diff --git a/src/Swiftlet/tests/AppTest.php b/src/Swiftlet/tests/AppTest.php
index 178a3c4..c082387 100644
--- a/src/Swiftlet/tests/AppTest.php
+++ b/src/Swiftlet/tests/AppTest.php
@@ -5,8 +5,9 @@
 require_once 'vendor/autoload.php';
 
 use \Mock\Controllers\Index as IndexController;
+use \PHPUnit\Framework\TestCase;
 
-class AppTest extends \PHPUnit_Framework_TestCase
+class AppTest extends TestCase
 {
 	protected $app;
 
diff --git a/src/Swiftlet/tests/ControllerTest.php b/src/Swiftlet/tests/ControllerTest.php
index 187be4d..5cded8f 100644
--- a/src/Swiftlet/tests/ControllerTest.php
+++ b/src/Swiftlet/tests/ControllerTest.php
@@ -5,8 +5,9 @@
 require_once 'vendor/autoload.php';
 
 use \Mock\Controllers\Index as IndexController;
+use \PHPUnit\Framework\TestCase;
 
-class ControllerTest extends \PHPUnit_Framework_TestCase
+class ControllerTest extends TestCase
 {
 	protected $controller;
 
diff --git a/src/Swiftlet/tests/LibraryTest.php b/src/Swiftlet/tests/LibraryTest.php
index fea394f..631f2e3 100644
--- a/src/Swiftlet/tests/LibraryTest.php
+++ b/src/Swiftlet/tests/LibraryTest.php
@@ -5,8 +5,9 @@
 require_once 'vendor/autoload.php';
 
 use \Mock\Libraries\Mock as MockLibrary;
+use \PHPUnit\Framework\TestCase;
 
-class LibraryTest extends \PHPUnit_Framework_TestCase
+class LibraryTest extends TestCase
 {
 	protected $library;
 
diff --git a/src/Swiftlet/tests/ListenerTest.php b/src/Swiftlet/tests/ListenerTest.php
index b8261e8..302e4a3 100644
--- a/src/Swiftlet/tests/ListenerTest.php
+++ b/src/Swiftlet/tests/ListenerTest.php
@@ -2,9 +2,11 @@
 
 namespace Mock;
 
+use \PHPUnit\Framework\TestCase;
+
 require_once 'vendor/autoload.php';
 
-class ListenerTest extends \PHPUnit_Framework_TestCase
+class ListenerTest extends TestCase
 {
 	protected $listener;
 
diff --git a/src/Swiftlet/tests/ViewTest.php b/src/Swiftlet/tests/ViewTest.php
index 6e9dd4a..384f402 100644
--- a/src/Swiftlet/tests/ViewTest.php
+++ b/src/Swiftlet/tests/ViewTest.php
@@ -2,9 +2,11 @@
 
 namespace Swiftlet;
 
+use \PHPUnit\Framework\TestCase;
+
 require_once 'vendor/autoload.php';
 
-class ViewTest extends \PHPUnit_Framework_TestCase
+class ViewTest extends TestCase
 {
 	protected $view;