diff --git a/phpunit.xml.dist b/phpunit.xml.dist
index 5f6132c..3fc9d94 100644
--- a/phpunit.xml.dist
+++ b/phpunit.xml.dist
@@ -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/10.0/phpunit.xsd"
+    xsi:noNamespaceSchemaLocation="https://schema.phpunit.de/9.6/phpunit.xsd"
     bootstrap="vendor/autoload.php"
     cacheResultFile=".tmp/PHPUnit/.phpunit.result.cache"
     colors="true"
@@ -14,7 +14,7 @@
 
     <coverage cacheDirectory=".tmp/PHPUnit">
         <include>
-            <directory suffix=".php">src</directory>
+            <directory>src</directory>
         </include>
     </coverage>
 </phpunit>