diff --git a/tests/Feature/BooksTest.php b/tests/Feature/BooksTest.php
index 83ade8800..952afe337 100644
--- a/tests/Feature/BooksTest.php
+++ b/tests/Feature/BooksTest.php
@@ -4,7 +4,7 @@ namespace Tests\Feature;
 
 use Tests\TestCase;
 
-class BooksTest extends TestCase
+final class BooksTest extends TestCase
 {
     /**
      * @throws \DariusIII\ItunesApi\Exceptions\InvalidProviderException
diff --git a/tests/Feature/SettingsTest.php b/tests/Feature/SettingsTest.php
index d3e5b6d11..0fec271c1 100644
--- a/tests/Feature/SettingsTest.php
+++ b/tests/Feature/SettingsTest.php
@@ -4,7 +4,7 @@ namespace Tests\Feature;
 
 use Tests\TestCase;
 
-class SettingsTest extends TestCase
+final class SettingsTest extends TestCase
 {
     public function testSettingValue(): void
     {
diff --git a/tests/Install/InstallTest.php b/tests/Install/InstallTest.php
index 10dce04c9..a782a9b29 100644
--- a/tests/Install/InstallTest.php
+++ b/tests/Install/InstallTest.php
@@ -18,7 +18,7 @@ require_once \dirname(__DIR__, 2).DIRECTORY_SEPARATOR.'bootstrap/autoload.php';
 /**
  * Class InstallTest.
  */
-class InstallTest extends \PHPUnit\Framework\TestCase
+final class InstallTest extends \PHPUnit\Framework\TestCase
 {
     public function testFullInstall(): void
     {
diff --git a/tests/Unit/ExampleTest.php b/tests/Unit/ExampleTest.php
index 5773b0ceb..fff6e3c4c 100644
--- a/tests/Unit/ExampleTest.php
+++ b/tests/Unit/ExampleTest.php
@@ -4,7 +4,7 @@ namespace Tests\Unit;
 
 use PHPUnit\Framework\TestCase;
 
-class ExampleTest extends TestCase
+final class ExampleTest extends TestCase
 {
     /**
      * A basic test example.