diff --git a/tests/phpunit.integration.xml b/tests/phpunit.integration.xml
index e3e14ea..849ceb5 100644
--- a/tests/phpunit.integration.xml
+++ b/tests/phpunit.integration.xml
@@ -1,7 +1,7 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <phpunit
     xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
-    xsi:noNamespaceSchemaLocation="https://schema.phpunit.de/10.5/phpunit.xsd"
+    xsi:noNamespaceSchemaLocation="../../../vendor/phpunit/phpunit/phpunit.xsd"
     backupGlobals="false"
     cacheDirectory=".phpunit.cache"
     backupStaticProperties="false"
diff --git a/tests/phpunit.unit.xml b/tests/phpunit.unit.xml
index 67367a7..5cf94ab 100644
--- a/tests/phpunit.unit.xml
+++ b/tests/phpunit.unit.xml
@@ -1,7 +1,7 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <phpunit
     xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
-    xsi:noNamespaceSchemaLocation="https://schema.phpunit.de/10.5/phpunit.xsd"
+    xsi:noNamespaceSchemaLocation="../../../vendor/phpunit/phpunit/phpunit.xsd"
     backupGlobals="false"
     cacheDirectory=".phpunit.cache"
     backupStaticProperties="false"