diff --git a/.github/workflows/tests.yaml b/.github/workflows/tests.yaml
index a053ffb..ff7cbbc 100644
--- a/.github/workflows/tests.yaml
+++ b/.github/workflows/tests.yaml
@@ -35,10 +35,18 @@ jobs:
         eslint-version:
           - 7
           - 8
+          - 9
         node-version:
           - 14
           - 16
           - 18
+          - 20
+      exclude:
+        # eslint@9 requires node 18+
+        - eslint-version: 9
+          node-version: 14
+        - eslint-version: 9
+          node-version: 16
 
     steps:
     - uses: actions/checkout@v4
diff --git a/lib/ignore-all.js b/lib/ignore-all.js
index 9138114..6ce1a1d 100644
--- a/lib/ignore-all.js
+++ b/lib/ignore-all.js
@@ -52,11 +52,16 @@ module.exports = async function ignoreAll(cwd = process.cwd()) {
 
   const eslint = importCwd('eslint');
 
-  if (semver.intersects(eslintVersion, '8')) {
+  if (
+    semver.intersects(eslintVersion, '8') ||
+    semver.intersects(eslintVersion, '9')
+  ) {
     // this won't use the version in the repo but it will still use v8 because
     // that is installed in this repo
     const { ESLint } = eslint;
-    cli = new ESLint();
+    cli = new ESLint({
+      cwd,
+    });
     results = await cli.lintFiles([cwd]);
 
     // remove warnings
diff --git a/package.json b/package.json
index 525e6b0..e580bfa 100644
--- a/package.json
+++ b/package.json
@@ -16,6 +16,7 @@
   "devDependencies": {
     "@babel/core": "^7.25.2",
     "@babel/eslint-parser": "^7.19.1",
+    "@eslint/js": "^9.13.0",
     "chai": "^4.3.4",
     "eslint": "^8.0.0",
     "eslint-config-prettier": "^9.1.0",
diff --git a/pnpm-lock.yaml b/pnpm-lock.yaml
index dc4c04d..e408433 100644
--- a/pnpm-lock.yaml
+++ b/pnpm-lock.yaml
@@ -8,6 +8,7 @@ patchedDependencies:
 specifiers:
   '@babel/core': ^7.25.2
   '@babel/eslint-parser': ^7.19.1
+  '@eslint/js': ^9.13.0
   chai: ^4.3.4
   eslint: ^8.0.0
   eslint-config-prettier: ^9.1.0
@@ -34,6 +35,7 @@ dependencies:
 devDependencies:
   '@babel/core': 7.25.2
   '@babel/eslint-parser': 7.25.1_uhszjnyxpp3ff7nctzrrdj6llq
+  '@eslint/js': 9.13.0
   chai: 4.5.0
   eslint: 8.57.1
   eslint-config-prettier: 9.1.0_eslint@8.57.1
@@ -294,6 +296,11 @@ packages:
     engines: {node: ^12.22.0 || ^14.17.0 || >=16.0.0}
     dev: true
 
+  /@eslint/js/9.13.0:
+    resolution: {integrity: sha512-IFLyoY4d72Z5y/6o/BazFBezupzI/taV8sGumxTAVw3lXG9A6md1Dc34T9s1FoD/an9pJH8RHbAxsaEbBed9lA==}
+    engines: {node: ^18.18.0 || ^20.9.0 || >=21.1.0}
+    dev: true
+
   /@gar/promisify/1.1.3:
     resolution: {integrity: sha512-k2Ty1JcVojjJFwrg/ThKi2ujJ7XNLYaFGNB/bWT9wGR+oSMJHMa5w+CUq6p/pVrKeNNgA7pCqEcjSnHVoqJQFw==}
     dev: true
@@ -1075,16 +1082,16 @@ packages:
       isexe: 2.0.0
     dev: true
 
-  /acorn-jsx/5.3.2_acorn@8.12.1:
+  /acorn-jsx/5.3.2_acorn@8.14.0:
     resolution: {integrity: sha512-rq9s+JNhf0IChjtDXxllJ7g41oZk5SlXtp0LHwyA5cejwn7vKmKp4pPri6YEePv2PU65sAsegbXtIinmDFDXgQ==}
     peerDependencies:
       acorn: ^6.0.0 || ^7.0.0 || ^8.0.0
     dependencies:
-      acorn: 8.12.1
+      acorn: 8.14.0
     dev: true
 
-  /acorn/8.12.1:
-    resolution: {integrity: sha512-tcpGyI9zbizT9JbV6oYE477V6mTlXvvi0T0G3SNIYE2apm/G5huBa1+K89VGeovbg+jycCrfhl3ADxErOuO6Jg==}
+  /acorn/8.14.0:
+    resolution: {integrity: sha512-cl669nCJTZBsL97OF4kUQm5g5hC2uihk0NxY3WENAC0TYdILVkAyHymAntgxGkl7K+t0cXIrH5siy5S4XkFycA==}
     engines: {node: '>=0.4.0'}
     hasBin: true
     dev: true
@@ -2083,6 +2090,7 @@ packages:
   /eslint/8.57.1:
     resolution: {integrity: sha512-ypowyDxpVSYpkXr9WPv2PAZCtNip1Mv5KTW0SCurXv/9iOpcrH9PaqUElksqEB6pChqHGDRCFTyrZlGhnLNGiA==}
     engines: {node: ^12.22.0 || ^14.17.0 || >=16.0.0}
+    deprecated: This version is no longer supported. Please see https://eslint.org/version-support for other options.
     hasBin: true
     dependencies:
       '@eslint-community/eslint-utils': 4.4.0_eslint@8.57.1
@@ -2131,8 +2139,8 @@ packages:
     resolution: {integrity: sha512-oruZaFkjorTpF32kDSI5/75ViwGeZginGGy2NoOSg3Q9bnwlnmDm4HLnkl0RE3n+njDXR037aY1+x58Z/zFdwQ==}
     engines: {node: ^12.22.0 || ^14.17.0 || >=16.0.0}
     dependencies:
-      acorn: 8.12.1
-      acorn-jsx: 5.3.2_acorn@8.12.1
+      acorn: 8.14.0
+      acorn-jsx: 5.3.2_acorn@8.14.0
       eslint-visitor-keys: 3.4.3
     dev: true
 
@@ -4877,7 +4885,7 @@ packages:
     resolution: {directory: '', type: directory}
     id: 'file:'
     name: lint-to-the-future-eslint
-    version: 2.0.1
+    version: 2.1.3
     engines: {node: 10.* || >= 12.*}
     peerDependencies:
       eslint: ^6.0.0 || ^7.0.0 || ^8.0.0
diff --git a/test/ignore.mjs b/test/ignore.mjs
index 1a01fa6..4783961 100644
--- a/test/ignore.mjs
+++ b/test/ignore.mjs
@@ -9,6 +9,12 @@ async function ignoreTestFile(input, files) {
   const project = new Project({
     files: {
       '.eslintrc.json': '{"extends": "eslint:recommended"}',
+      //only for eslint 9
+      'eslint.config.js': `const js = require("@eslint/js");
+
+module.exports = [
+    js.configs.recommended,
+];`,
       'index.js': input,
       'package.json': `{
         "devDependencies": {
@@ -20,6 +26,7 @@ async function ignoreTestFile(input, files) {
   });
 
   project.linkDevDependency('eslint', { baseDir: process.cwd() });
+  project.linkDevDependency('@eslint/js', { baseDir: process.cwd() });
   await project.write();
   await ignoreAll(project.baseDir);
 
@@ -82,6 +89,13 @@ if (10 === 'false') {
         {
           '.eslintrc.json':
             '{"extends": "eslint:recommended", "rules": { "no-constant-condition": "warn" }}',
+          //only for eslint 9
+          'eslint.config.js': `const js = require("@eslint/js");
+
+          module.exports = [
+              js.configs.recommended,
+              { rules: { "no-constant-condition": "warn" }}
+          ];`,
         },
       ),
     ).to.equal(`/* eslint-disable no-debugger */