diff --git a/tests/Bootstrap/AppManangerTest.php b/tests/Bootstrap/AppManangerTest.php
index 8c60d1e..1375a32 100644
--- a/tests/Bootstrap/AppManangerTest.php
+++ b/tests/Bootstrap/AppManangerTest.php
@@ -9,7 +9,7 @@ use Tests\TestCase;
 
 class AppManangerTest extends TestCase
 {
-    public function test_it_returns_an_app_instance()
+    public function test_it_returns_an_app_instance(): void
     {
         $callableResolver = $this->container->get(CallableResolver::class);
         $app = (new AppManager($this->container, $this->config, $callableResolver))();
diff --git a/tests/Controllers/DirectoryControllerTest.php b/tests/Controllers/DirectoryControllerTest.php
index 6722a1f..976c311 100644
--- a/tests/Controllers/DirectoryControllerTest.php
+++ b/tests/Controllers/DirectoryControllerTest.php
@@ -57,7 +57,7 @@ class DirectoryControllerTest extends TestCase
         $this->assertEquals(200, $response->getStatusCode());
     }
 
-    public function test_it_returns_a_404_error_when_not_found()
+    public function test_it_returns_a_404_error_when_not_found(): void
     {
         $this->container->call(TwigProvider::class);