diff --git a/phpunit.xml b/phpunit.xml
index 4bbd404..124671c 100644
--- a/phpunit.xml
+++ b/phpunit.xml
@@ -1,15 +1,16 @@
-<phpunit>
-    <testsuites>
-        <testsuite name="ably">
-            <directory>tests</directory>
-        </testsuite>
-    </testsuites>
-    <listeners>
-        <listener file="tests/extensions/DebugTestListener.php" class="DebugTestListener" />
-    </listeners>
-    <filter>
-        <whitelist>
-            <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">
+  <coverage>
+    <include>
+      <directory suffix=".php">src</directory>
+    </include>
+  </coverage>
+  <testsuites>
+    <testsuite name="ably">
+      <directory>tests</directory>
+    </testsuite>
+  </testsuites>
+  <listeners>
+    <listener file="tests/extensions/DebugTestListener.php" class="DebugTestListener"/>
+  </listeners>
 </phpunit>