diff --git wp-includes/class-wp-customize-setting.php wp-includes/class-wp-customize-setting.php
index 7a7be45..3574486 100644
--- wp-includes/class-wp-customize-setting.php
+++ wp-includes/class-wp-customize-setting.php
@@ -240,7 +240,7 @@ class WP_Customize_Setting {
 	 * @param mixed $value The value to update.
 	 * @return mixed The result of saving the value.
 	 */
-	protected function update( $value ) {
+	public function update( $value ) {
 		switch( $this->type ) {
 			case 'theme_mod' :
 				return $this->_update_theme_mod( $value );