diff --git a/wp-admin/includes/update-core.php b/wp-admin/includes/update-core.php
index fd0032601f..9b6ece8d21 100644
--- a/wp-admin/includes/update-core.php
+++ b/wp-admin/includes/update-core.php
@@ -765,6 +765,11 @@ $_old_files = array(
 	'wp-admin/images/about-header-freedoms.svg',
 	'wp-admin/images/about-header-contribute.svg',
 	'wp-admin/images/about-header-background.svg',
+	// 6.6
+	'wp-includes/blocks/block/editor.css',
+	'wp-includes/blocks/block/editor.min.css',
+	'wp-includes/blocks/block/editor-rtl.css',
+	'wp-includes/blocks/block/editor-rtl.min.css',
 );
 
 /**
diff --git a/wp-includes/version.php b/wp-includes/version.php
index f3a4c478b0..5bc793f80b 100644
--- a/wp-includes/version.php
+++ b/wp-includes/version.php
@@ -16,7 +16,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '6.6.1-alpha-58737';
+$wp_version = '6.6.1-alpha-58746';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.