diff --git a/phpunit.xml b/phpunit.xml
index 6d50fc8..23404a2 100644
--- a/phpunit.xml
+++ b/phpunit.xml
@@ -10,7 +10,7 @@
          beStrictAboutTodoAnnotatedTests="true"
          failOnRisky="true"
          failOnWarning="true"
-         xsi:noNamespaceSchemaLocation="https://schema.phpunit.de/9.3/phpunit.xsd"
+         xsi:noNamespaceSchemaLocation="vendor/phpunit/phpunit/phpunit.xml"
 >
     <coverage>
         <include>