diff --git a/Admin/Updater.php b/Admin/Updater.php
index d439445..537d8f9 100644
--- a/Admin/Updater.php
+++ b/Admin/Updater.php
@@ -33,7 +33,7 @@ class Updater extends UpdaterAbstract
     /**
      * {@inheritdoc}
      */
-    public static function update(DatabasePool $dbPool, InfoManager $info)
+    public static function update(DatabasePool $dbPool, InfoManager $info) : void
     {
         Directory::deletePath(__DIR__ . '/Update');
         mkdir('Update');