diff --git a/composer.json b/composer.json
index a85632b..06fb482 100644
--- a/composer.json
+++ b/composer.json
@@ -36,7 +36,7 @@
 		"leafo/scssphp": "~0.6.6",
 		"marcusschwarz/lesserphp": "~0.5.1",
 		"meenie/javascript-packer": "~1.1",
-		"phpunit/phpunit": "4.8.*",
+		"phpunit/phpunit": "^4.8.36",
 		"tedivm/jshrink": "~1.1.0"
 	},
 	"suggest": {
diff --git a/tests/TestCase.php b/tests/TestCase.php
index f763412..2987edf 100644
--- a/tests/TestCase.php
+++ b/tests/TestCase.php
@@ -1,6 +1,6 @@
 <?php
 
-class TestCase extends PHPUnit_Framework_TestCase
+abstract class TestCase extends \PHPUnit\Framework\TestCase
 {
     /** @var string */
     protected static $document_root;