diff --git a/wp-admin/includes/update-core.php b/wp-admin/includes/update-core.php
index b04840c43a..c640332c29 100644
--- a/wp-admin/includes/update-core.php
+++ b/wp-admin/includes/update-core.php
@@ -253,7 +253,8 @@ $_old_files = array(
 	'wp-includes/js/jquery/autocomplete.js',
 	'wp-includes/js/jquery/interface.js',
 	'wp-includes/js/scriptaculous/prototype.js',
-	'wp-includes/js/tinymce/wp-tinymce.js',
+	// Following file added back in 5.1 see #45645
+	//'wp-includes/js/tinymce/wp-tinymce.js',
 	// 3.1
 	'wp-admin/edit-attachment-rows.php',
 	'wp-admin/edit-link-categories.php',
@@ -781,6 +782,8 @@ $_old_files = array(
 	'wp-includes/js/mediaelement/renderers/twitch.min.js',
 	// 5.0
 	'wp-includes/js/codemirror/jshint.js',
+	// 5.1
+	'wp-includes/js/tinymce/wp-tinymce.js.gz',
 );
 
 /**
diff --git a/wp-includes/version.php b/wp-includes/version.php
index 274c7c8d21..c17ea7e9ff 100644
--- a/wp-includes/version.php
+++ b/wp-includes/version.php
@@ -13,7 +13,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '5.1-beta1-44653';
+$wp_version = '5.1-beta1-44654';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.