diff --git a/CHANGELOG.md b/CHANGELOG.md
index d28374af5f..e70c0cc101 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -11,9 +11,13 @@ This change log adheres to standards from [Keep a CHANGELOG](https://keepachange
 * add [`sort-default-props`] and deprecate [`jsx-sort-default-props`] ([#1861][] @alexzherdev)
 * add [`no-object-type-as-default-prop`] rule ([#2848][] @cyan33 @fengkx)
 
+### Fixed
+* configs: avoid legacy config system error ([#3461][] @ljharb)
+
 ### Changed
 * [Perf] component detection: improve performance by avoiding traversing parents unnecessarily ([#3459][] @golopot)
 
+[#3461]: https://github.com/jsx-eslint/eslint-plugin-react/issues/3461
 [#3459]: https://github.com/jsx-eslint/eslint-plugin-react/pull/3459
 [#3449]: https://github.com/jsx-eslint/eslint-plugin-react/pull/3449
 [#3424]: https://github.com/jsx-eslint/eslint-plugin-react/pull/3429
diff --git a/configs/all.js b/configs/all.js
index e0134738df..302fbaf88e 100644
--- a/configs/all.js
+++ b/configs/all.js
@@ -123,3 +123,6 @@ module.exports = {
   },
   rules: allRules,
 };
+
+// this is so the `languageOptions` property won't be warned in the new config system
+Object.defineProperty(module.exports, 'languageOptions', { enumerable: false });
diff --git a/configs/jsx-runtime.js b/configs/jsx-runtime.js
index 3caf18965c..a6302be504 100644
--- a/configs/jsx-runtime.js
+++ b/configs/jsx-runtime.js
@@ -13,3 +13,6 @@ module.exports = Object.assign({}, all, {
     'react/jsx-uses-react': 0,
   },
 });
+
+// this is so the `languageOptions` property won't be warned in the new config system
+Object.defineProperty(module.exports, 'languageOptions', { enumerable: false });
diff --git a/configs/recommended.js b/configs/recommended.js
index 09189a2199..be146dd8be 100644
--- a/configs/recommended.js
+++ b/configs/recommended.js
@@ -28,3 +28,6 @@ module.exports = Object.assign({}, all, {
     'react/require-render-return': 2,
   },
 });
+
+// this is so the `languageOptions` property won't be warned in the new config system
+Object.defineProperty(module.exports, 'languageOptions', { enumerable: false });