diff --git a/tests/HelloWorldTest.php b/tests/HelloWorldTest.php
index dae50a8..093ab50 100644
--- a/tests/HelloWorldTest.php
+++ b/tests/HelloWorldTest.php
@@ -10,11 +10,11 @@ class_alias('\PHPUnit_Framework_TestCase', '\PHPUnit\Framework\TestCase');
  */
 class HelloWorldTest extends \PHPUnit\Framework\TestCase
 {
-    public function setUp()
+    public function setUp(): void
     {
     }
 
-    public function testHelloWorld()
+    public function testHelloWorld(): void
     {
         $this->assertEquals('Hello World', 'Hello World');
     }