diff --git a/wp-includes/version.php b/wp-includes/version.php
index 5c0af1d98b..fefe6701f4 100644
--- a/wp-includes/version.php
+++ b/wp-includes/version.php
@@ -16,7 +16,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '6.6-alpha-58208';
+$wp_version = '6.6-alpha-58209';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.
diff --git a/wp-login.php b/wp-login.php
index 18811aae57..21e000dc40 100644
--- a/wp-login.php
+++ b/wp-login.php
@@ -34,13 +34,17 @@ if ( force_ssl_admin() && ! is_ssl() ) {
  * @global string      $action        The action that brought the visitor to the login page.
  *
  * @param string   $title    Optional. WordPress login Page title to display in the `<title>` element.
- *                           Default 'Log In'.
+ *                           Default null, which displays 'Log In'.
  * @param string   $message  Optional. Message to display in header. Default empty.
  * @param WP_Error $wp_error Optional. The error to pass. Default is a WP_Error instance.
  */
-function login_header( $title = 'Log In', $message = '', $wp_error = null ) {
+function login_header( $title = null, $message = '', $wp_error = null ) {
 	global $error, $interim_login, $action;
 
+	if ( null === $title ) {
+		$title = __( 'Log In' );
+	}
+
 	// Don't index any of these forms.
 	add_filter( 'wp_robots', 'wp_robots_sensitive_page' );
 	add_action( 'login_head', 'wp_strict_cross_origin_referrer' );