diff --git a/package-lock.json b/package-lock.json
index 8522e6e..44f4733 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -10,6 +10,7 @@
       "license": "MIT",
       "dependencies": {
         "@types/eslint": "^9.6.1",
+        "flatted": "^3.3.3",
         "jest-worker": "^29.7.0",
         "micromatch": "^4.0.8",
         "normalize-path": "^3.0.0",
@@ -7417,10 +7418,10 @@
       }
     },
     "node_modules/flatted": {
-      "version": "3.3.2",
-      "resolved": "https://registry.npmjs.org/flatted/-/flatted-3.3.2.tgz",
-      "integrity": "sha512-AiwGJM8YcNOaobumgtng+6NHuOqC3A7MixFeDafM3X9cIUM+xUXoS5Vfgf+OihAYe20fxqNM9yPBXJzRtZ/4eA==",
-      "dev": true
+      "version": "3.3.3",
+      "resolved": "https://registry.npmjs.org/flatted/-/flatted-3.3.3.tgz",
+      "integrity": "sha512-GX+ysw4PBCz0PzosHDepZGANEuFCMLrnRTiEy9McGjmkCQYwRq4A/X786G/fjM/+OjsWSU1ZrY5qyARZmO/uwg==",
+      "license": "ISC"
     },
     "node_modules/for-each": {
       "version": "0.3.3",
@@ -18959,10 +18960,9 @@
       }
     },
     "flatted": {
-      "version": "3.3.2",
-      "resolved": "https://registry.npmjs.org/flatted/-/flatted-3.3.2.tgz",
-      "integrity": "sha512-AiwGJM8YcNOaobumgtng+6NHuOqC3A7MixFeDafM3X9cIUM+xUXoS5Vfgf+OihAYe20fxqNM9yPBXJzRtZ/4eA==",
-      "dev": true
+      "version": "3.3.3",
+      "resolved": "https://registry.npmjs.org/flatted/-/flatted-3.3.3.tgz",
+      "integrity": "sha512-GX+ysw4PBCz0PzosHDepZGANEuFCMLrnRTiEy9McGjmkCQYwRq4A/X786G/fjM/+OjsWSU1ZrY5qyARZmO/uwg=="
     },
     "for-each": {
       "version": "0.3.3",
diff --git a/package.json b/package.json
index 24d05af..6d08ee7 100644
--- a/package.json
+++ b/package.json
@@ -51,6 +51,7 @@
   },
   "dependencies": {
     "@types/eslint": "^9.6.1",
+    "flatted": "^3.3.3",
     "jest-worker": "^29.7.0",
     "micromatch": "^4.0.8",
     "normalize-path": "^3.0.0",
diff --git a/src/getESLint.js b/src/getESLint.js
index c55915d..6c852ff 100644
--- a/src/getESLint.js
+++ b/src/getESLint.js
@@ -6,6 +6,7 @@ const { Worker: JestWorker } = require('jest-worker');
 const { setup, lintFiles } = require('./worker');
 const { getESLintOptions } = require('./options');
 const { jsonStringifyReplacerSortKeys } = require('./utils');
+const { stringify } = require('flatted');
 
 /** @type {{[key: string]: any}} */
 const cache = {};
@@ -115,7 +116,7 @@ async function getESLint(key, { threads, ...options }) {
  * @returns {string}
  */
 function getCacheKey(key, options) {
-  return JSON.stringify({ key, options }, jsonStringifyReplacerSortKeys);
+  return stringify({ key, options }, jsonStringifyReplacerSortKeys);
 }
 
 module.exports = {
diff --git a/src/utils.js b/src/utils.js
index b9ebc36..13aa67e 100644
--- a/src/utils.js
+++ b/src/utils.js
@@ -104,9 +104,13 @@ const jsonStringifyReplacerSortKeys = (_, value) => {
     return sorted;
   };
 
-  return value instanceof Object && !(value instanceof Array)
-    ? Object.keys(value).sort().reduce(insert, {})
-    : value;
+  if (value instanceof Object && !(value instanceof Array)) {
+    let sorted = Object.keys(value).sort().reduce(insert, {});
+    Object.keys(value).forEach((key) => delete value[key]);
+    Object.assign(value, sorted);
+  }
+
+  return value;
 };
 
 module.exports = {
diff --git a/test/circular-plugin.test.js b/test/circular-plugin.test.js
new file mode 100644
index 0000000..54b93ad
--- /dev/null
+++ b/test/circular-plugin.test.js
@@ -0,0 +1,38 @@
+import pack from './utils/pack';
+import { ESLint } from 'eslint';
+
+(ESLint && parseFloat(ESLint.version) < 9 ? describe.skip : describe)(
+  'circular plugin',
+  () => {
+    it('should support plugins with circular configs', async () => {
+      const plugin = {
+        configs: {},
+        rules: {},
+        processors: {},
+      };
+
+      Object.assign(plugin.configs, {
+        recommended: {
+          plugins: {
+            self: plugin,
+          },
+          rules: {},
+        },
+      });
+
+      const loaderOptions = {
+        configType: 'flat',
+        overrideConfig: {
+          plugins: { plugin: plugin },
+        },
+        overrideConfigFile: true,
+      };
+
+      const compiler = pack('good', loaderOptions);
+
+      const stats = await compiler.runAsync();
+      expect(stats.hasWarnings()).toBe(false);
+      expect(stats.hasErrors()).toBe(false);
+    });
+  },
+);