diff --git a/wp-includes/default-constants.php b/wp-includes/default-constants.php
index 774446e9e4..c9092bd2cc 100644
--- a/wp-includes/default-constants.php
+++ b/wp-includes/default-constants.php
@@ -354,6 +354,6 @@ function wp_templating_constants() {
 	 * @see WP_Theme::get_core_default_theme()
 	 */
 	if ( !defined('WP_DEFAULT_THEME') )
-		define( 'WP_DEFAULT_THEME', 'twentyfifteen' );
+		define( 'WP_DEFAULT_THEME', 'twentysixteen' );
 
 }
diff --git a/wp-includes/version.php b/wp-includes/version.php
index b1477a384b..7b30ed946e 100644
--- a/wp-includes/version.php
+++ b/wp-includes/version.php
@@ -4,7 +4,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '4.4-beta4-35738';
+$wp_version = '4.4-beta4-35739';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.