diff --git a/.eslintrc.json b/.eslintrc.json
deleted file mode 100644
index 8541c83..0000000
--- a/.eslintrc.json
+++ /dev/null
@@ -1,14 +0,0 @@
-{
-    "env": {
-        "commonjs": true,
-        "es6": true,
-        "node": true
-    },
-    "extends": "eslint:recommended",
-    "parserOptions": {
-        "ecmaVersion": 2018
-    },
-    "ignorePatterns": [
-        "!node_modules/cylc-action-utils.js"
-    ]
-}
diff --git a/eslint.config.cjs b/eslint.config.cjs
new file mode 100644
index 0000000..ce8e6aa
--- /dev/null
+++ b/eslint.config.cjs
@@ -0,0 +1,13 @@
+const globals = require("globals")
+const js = require("@eslint/js")
+
+/** @type {import('eslint').Linter.FlatConfig[]} */
+module.exports = [
+    js.configs.recommended,
+    {
+        languageOptions: {
+            sourceType: "commonjs",
+            globals: globals.node,
+        },
+    },
+]
diff --git a/package-lock.json b/package-lock.json
index 45ac014..4683c17 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -5,7 +5,9 @@
     "packages": {
         "": {
             "devDependencies": {
-                "eslint": "^9.0.0"
+                "@eslint/js": "^9.0.0",
+                "eslint": "^9.0.0",
+                "globals": "^15.0.0"
             }
         },
         "node_modules/@aashutoshrathi/word-wrap": {
@@ -64,6 +66,18 @@
                 "url": "https://opencollective.com/eslint"
             }
         },
+        "node_modules/@eslint/eslintrc/node_modules/globals": {
+            "version": "14.0.0",
+            "resolved": "https://registry.npmjs.org/globals/-/globals-14.0.0.tgz",
+            "integrity": "sha512-oahGvuMGQlPw/ivIYBjVSrWAfWLBeku5tpPE2fOPLi+WHffIWbuh2tCjhyQhTBPMf5E9jDEH4FOmTYgYwbKwtQ==",
+            "dev": true,
+            "engines": {
+                "node": ">=18"
+            },
+            "funding": {
+                "url": "https://github.com/sponsors/sindresorhus"
+            }
+        },
         "node_modules/@eslint/js": {
             "version": "9.0.0",
             "resolved": "https://registry.npmjs.org/@eslint/js/-/js-9.0.0.tgz",
@@ -571,9 +585,9 @@
             }
         },
         "node_modules/globals": {
-            "version": "14.0.0",
-            "resolved": "https://registry.npmjs.org/globals/-/globals-14.0.0.tgz",
-            "integrity": "sha512-oahGvuMGQlPw/ivIYBjVSrWAfWLBeku5tpPE2fOPLi+WHffIWbuh2tCjhyQhTBPMf5E9jDEH4FOmTYgYwbKwtQ==",
+            "version": "15.0.0",
+            "resolved": "https://registry.npmjs.org/globals/-/globals-15.0.0.tgz",
+            "integrity": "sha512-m/C/yR4mjO6pXDTm9/R/SpYTAIyaUB4EOzcaaMEl7mds7Mshct9GfejiJNQGjHHbdMPey13Kpu4TMbYi9ex1pw==",
             "dev": true,
             "engines": {
                 "node": ">=18"
@@ -1070,6 +1084,14 @@
                 "js-yaml": "^4.1.0",
                 "minimatch": "^3.1.2",
                 "strip-json-comments": "^3.1.1"
+            },
+            "dependencies": {
+                "globals": {
+                    "version": "14.0.0",
+                    "resolved": "https://registry.npmjs.org/globals/-/globals-14.0.0.tgz",
+                    "integrity": "sha512-oahGvuMGQlPw/ivIYBjVSrWAfWLBeku5tpPE2fOPLi+WHffIWbuh2tCjhyQhTBPMf5E9jDEH4FOmTYgYwbKwtQ==",
+                    "dev": true
+                }
             }
         },
         "@eslint/js": {
@@ -1445,9 +1467,9 @@
             }
         },
         "globals": {
-            "version": "14.0.0",
-            "resolved": "https://registry.npmjs.org/globals/-/globals-14.0.0.tgz",
-            "integrity": "sha512-oahGvuMGQlPw/ivIYBjVSrWAfWLBeku5tpPE2fOPLi+WHffIWbuh2tCjhyQhTBPMf5E9jDEH4FOmTYgYwbKwtQ==",
+            "version": "15.0.0",
+            "resolved": "https://registry.npmjs.org/globals/-/globals-15.0.0.tgz",
+            "integrity": "sha512-m/C/yR4mjO6pXDTm9/R/SpYTAIyaUB4EOzcaaMEl7mds7Mshct9GfejiJNQGjHHbdMPey13Kpu4TMbYi9ex1pw==",
             "dev": true
         },
         "graphemer": {
diff --git a/package.json b/package.json
index 3032272..6ecdfc5 100644
--- a/package.json
+++ b/package.json
@@ -8,6 +8,8 @@
         ".": "./cylc-action-utils.js"
     },
     "devDependencies": {
-        "eslint": "^9.0.0"
+        "@eslint/js": "^9.0.0",
+        "eslint": "^9.0.0",
+        "globals": "^15.0.0"
     }
 }