diff --git a/dev/lib/syntax.js b/dev/lib/syntax.js
index 823e4f5..65ea8ee 100644
--- a/dev/lib/syntax.js
+++ b/dev/lib/syntax.js
@@ -13,7 +13,7 @@
  * @property {Acorn} acorn
  *   Acorn parser to use (required).
  * @property {AcornOptions | null | undefined} [acornOptions]
- *   Configuration for acorn (default: `{ecmaVersion: 2020, locations: true,
+ *   Configuration for acorn (default: `{ecmaVersion: 2024, locations: true,
  *   sourceType: 'module'}`); all fields except `locations` can be set.
  * @property {boolean | null | undefined} [addResult=false]
  *   Whether to add `estree` fields to tokens with results from acorn
@@ -57,8 +57,9 @@ export function mdxjsEsm(options) {
 
   const acorn = options.acorn
   const acornOptions = Object.assign(
-    {ecmaVersion: 2020, sourceType: 'module'},
-    options.acornOptions
+    {ecmaVersion: 2024, sourceType: 'module'},
+    options.acornOptions,
+    {locations: true}
   )
 
   return {
diff --git a/readme.md b/readme.md
index afa75b7..29b6ddf 100644
--- a/readme.md
+++ b/readme.md
@@ -139,7 +139,7 @@ Configuration (TypeScript type).
 *   `acorn` ([`Acorn`][acorn], required)
     — acorn parser to use
 *   `acornOptions` ([`AcornOptions`][acorn-options], default:
-    `{ecmaVersion: 2020, locations: true, sourceType: 'module'}`)
+    `{ecmaVersion: 2024, locations: true, sourceType: 'module'}`)
     — configuration for acorn; all fields except `locations` can be set
 *   `addResult` (`boolean`, default: `false`)
     — whether to add `estree` fields to tokens with results from acorn