diff --git a/wp-admin/includes/class-wp-upgrader.php b/wp-admin/includes/class-wp-upgrader.php
index 6c6cb5d828..4064dfb644 100644
--- a/wp-admin/includes/class-wp-upgrader.php
+++ b/wp-admin/includes/class-wp-upgrader.php
@@ -1008,8 +1008,18 @@ class WP_Upgrader {
 		global $wp_filesystem;
 
 		if ( ! $wp_filesystem ) {
-			require_once ABSPATH . 'wp-admin/includes/file.php';
-			WP_Filesystem();
+			if ( ! function_exists( 'WP_Filesystem' ) ) {
+				require_once ABSPATH . 'wp-admin/includes/file.php';
+			}
+
+			ob_start();
+			$credentials = request_filesystem_credentials( '' );
+			ob_end_clean();
+
+			if ( false === $credentials || ! WP_Filesystem( $credentials ) ) {
+				wp_trigger_error( __FUNCTION__, __( 'Could not access filesystem.' ) );
+				return;
+			}
 		}
 
 		$file = $wp_filesystem->abspath() . '.maintenance';
diff --git a/wp-includes/version.php b/wp-includes/version.php
index ae2bd64993..a12e33195a 100644
--- a/wp-includes/version.php
+++ b/wp-includes/version.php
@@ -16,7 +16,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '6.8.1-alpha-60171';
+$wp_version = '6.8.1-alpha-60184';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.