diff --git a/tests/.gitignore b/tests/.gitignore
index c7bcd248..494e54b8 100644
--- a/tests/.gitignore
+++ b/tests/.gitignore
@@ -10,3 +10,5 @@ TestResults.tap
 TestResults.txt
 .templates_c/*.php
 .cache/*.php
+/composer.lock
+/vendor
\ No newline at end of file
diff --git a/tests/Bootstrap.php b/tests/Bootstrap.php
index c407fe0b..efb3723d 100644
--- a/tests/Bootstrap.php
+++ b/tests/Bootstrap.php
@@ -26,10 +26,12 @@ if (!defined('SMARTY_COMPOSER_INSTALL')) {
     }
     unset($file);
 }
-if (!class_exists('PHPUnit_Framework_TestCase')) {
+if (!class_exists('PHPUnit_Framework_TestCase') && !class_exists('\PHPUnit\Framework\TestCase')) {
     require_once SMARTY_COMPOSER_INSTALL;
 }
-
+if (!class_exists('\PHPUnit_Framework_TestCase') && class_exists('\PHPUnit\Framework\TestCase')) {
+    class_alias('\PHPUnit\Framework\TestCase', '\PHPUnit_Framework_TestCase');
+}
 require_once 'PHPUnit_Smarty.php';
 if (!ini_get('date.timezone')) {
     ini_set('date.timezone', 'Europe/Berlin');
diff --git a/tests/composer.json b/tests/composer.json
index 2a22df0f..9821b715 100644
--- a/tests/composer.json
+++ b/tests/composer.json
@@ -25,8 +25,8 @@
     "forum": "http://www.smarty.net/forums/"
   },
   "require": {
-    "phpunit/phpunit": "4.6.6",
-    "php": ">=5.2"
+    "phpunit/phpunit": "~5.7",
+    "php": ">=5.3"
   },
   "autoload": {
     "classmap": [