @@
 // ------------------------------------------------------------------------------
 
 const rule = require('../../../lib/rules/no-missing-placeholders');
-const RuleTester = require('../eslint-rule-tester').RuleTester;
+const RuleTester = require('eslint').RuleTester;
 
 /**
  * Create an error for the given key
diff --git a/tests/lib/rules/no-only-tests.js b/tests/lib/rules/no-only-tests.js
index 0df7e600..16a67755 100644
--- a/tests/lib/rules/no-only-tests.js
+++ b/tests/lib/rules/no-only-tests.js
@@ -5,7 +5,7 @@
 // ------------------------------------------------------------------------------
 
 const rule = require('../../../lib/rules/no-only-tests');
-const RuleTester = require('../eslint-rule-tester').RuleTester;
+const RuleTester = require('eslint').RuleTester;
 
 // ------------------------------------------------------------------------------
 // Tests
diff --git a/tests/lib/rules/no-property-in-node.js b/tests/lib/rules/no-property-in-node.js
index 62181a3b..029405e3 100644
--- a/tests/lib/rules/no-property-in-node.js
+++ b/tests/lib/rules/no-property-in-node.js
@@ -1,6 +1,6 @@
 'use strict';
 
-const RuleTester = require('../eslint-rule-tester').RuleTester;
+const RuleTester = require('eslint').RuleTester;
 const path = require('path');
 const rule = require('../../../lib/rules/no-property-in-node');
 
diff --git a/tests/lib/rules/no-unused-message-ids.js b/tests/lib/rules/no-unused-message-ids.js
index 8f5f6fa8..39457df4 100644
--- a/tests/lib/rules/no-unused-message-ids.js
+++ b/tests/lib/rules/no-unused-message-ids.js
@@ -5,7 +5,7 @@
 // ------------------------------------------------------------------------------
 
 const rule = require('../../../lib/rules/no-unused-message-ids');
-const RuleTester = require('../eslint-rule-tester').RuleTester;
+const RuleTester = require('eslint').RuleTester;
 
 // ------------------------------------------------------------------------------
 // Tests
diff --git a/tests/lib/rules/no-unused-placeholders.js b/tests/lib/rules/no-unused-placeholders.js
index fd93b777..9e8d2a6b 100644
--- a/tests/lib/rules/no-unused-placeholders.js
+++ b/tests/lib/rules/no-unused-placeholders.js
@@ -10,7 +10,7 @@
 // ------------------------------------------------------------------------------
 
 const rule = require('../../../lib/rules/no-unused-placeholders');
-const RuleTester = require('../eslint-rule-tester').RuleTester;
+const RuleTester = require('eslint').RuleTester;
 
 /**
  * Create an error for the given key
diff --git a/tests/lib/rules/no-useless-token-range.js b/tests/lib/rules/no-useless-token-range.js
index c4b13960..5405b7a1 100644
--- a/tests/lib/rules/no-useless-token-range.js
+++ b/tests/lib/rules/no-useless-token-range.js
@@ -10,7 +10,7 @@
 // ------------------------------------------------------------------------------
 
 const rule = require('../../../lib/rules/no-useless-token-range');
-const RuleTester = require('../eslint-rule-tester').RuleTester;
+const RuleTester = require('eslint').RuleTester;
 
 /**
  * Wraps a code sample as an eslint rule
diff --git a/tests/lib/rules/prefer-message-ids.js b/tests/lib/rules/prefer-message-ids.js
index ac54184e..a2ea2af2 100644
--- a/tests/lib/rules/prefer-message-ids.js
+++ b/tests/lib/rules/prefer-message-ids.js
@@ -5,7 +5,7 @@
 // ------------------------------------------------------------------------------
 
 const rule = require('../../../lib/rules/prefer-message-ids');
-const RuleTester = require('../eslint-rule-tester').RuleTester;
+const RuleTester = require('eslint').RuleTester;
 
 // ------------------------------------------------------------------------------
 // Tests
diff --git a/tests/lib/rules/prefer-object-rule.js b/tests/lib/rules/prefer-object-rule.js
index 9c0aae74..d02ec2e4 100644
--- a/tests/lib/rules/prefer-object-rule.js
+++ b/tests/lib/rules/prefer-object-rule.js
@@ -9,7 +9,7 @@
 // ------------------------------------------------------------------------------
 
 const rule = require('../../../lib/rules/prefer-object-rule');
-const RuleTester = require('../eslint-rule-tester').RuleTester;
+const RuleTester = require('eslint').RuleTester;
 
 // ------------------------------------------------------------------------------
 // Tests
diff --git a/tests/lib/rules/prefer-output-null.js b/tests/lib/rules/prefer-output-null.js
index b7c0eda1..cbb8086c 100644
--- a/tests/lib/rules/prefer-output-null.js
+++ b/tests/lib/rules/prefer-output-null.js
@@ -10,7 +10,7 @@
 // ------------------------------------------------------------------------------
 
 const rule = require('../../../lib/rules/prefer-output-null');
-const RuleTester = require('../eslint-rule-tester').RuleTester;
+const RuleTester = require('eslint').RuleTester;
 
 const ERROR = { messageId: 'useOutputNull', type: 'Property' };
 
diff --git a/tests/lib/rules/prefer-placeholders.js b/tests/lib/rules/prefer-placeholders.js
index f7fe49e0..bd41797f 100644
--- a/tests/lib/rules/prefer-placeholders.js
+++ b/tests/lib/rules/prefer-placeholders.js
@@ -10,7 +10,7 @@
 // ------------------------------------------------------------------------------
 
 const rule = require('../../../lib/rules/prefer-placeholders');
-const RuleTester = require('../eslint-rule-tester').RuleTester;
+const RuleTester = require('eslint').RuleTester;
 
 // ------------------------------------------------------------------------------
 // Tests
diff --git a/tests/lib/rules/prefer-replace-text.js b/tests/lib/rules/prefer-replace-text.js
index c83a9559..aa5b7e4d 100644
--- a/tests/lib/rules/prefer-replace-text.js
+++ b/tests/lib/rules/prefer-replace-text.js
@@ -10,7 +10,7 @@
 // ------------------------------------------------------------------------------
 
 const rule = require('../../../lib/rules/prefer-replace-text');
-const RuleTester = require('../eslint-rule-tester').RuleTester;
+const RuleTester = require('eslint').RuleTester;
 
 // ------------------------------------------------------------------------------
 // Tests
diff --git a/tests/lib/rules/report-message-format.js b/tests/lib/rules/report-message-format.js
index 7ca4cf10..417882b9 100644
--- a/tests/lib/rules/report-message-format.js
+++ b/tests/lib/rules/report-message-format.js
@@ -10,7 +10,7 @@
 // ------------------------------------------------------------------------------
 
 const rule = require('../../../lib/rules/report-message-format');
-const RuleTester = require('../eslint-rule-tester').RuleTester;
+const RuleTester = require('eslint').RuleTester;
 
 // ------------------------------------------------------------------------------
 // Tests
diff --git a/tests/lib/rules/require-meta-default-options.js b/tests/lib/rules/require-meta-default-options.js
index da2b4209..50cb1616 100644
--- a/tests/lib/rules/require-meta-default-options.js
+++ b/tests/lib/rules/require-meta-default-options.js
@@ -1,7 +1,7 @@
 'use strict';
 
 const rule = require('../../../lib/rules/require-meta-default-options');
-const RuleTester = require('../eslint-rule-tester').RuleTester;
+const RuleTester = require('eslint').RuleTester;
 
 const ruleTester = new RuleTester({
   languageOptions: { sourceType: 'commonjs' },
diff --git a/tests/lib/rules/require-meta-docs-description.js b/tests/lib/rules/require-meta-docs-description.js
index 2b4ded37..f76bb293 100644
--- a/tests/lib/rules/require-meta-docs-description.js
+++ b/tests/lib/rules/require-meta-docs-description.js
@@ -5,7 +5,7 @@
 // ------------------------------------------------------------------------------
 
 const rule = require('../../../lib/rules/require-meta-docs-description');
-const RuleTester = require('../eslint-rule-tester').RuleTester;
+const RuleTester = require('eslint').RuleTester;
 
 // ------------------------------------------------------------------------------
 // Tests
diff --git a/tests/lib/rules/require-meta-docs-recommended.js b/tests/lib/rules/require-meta-docs-recommended.js
index 1a58bacc..6d626e85 100644
--- a/tests/lib/rules/require-meta-docs-recommended.js
+++ b/tests/lib/rules/require-meta-docs-recommended.js
@@ -1,7 +1,7 @@
 'use strict';
 
 const rule = require('../../../lib/rules/require-meta-docs-recommended');
-const RuleTester = require('../eslint-rule-tester').RuleTester;
+const RuleTester = require('eslint').RuleTester;
 
 const ruleTester = new RuleTester({
   languageOptions: { sourceType: 'commonjs' },
diff --git a/tests/lib/rules/require-meta-docs-url.js b/tests/lib/rules/require-meta-docs-url.js
index da7a9048..9c299d93 100644
--- a/tests/lib/rules/require-meta-docs-url.js
+++ b/tests/lib/rules/require-meta-docs-url.js
@@ -10,7 +10,7 @@
 // Requirements
 // -----------------------------------------------------------------------------
 
-const RuleTester = require('../eslint-rule-tester').RuleTester;
+const RuleTester = require('eslint').RuleTester;
 const rule = require('../../../lib/rules/require-meta-docs-url');
 
 // -----------------------------------------------------------------------------
diff --git a/tests/lib/rules/require-meta-fixable.js b/tests/lib/rules/require-meta-fixable.js
index 8aef6c04..c3bb18a8 100644
--- a/tests/lib/rules/require-meta-fixable.js
+++ b/tests/lib/rules/require-meta-fixable.js
@@ -10,7 +10,7 @@
 // ------------------------------------------------------------------------------
 
 const rule = require('../../../lib/rules/require-meta-fixable');
-const RuleTester = require('../eslint-rule-tester').RuleTester;
+const RuleTester = require('eslint').RuleTester;
 
 // ------------------------------------------------------------------------------
 // Tests
diff --git a/tests/lib/rules/require-meta-has-suggestions.js b/tests/lib/rules/require-meta-has-suggestions.js
index 0a1e96ab..d459c681 100644
--- a/tests/lib/rules/require-meta-has-suggestions.js
+++ b/tests/lib/rules/require-meta-has-suggestions.js
@@ -5,7 +5,7 @@
 // ------------------------------------------------------------------------------
 
 const rule = require('../../../lib/rules/require-meta-has-suggestions');
-const RuleTester = require('../eslint-rule-tester').RuleTester;
+const RuleTester = require('eslint').RuleTester;
 
 // ------------------------------------------------------------------------------
 // Tests
diff --git a/tests/lib/rules/require-meta-schema-description.js b/tests/lib/rules/require-meta-schema-description.js
index 1b3f4256..5aabc5ec 100644
--- a/tests/lib/rules/require-meta-schema-description.js
+++ b/tests/lib/rules/require-meta-schema-description.js
@@ -5,7 +5,7 @@
 // ------------------------------------------------------------------------------
 
 const rule = require('../../../lib/rules/require-meta-schema-description');
-const RuleTester = require('../eslint-rule-tester').RuleTester;
+const RuleTester = require('eslint').RuleTester;
 
 // ------------------------------------------------------------------------------
 // Tests
diff --git a/tests/lib/rules/require-meta-schema.js b/tests/lib/rules/require-meta-schema.js
index dfb1754d..11e48c13 100644
--- a/tests/lib/rules/require-meta-schema.js
+++ b/tests/lib/rules/require-meta-schema.js
@@ -5,7 +5,7 @@
 // ------------------------------------------------------------------------------
 
 const rule = require('../../../lib/rules/require-meta-schema');
-const RuleTester = require('../eslint-rule-tester').RuleTester;
+const RuleTester = require('eslint').RuleTester;
 
 // ------------------------------------------------------------------------------
 // Tests
diff --git a/tests/lib/rules/require-meta-type.js b/tests/lib/rules/require-meta-type.js
index 2180e23e..6a222331 100644
--- a/tests/lib/rules/require-meta-type.js
+++ b/tests/lib/rules/require-meta-type.js
@@ -10,7 +10,7 @@
 // ------------------------------------------------------------------------------
 
 const rule = require('../../../lib/rules/require-meta-type');
-const RuleTester = require('../eslint-rule-tester').RuleTester;
+const RuleTester = require('eslint').RuleTester;
 
 // ------------------------------------------------------------------------------
 // Tests
diff --git a/tests/lib/rules/test-case-property-ordering.js b/tests/lib/rules/test-case-property-ordering.js
index 149278d1..f4532975 100644
--- a/tests/lib/rules/test-case-property-ordering.js
+++ b/tests/lib/rules/test-case-property-ordering.js
@@ -10,7 +10,7 @@
 // ------------------------------------------------------------------------------
 
 const rule = require('../../../lib/rules/test-case-property-ordering');
-const RuleTester = require('../eslint-rule-tester').RuleTester;
+const RuleTester = require('eslint').RuleTester;
 
 // ------------------------------------------------------------------------------
 // Tests
diff --git a/tests/lib/rules/test-case-shorthand-strings.js b/tests/lib/rules/test-case-shorthand-strings.js
index 4deddade..9708b510 100644
--- a/tests/lib/rules/test-case-shorthand-strings.js
+++ b/tests/lib/rules/test-case-shorthand-strings.js
@@ -10,7 +10,7 @@
 // ------------------------------------------------------------------------------
 
 const rule = require('../../../lib/rules/test-case-shorthand-strings');
-const RuleTester = require('../eslint-rule-tester').RuleTester;
+const RuleTester = require('eslint').RuleTester;
 
 /**
  * Returns the code for some valid test cases