Index: src/wp-admin/includes/update-core.php
===================================================================
--- src/wp-admin/includes/update-core.php	(revision 38830)
+++ src/wp-admin/includes/update-core.php	(working copy)
@@ -735,14 +735,15 @@
 global $_new_bundled_files;
 
 $_new_bundled_files = array(
-	'plugins/akismet/'       => '2.0',
-	'themes/twentyten/'      => '3.0',
-	'themes/twentyeleven/'   => '3.2',
-	'themes/twentytwelve/'   => '3.5',
-	'themes/twentythirteen/' => '3.6',
-	'themes/twentyfourteen/' => '3.8',
-	'themes/twentyfifteen/'  => '4.1',
-	'themes/twentysixteen/'  => '4.4',
+	'plugins/akismet/'        => '2.0',
+	'themes/twentyten/'       => '3.0',
+	'themes/twentyeleven/'    => '3.2',
+	'themes/twentytwelve/'    => '3.5',
+	'themes/twentythirteen/'  => '3.6',
+	'themes/twentyfourteen/'  => '3.8',
+	'themes/twentyfifteen/'   => '4.1',
+	'themes/twentysixteen/'   => '4.4',
+	'themes/twentyseventeen/' => '4.7',
 );
 
 // If not explicitly defined as false, don't install new default themes.
Index: src/wp-includes/class-wp-theme.php
===================================================================
--- src/wp-includes/class-wp-theme.php	(revision 38830)
+++ src/wp-includes/class-wp-theme.php	(working copy)
@@ -48,15 +48,16 @@
 	 * @var array
 	 */
 	private static $default_themes = array(
-		'classic'        => 'WordPress Classic',
-		'default'        => 'WordPress Default',
-		'twentyten'      => 'Twenty Ten',
-		'twentyeleven'   => 'Twenty Eleven',
-		'twentytwelve'   => 'Twenty Twelve',
-		'twentythirteen' => 'Twenty Thirteen',
-		'twentyfourteen' => 'Twenty Fourteen',
-		'twentyfifteen'  => 'Twenty Fifteen',
-		'twentysixteen'  => 'Twenty Sixteen',
+		'classic'          => 'WordPress Classic',
+		'default'          => 'WordPress Default',
+		'twentyten'        => 'Twenty Ten',
+		'twentyeleven'     => 'Twenty Eleven',
+		'twentytwelve'     => 'Twenty Twelve',
+		'twentythirteen'   => 'Twenty Thirteen',
+		'twentyfourteen'   => 'Twenty Fourteen',
+		'twentyfifteen'    => 'Twenty Fifteen',
+		'twentysixteen'    => 'Twenty Sixteen',
+		'twentyseventeen'  => 'Twenty Seventeen',
 	);
 
 	/**
Index: src/wp-includes/default-constants.php
===================================================================
--- src/wp-includes/default-constants.php	(revision 38830)
+++ src/wp-includes/default-constants.php	(working copy)
@@ -357,6 +357,6 @@
 	 * @see WP_Theme::get_core_default_theme()
 	 */
 	if ( !defined('WP_DEFAULT_THEME') )
-		define( 'WP_DEFAULT_THEME', 'twentysixteen' );
+		define( 'WP_DEFAULT_THEME', 'twentyseventeen' );
 
 }
Index: tests/phpunit/tests/theme.php
===================================================================
--- tests/phpunit/tests/theme.php	(revision 38830)
+++ tests/phpunit/tests/theme.php	(working copy)
@@ -10,7 +10,7 @@
 	protected $theme_name = 'Twenty Eleven';
 	protected $default_themes = array(
 		'twentyten', 'twentyeleven', 'twentytwelve', 'twentythirteen',
-		'twentyfourteen', 'twentyfifteen',
+		'twentyfourteen', 'twentyfifteen', 'twentyseventeen',
 	);
 
 	function setUp() {