diff --git a/wp-admin/includes/class-wp-upgrader-skin.php b/wp-admin/includes/class-wp-upgrader-skin.php
index 598724f61c..83b4ba472e 100644
--- a/wp-admin/includes/class-wp-upgrader-skin.php
+++ b/wp-admin/includes/class-wp-upgrader-skin.php
@@ -240,7 +240,14 @@ class WP_Upgrader_Skin {
 		if ( defined( 'IFRAME_REQUEST' ) ) {
 			echo '<script type="text/javascript">
 					if ( window.postMessage && JSON ) {
-						window.parent.postMessage( JSON.stringify( { action: "decrementUpdateCount", upgradeType: "' . $type . '" } ), window.location.protocol + "//" + window.location.hostname );
+						window.parent.postMessage(
+							JSON.stringify( {
+								action: "decrementUpdateCount",
+								upgradeType: "' . $type . '"
+							} ),
+							window.location.protocol + "//" + window.location.hostname
+								+ ( "" !== window.location.port ? ":" + window.location.port : "" )
+						);
 					}
 				</script>';
 		} else {
diff --git a/wp-includes/version.php b/wp-includes/version.php
index 255dd662d5..5d84983453 100644
--- a/wp-includes/version.php
+++ b/wp-includes/version.php
@@ -16,7 +16,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '6.5-alpha-57147';
+$wp_version = '6.5-alpha-57148';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.