Index: wp-admin/includes/update-core.php
===================================================================
--- wp-admin/includes/update-core.php	(revision 23465)
+++ wp-admin/includes/update-core.php	(working copy)
@@ -571,10 +571,11 @@
 global $_new_bundled_files;
 
 $_new_bundled_files = array(
-'plugins/akismet/' => '2.0',
-'themes/twentyten/' => '3.0',
-'themes/twentyeleven/' => '3.2',
-'themes/twentytwelve/' => '3.5',
+	'plugins/akismet/'       => '2.0',
+	'themes/twentyten/'      => '3.0',
+	'themes/twentyeleven/'   => '3.2',
+	'themes/twentytwelve/'   => '3.5',
+	'themes/twentythirteen/' => '3.6',
 );
 
 /**
Index: wp-admin/includes/upgrade.php
===================================================================
--- wp-admin/includes/upgrade.php	(revision 23465)
+++ wp-admin/includes/upgrade.php	(working copy)
@@ -218,7 +218,7 @@
 	update_option( 'widget_archives', array ( 2 => array ( 'title' => '', 'count' => 0, 'dropdown' => 0 ), '_multiwidget' => 1 ) );
 	update_option( 'widget_categories', array ( 2 => array ( 'title' => '', 'count' => 0, 'hierarchical' => 0, 'dropdown' => 0 ), '_multiwidget' => 1 ) );
 	update_option( 'widget_meta', array ( 2 => array ( 'title' => '' ), '_multiwidget' => 1 ) );
-	update_option( 'sidebars_widgets', array ( 'wp_inactive_widgets' => array (), 'sidebar-1' => array ( 0 => 'search-2', 1 => 'recent-posts-2', 2 => 'recent-comments-2', 3 => 'archives-2', 4 => 'categories-2', 5 => 'meta-2', ), 'sidebar-2' => array (), 'sidebar-3' => array (), 'array_version' => 3 ) );
+	update_option( 'sidebars_widgets', array ( 'wp_inactive_widgets' => array (), 'sidebar-1' => array ( 0 => 'search-2', 1 => 'recent-posts-2', 2 => 'recent-comments-2', 3 => 'archives-2', 4 => 'categories-2', 5 => 'meta-2', ), 'sidebar-2' => array (),'array_version' => 3 ) );
 
 	if ( ! is_multisite() )
 		update_user_meta( $user_id, 'show_welcome_panel', 1 );
Index: wp-includes/class-wp-theme.php
===================================================================
--- wp-includes/class-wp-theme.php	(revision 23465)
+++ wp-includes/class-wp-theme.php	(working copy)
@@ -37,11 +37,12 @@
 	 * @var array
 	 */
 	private static $default_themes = array(
-		'classic'      => 'WordPress Classic',
-		'default'      => 'WordPress Default',
-		'twentyten'    => 'Twenty Ten',
-		'twentyeleven' => 'Twenty Eleven',
-		'twentytwelve' => 'Twenty Twelve',
+		'classic'        => 'WordPress Classic',
+		'default'        => 'WordPress Default',
+		'twentyten'      => 'Twenty Ten',
+		'twentyeleven'   => 'Twenty Eleven',
+		'twentytwelve'   => 'Twenty Twelve',
+		'twentythirteen' => 'Twenty Thirteen',
 	);
 
 	/**
Index: wp-includes/default-constants.php
===================================================================
--- wp-includes/default-constants.php	(revision 23465)
+++ wp-includes/default-constants.php	(working copy)
@@ -304,6 +304,6 @@
 	 * @since 3.0.0
 	 */
 	if ( !defined('WP_DEFAULT_THEME') )
-		define( 'WP_DEFAULT_THEME', 'twentytwelve' );
+		define( 'WP_DEFAULT_THEME', 'twentythirteen' );
 
 }