diff --git a/wp-includes/class-wp-theme-json.php b/wp-includes/class-wp-theme-json.php
index eef97157554..2fcf39a20a3 100644
--- a/wp-includes/class-wp-theme-json.php
+++ b/wp-includes/class-wp-theme-json.php
@@ -313,10 +313,12 @@ class WP_Theme_JSON {
 	 * @since 5.8.0 As `ALLOWED_TOP_LEVEL_KEYS`.
 	 * @since 5.9.0 Renamed from `ALLOWED_TOP_LEVEL_KEYS` to `VALID_TOP_LEVEL_KEYS`,
 	 *              added the `customTemplates` and `templateParts` values.
+	 * @since 6.3.0 Added the `description` value.
 	 * @var string[]
 	 */
 	const VALID_TOP_LEVEL_KEYS = array(
 		'customTemplates',
+		'description',
 		'patterns',
 		'settings',
 		'styles',
diff --git a/wp-includes/version.php b/wp-includes/version.php
index db419489586..249586fc104 100644
--- a/wp-includes/version.php
+++ b/wp-includes/version.php
@@ -16,7 +16,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '6.3-alpha-56040';
+$wp_version = '6.3-alpha-56041';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.