diff --git a/modules/openapi-generator/src/main/resources/php/phpunit.xml.mustache b/modules/openapi-generator/src/main/resources/php/phpunit.xml.mustache
index 66b2c40c983..b72fb7c6e77 100644
--- a/modules/openapi-generator/src/main/resources/php/phpunit.xml.mustache
+++ b/modules/openapi-generator/src/main/resources/php/phpunit.xml.mustache
@@ -1,23 +1,18 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<phpunit bootstrap="./vendor/autoload.php"
-         colors="true"
-         convertErrorsToExceptions="true"
-         convertNoticesToExceptions="true"
-         convertWarningsToExceptions="true"
-         stopOnFailure="false">
-    <testsuites>
-        <testsuite name="tests">
-            <directory>{{apiTestPath}}</directory>
-            <directory>{{modelTestPath}}</directory>
-        </testsuite>
-    </testsuites>
-    <filter>
-        <whitelist processUncoveredFilesFromWhitelist="true">
-            <directory suffix=".php">{{apiSrcPath}}</directory>
-            <directory suffix=".php">{{modelSrcPath}}</directory>
-        </whitelist>
-    </filter>
-    <php>
-        <ini name="error_reporting" value="E_ALL" />
-    </php>
+<phpunit xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" bootstrap="./vendor/autoload.php" colors="true" convertErrorsToExceptions="true" convertNoticesToExceptions="true" convertWarningsToExceptions="true" stopOnFailure="false" xsi:noNamespaceSchemaLocation="https://schema.phpunit.de/9.3/phpunit.xsd">
+  <coverage processUncoveredFiles="true">
+    <include>
+      <directory suffix=".php">{{apiSrcPath}}</directory>
+      <directory suffix=".php">{{modelSrcPath}}</directory>
+    </include>
+  </coverage>
+  <testsuites>
+    <testsuite name="tests">
+      <directory>{{apiTestPath}}</directory>
+      <directory>{{modelTestPath}}</directory>
+    </testsuite>
+  </testsuites>
+  <php>
+    <ini name="error_reporting" value="E_ALL"/>
+  </php>
 </phpunit>
diff --git a/samples/client/petstore/php/OpenAPIClient-php/phpunit.xml.dist b/samples/client/petstore/php/OpenAPIClient-php/phpunit.xml.dist
index 3dd90bbe32c..485899aaf21 100644
--- a/samples/client/petstore/php/OpenAPIClient-php/phpunit.xml.dist
+++ b/samples/client/petstore/php/OpenAPIClient-php/phpunit.xml.dist
@@ -1,23 +1,18 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<phpunit bootstrap="./vendor/autoload.php"
-         colors="true"
-         convertErrorsToExceptions="true"
-         convertNoticesToExceptions="true"
-         convertWarningsToExceptions="true"
-         stopOnFailure="false">
-    <testsuites>
-        <testsuite name="tests">
-            <directory>./test/Api</directory>
-            <directory>./test/Model</directory>
-        </testsuite>
-    </testsuites>
-    <filter>
-        <whitelist processUncoveredFilesFromWhitelist="true">
-            <directory suffix=".php">./lib/Api</directory>
-            <directory suffix=".php">./lib/Model</directory>
-        </whitelist>
-    </filter>
-    <php>
-        <ini name="error_reporting" value="E_ALL" />
-    </php>
+<phpunit xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" bootstrap="./vendor/autoload.php" colors="true" convertErrorsToExceptions="true" convertNoticesToExceptions="true" convertWarningsToExceptions="true" stopOnFailure="false" xsi:noNamespaceSchemaLocation="https://schema.phpunit.de/9.3/phpunit.xsd">
+  <coverage processUncoveredFiles="true">
+    <include>
+      <directory suffix=".php">./lib/Api</directory>
+      <directory suffix=".php">./lib/Model</directory>
+    </include>
+  </coverage>
+  <testsuites>
+    <testsuite name="tests">
+      <directory>./test/Api</directory>
+      <directory>./test/Model</directory>
+    </testsuite>
+  </testsuites>
+  <php>
+    <ini name="error_reporting" value="E_ALL"/>
+  </php>
 </phpunit>