diff --git a/wp-includes/html-api/class-wp-html-processor.php b/wp-includes/html-api/class-wp-html-processor.php
index ba03ff44d7..67bccab7b3 100644
--- a/wp-includes/html-api/class-wp-html-processor.php
+++ b/wp-includes/html-api/class-wp-html-processor.php
@@ -1304,10 +1304,11 @@ class WP_HTML_Processor extends WP_HTML_Tag_Processor {
 	 * @see static::serialize()
 	 *
 	 * @since 6.7.0
+	 * @since 6.9.0 Converted from protected to public method.
 	 *
 	 * @return string Serialization of token, or empty string if no serialization exists.
 	 */
-	protected function serialize_token(): string {
+	public function serialize_token(): string {
 		$html       = '';
 		$token_type = $this->get_token_type();
 
diff --git a/wp-includes/version.php b/wp-includes/version.php
index 6f1582113c..8efdd52843 100644
--- a/wp-includes/version.php
+++ b/wp-includes/version.php
@@ -16,7 +16,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '6.9-alpha-60632';
+$wp_version = '6.9-alpha-60633';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.