diff --git a/Tests/Acceptance/Application/InstallTool/UpgradeCest.php b/Tests/Acceptance/Application/InstallTool/UpgradeCest.php
index 8445f59f56..997c4107a8 100644
--- a/Tests/Acceptance/Application/InstallTool/UpgradeCest.php
+++ b/Tests/Acceptance/Application/InstallTool/UpgradeCest.php
@@ -22,8 +22,6 @@
 
 final class UpgradeCest extends AbstractCest
 {
-    private static string $alertContainerSelector = '#alert-container';
-
     public function _before(ApplicationTester $I): void
     {
         parent::_before($I);