diff --git a/tests/Kernel/TwigAppKernel.php b/tests/Kernel/TwigAppKernel.php
index 664f159..1605c06 100644
--- a/tests/Kernel/TwigAppKernel.php
+++ b/tests/Kernel/TwigAppKernel.php
@@ -33,7 +33,7 @@ class TwigAppKernel extends Kernel
 
     public function registerContainerConfiguration(LoaderInterface $loader): void
     {
-        $loader->load(function (ContainerBuilder $container) {
+        $loader->load(static function (ContainerBuilder $container) {
             $container->loadFromExtension('framework', [
                 'secret' => '$ecret',
                 'test' => true,