diff --git a/tests/TestCase.php b/tests/TestCase.php
index aeff011..78b4256 100644
--- a/tests/TestCase.php
+++ b/tests/TestCase.php
@@ -9,7 +9,7 @@
 
 abstract class TestCase extends Orchestra
 {
-    public function setUp()
+    public function setUp(): void
     {
         parent::setUp();