diff --git a/wp-includes/class-wp-customize-manager.php b/wp-includes/class-wp-customize-manager.php
index 296e8af9be..d4e53911c4 100644
--- a/wp-includes/class-wp-customize-manager.php
+++ b/wp-includes/class-wp-customize-manager.php
@@ -232,7 +232,7 @@ final class WP_Customize_Manager {
 	 * Changeset data loaded from a customize_changeset post.
 	 *
 	 * @since 4.7.0
-	 * @var array
+	 * @var array|null
 	 */
 	private $_changeset_data;
 
diff --git a/wp-includes/version.php b/wp-includes/version.php
index 15cab9fd8e..8e23892bce 100644
--- a/wp-includes/version.php
+++ b/wp-includes/version.php
@@ -13,7 +13,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '5.3-alpha-45425';
+$wp_version = '5.3-alpha-45426';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.