diff --git a/tests/SyncTestCase.php b/tests/SyncTestCase.php
--- a/tests/SyncTestCase.php
+++ b/tests/SyncTestCase.php
@@ -364,10 +364,10 @@
     /**
      * adapter for phpunit < 9
      */
-    protected function assertMatchesRegularExpression($arg1, $arg2)
+    public static function assertMatchesRegularExpression(string $arg1, string $arg2, string $message = ''): void
     {
         if (method_exists("PHPUnit\Framework\TestCase", "assertMatchesRegularExpression")) {
-            parent::assertMatchesRegularExpression($arg1, $arg2);
+            parent::assertMatchesRegularExpression($arg1, $arg2, $message);
         } else {
             parent::assertRegExp($arg1, $arg2);
         }