diff -Naur a/tests/Stecman/Component/Symfony/Console/BashCompletion/Common/CompletionHandlerTestCase.php b/tests/Stecman/Component/Symfony/Console/BashCompletion/Common/CompletionHandlerTestCase.php
--- a/tests/Stecman/Component/Symfony/Console/BashCompletion/Common/CompletionHandlerTestCase.php	2022-08-08 20:51:04.000000000 +0200
+++ b/tests/Stecman/Component/Symfony/Console/BashCompletion/Common/CompletionHandlerTestCase.php	2022-08-08 21:44:36.172220345 +0200
@@ -17,7 +17,7 @@
      */
     protected $application;
 
-    public static function setUpBeforeClass()
+    public static function setUpBeforeClass(): void
     {
         require_once __DIR__ . '/../Fixtures/CompletionAwareCommand.php';
         require_once __DIR__ . '/../Fixtures/HiddenCommand.php';
@@ -25,7 +25,7 @@
         require_once __DIR__ . '/../Fixtures/TestSymfonyStyleCommand.php';
     }
 
-    protected function setUp()
+    protected function setUp(): void
     {
         $this->application = new Application('Base application');
         $this->application->addCommands(array(
diff -Naur a/tests/Stecman/Component/Symfony/Console/BashCompletion/HookFactoryTest.php b/tests/Stecman/Component/Symfony/Console/BashCompletion/HookFactoryTest.php
--- a/tests/Stecman/Component/Symfony/Console/BashCompletion/HookFactoryTest.php	2022-08-08 20:51:04.000000000 +0200
+++ b/tests/Stecman/Component/Symfony/Console/BashCompletion/HookFactoryTest.php	2022-08-08 21:46:56.761138008 +0200
@@ -12,7 +12,7 @@
      */
     protected $factory;
 
-    protected function setUp()
+    protected function setUp(): void
     {
         $this->factory = new HookFactory();
     }