diff --git a/wp-includes/default-constants.php b/wp-includes/default-constants.php
index 5bccc204cd..ccc3960ce8 100644
--- a/wp-includes/default-constants.php
+++ b/wp-includes/default-constants.php
@@ -325,9 +325,10 @@ function wp_cookie_constants() {
 
 	/**
 	 * @since 2.0.0
+	 * @since 6.5.0 The value has changed from false to an empty string.
 	 */
 	if ( ! defined( 'COOKIE_DOMAIN' ) ) {
-		define( 'COOKIE_DOMAIN', false );
+		define( 'COOKIE_DOMAIN', '' );
 	}
 
 	if ( ! defined( 'RECOVERY_MODE_COOKIE' ) ) {
diff --git a/wp-includes/version.php b/wp-includes/version.php
index ea63857307..e72d1fe06d 100644
--- a/wp-includes/version.php
+++ b/wp-includes/version.php
@@ -16,7 +16,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '6.6-alpha-58010';
+$wp_version = '6.6-alpha-58011';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.