diff --git a/composer.json b/composer.json
index 5823960..a575235 100644
--- a/composer.json
+++ b/composer.json
@@ -10,7 +10,7 @@
         "php": ">=5.2.4"
     },
     "require-dev": {
-        "phpunit/phpunit": "3.7.*"
+        "phpunit/phpunit": "> 5.4.3"
     },
     "authors": [
         {
diff --git a/tests/SqlFormatterTest.php b/tests/SqlFormatterTest.php
index a7951e8..a3e40db 100644
--- a/tests/SqlFormatterTest.php
+++ b/tests/SqlFormatterTest.php
@@ -4,7 +4,9 @@
 // Force SqlFormatter to run in non-CLI mode for tests
 SqlFormatter::$cli = false;
 
-class SqlFormatterTest extends PHPUnit_Framework_TestCase {
+use PHPUnit\Framework\TestCase;
+
+class SqlFormatterTest extends TestCase {
 	protected $sqlData;
 	
 	/**