diff --git a/wp-includes/class-wp-block-type.php b/wp-includes/class-wp-block-type.php
index ba0b59b8ad..716faf010a 100644
--- a/wp-includes/class-wp-block-type.php
+++ b/wp-includes/class-wp-block-type.php
@@ -128,7 +128,7 @@ class WP_Block_Type {
 	 * Block type front end style handle.
 	 *
 	 * @since 5.0.0
-	 * @var string
+	 * @var string|null
 	 */
 	public $style = null;
 
diff --git a/wp-includes/version.php b/wp-includes/version.php
index dfa72a9464..cc749f776b 100644
--- a/wp-includes/version.php
+++ b/wp-includes/version.php
@@ -13,7 +13,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '5.5-alpha-47907';
+$wp_version = '5.5-alpha-47908';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.