diff --git a/playground/eslint.config.mjs b/playground/eslint.config.mjs
index 39178b9aa..05a5d5dad 100644
--- a/playground/eslint.config.mjs
+++ b/playground/eslint.config.mjs
@@ -8,7 +8,7 @@ export default ts.config(
     eslint.configs.recommended,
     ...ts.configs.recommendedTypeChecked,
     {
-        files: ['index.ts', 'test.ts', 'lib.d.ts'],
+        files: ['*.ts'],
         languageOptions: {
             parserOptions: {
                 project: 'tsconfig.json',
@@ -41,7 +41,7 @@ export default ts.config(
         },
     },
     {
-        files: ['eslint.config.mjs', 'eslint.d.ts'],
+        files: ['eslint.config.mjs'],
         languageOptions: {
             parserOptions: {
                 project: 'tsconfig.eslint.json',
diff --git a/playground/eslint.d.ts b/playground/eslint.d.ts
deleted file mode 100644
index 4957c0fb3..000000000
--- a/playground/eslint.d.ts
+++ /dev/null
@@ -1,17 +0,0 @@
-declare module 'eslint-plugin-mocha' {
-    import type { ESLint, Linter } from 'eslint';
-
-    interface Configs {
-        configs: {
-            recommended: Linter.Config;
-            all: Linter.Config;
-            flat: {
-                recommended: Linter.FlatConfig;
-                all: Linter.FlatConfig;
-            };
-        };
-    }
-
-    const plugin: Configs & ESLint.Plugin;
-    export default plugin;
-}
diff --git a/playground/package.json b/playground/package.json
index 04f416220..271a4aedd 100644
--- a/playground/package.json
+++ b/playground/package.json
@@ -33,8 +33,8 @@
   "devDependencies": {
     "@peculiar/webcrypto": "^1.4.5",
     "@types/codemirror": "^5.60.15",
-    "@types/eslint": "^8.56.5",
     "@types/eslint__js": "^8.42.3",
+    "@types/eslint-plugin-mocha": "^10.4.0",
     "@types/node": "^20.11.24",
     "@types/pako": "^2.0.3",
     "eslint": "^8.57.0",
diff --git a/playground/tsconfig.eslint.json b/playground/tsconfig.eslint.json
index 74c9a779e..a8cd64c8a 100644
--- a/playground/tsconfig.eslint.json
+++ b/playground/tsconfig.eslint.json
@@ -5,7 +5,6 @@
     "moduleResolution": "nodenext"
   },
   "files": [
-    "eslint.config.mjs",
-    "eslint.d.ts"
+    "eslint.config.mjs"
   ]
 }