diff --git a/phpunit.xml b/phpunit.xml
index b4d7c1e..444f5b1 100644
--- a/phpunit.xml
+++ b/phpunit.xml
@@ -1,18 +1,13 @@
-<phpunit
-    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
-    xsi:noNamespaceSchemaLocation="https://schema.phpunit.de/6.3/phpunit.xsd"
-    verbose="false">
-
-    <testsuites>
-        <testsuite name="all">
-            <directory suffix="Test.php" phpVersion="7.2" phpVersionOperator=">=">test</directory>
-        </testsuite>
-    </testsuites>
-
-    <filter>
-        <whitelist processUncoveredFilesFromWhitelist="true">
-            <directory suffix=".php">src</directory>
-        </whitelist>
-    </filter>
-
+<?xml version="1.0"?>
+<phpunit xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="https://schema.phpunit.de/9.3/phpunit.xsd" verbose="false">
+  <coverage processUncoveredFiles="true">
+    <include>
+      <directory suffix=".php">src</directory>
+    </include>
+  </coverage>
+  <testsuites>
+    <testsuite name="all">
+      <directory suffix="Test.php" phpVersion="7.2" phpVersionOperator="&gt;=">test</directory>
+    </testsuite>
+  </testsuites>
 </phpunit>