diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 8fa7ab5..dcd0435 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -21,7 +21,7 @@ jobs:
             code-analysis: 'yes'
     steps:
       - name: Checkout
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
 
       - name: Setup PHP, with composer and extensions
         uses: shivammathur/setup-php@v2 #https://github.com/shivammathur/setup-php
diff --git a/composer.json b/composer.json
index 017df03..936d991 100644
--- a/composer.json
+++ b/composer.json
@@ -44,7 +44,7 @@
         }
     },
     "require-dev": {
-        "friendsofphp/php-cs-fixer": "^3.20",
+        "friendsofphp/php-cs-fixer": "^3.38",
         "phpstan/phpstan": "^1.10",
         "phpunit/phpunit" : "^9.6"
     },
diff --git a/tests/phpunit.xml b/tests/phpunit.xml
index b8c6073..82592a2 100644
--- a/tests/phpunit.xml
+++ b/tests/phpunit.xml
@@ -1,4 +1,6 @@
+<?xml version="1.0"?>
 <phpunit
+  xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
   colors="true"
   bootstrap="../vendor/autoload.php"
   convertErrorsToExceptions="true"
@@ -6,16 +8,16 @@
   convertWarningsToExceptions="true"
   beStrictAboutTestsThatDoNotTestAnything="true"
   beStrictAboutOutputDuringTests="true"
+  xsi:noNamespaceSchemaLocation="https://schema.phpunit.de/9.3/phpunit.xsd"
   >
+  <coverage includeUncoveredFiles="true">
+    <include>
+      <directory suffix=".php">../lib/</directory>
+    </include>
+  </coverage>
   <testsuites>
     <testsuite name="Sabre_XML">
       <directory>.</directory>
     </testsuite>
   </testsuites>
-
-  <filter>
-    <whitelist addUncoveredFilesFromWhitelist="true">
-       <directory suffix=".php">../lib/</directory>
-    </whitelist>
-  </filter>
 </phpunit>