diff --git a/tests/TestCase.php b/tests/TestCase.php
index e2a6b04..b7c9964 100644
--- a/tests/TestCase.php
+++ b/tests/TestCase.php
@@ -16,7 +16,7 @@ class TestCase extends \Orchestra\Testbench\TestCase
         ]);
     }
 
-    protected function setUp()
+    protected function setUp(): void
     {
         parent::setUp();