diff --git a/phpunit.xml b/phpunit.xml
index e34bc8d..5e3785d 100644
--- a/phpunit.xml
+++ b/phpunit.xml
@@ -1,28 +1,30 @@
-<?xml version="1.0" encoding="UTF-8"?>
-<phpunit backupGlobals="false"
-         backupStaticAttributes="false"
-         bootstrap="vendor/autoload.php"
-         colors="true"
-         convertErrorsToExceptions="true"
-         convertNoticesToExceptions="true"
-         convertWarningsToExceptions="true"
-         processIsolation="false"
-         stopOnFailure="false">
-    <testsuites>
-        <testsuite name="Application Test Suite">
-            <directory>./tests/</directory>
-        </testsuite>
-    </testsuites>
-    <filter>
-        <whitelist processUncoveredFilesFromWhitelist="true">
-            <directory suffix=".php">./src</directory>
-        </whitelist>
-    </filter>
-    <logging>
-        <log type="coverage-clover" target="build/logs/clover.xml"/>
-        <log type="coverage-html" target="build/html"/>
-    </logging>
-    <php>
-        <env name="DB_DATABASE" value="casbin"/>
-    </php>
-</phpunit>
\ No newline at end of file
+<?xml version="1.0" encoding="UTF-8"?>
+<phpunit xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
+  backupGlobals="false" backupStaticAttributes="false" 
+  bootstrap="vendor/autoload.php" 
+  colors="true" 
+  convertErrorsToExceptions="true" 
+  convertNoticesToExceptions="true" 
+  convertWarningsToExceptions="true" 
+  processIsolation="false" 
+  stopOnFailure="false" 
+  xsi:noNamespaceSchemaLocation="https://schema.phpunit.de/9.3/phpunit.xsd">
+  <coverage processUncoveredFiles="true">
+    <include>
+      <directory suffix=".php">./src</directory>
+    </include>
+    <report>
+      <clover outputFile="build/logs/clover.xml"/>
+      <html outputDirectory="build/html"/>
+    </report>
+  </coverage>
+  <testsuites>
+    <testsuite name="Application Test Suite">
+      <directory>./tests/</directory>
+    </testsuite>
+  </testsuites>
+  <logging/>
+  <php>
+    <env name="DB_DATABASE" value="casbin"/>
+  </php>
+</phpunit>
