diff --git a/.github/workflows/test-application.yaml b/.github/workflows/test-application.yaml
index fec6de7..eb71549 100644
--- a/.github/workflows/test-application.yaml
+++ b/.github/workflows/test-application.yaml
@@ -26,6 +26,7 @@ jobs:
                       coverage: false
                       dependency-versions: 'lowest'
                       tools: 'composer:v2'
+                      phpunit-config: 'phpunit-9.xml.dist'
                       env:
                           SYMFONY_DEPRECATIONS_HELPER: disabled
 
@@ -108,10 +109,10 @@ jobs:
               run: composer bootstrap-test-environment
 
             - name: Execute unit test cases
-              run: composer test -- Tests/Unit --coverage-php var/coverage.php --coverage-html coverage-report --log-junit var/junit.xml
+              run: composer test -- Tests/Unit --coverage-php var/coverage.php --coverage-html coverage-report --log-junit var/junit.xml --config ${{ matrix.phpunit-config || 'phpunit.xml.dist' }}
 
             - name: Execute functional test cases
-              run: composer test -- Tests/Functional --log-junit var/junit.xml
+              run: composer test -- Tests/Functional --log-junit var/junit.xml --config ${{ matrix.phpunit-config || 'phpunit.xml.dist' }}
 
             - name: Check code coverage
               if: ${{ matrix.coverage }}
diff --git a/phpunit-9.xml.dist b/phpunit-9.xml.dist
new file mode 100644
index 0000000..c451f89
--- /dev/null
+++ b/phpunit-9.xml.dist
@@ -0,0 +1,21 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<phpunit colors="true" bootstrap="Tests/test-bootstrap.php">
+   <testsuites>
+        <testsuite name="Sulu Headless Bundle">
+            <directory>Tests</directory>
+        </testsuite>
+    </testsuites>
+
+    <filter>
+        <whitelist addUncoveredFilesFromWhitelist="true">
+            <directory>.</directory>
+            <exclude>
+                <directory>vendor</directory>
+            </exclude>
+        </whitelist>
+    </filter>
+
+    <php>
+        <env name="KERNEL_CLASS" value="Sulu\Bundle\HeadlessBundle\Tests\Application\Kernel"/>
+    </php>
+</phpunit>
diff --git a/phpunit.xml.dist b/phpunit.xml.dist
index c451f89..8f04843 100644
--- a/phpunit.xml.dist
+++ b/phpunit.xml.dist
@@ -2,20 +2,23 @@
 <phpunit colors="true" bootstrap="Tests/test-bootstrap.php">
    <testsuites>
         <testsuite name="Sulu Headless Bundle">
-            <directory>Tests</directory>
+            <directory>./Tests</directory>
         </testsuite>
     </testsuites>
 
-    <filter>
-        <whitelist addUncoveredFilesFromWhitelist="true">
-            <directory>.</directory>
-            <exclude>
-                <directory>vendor</directory>
-            </exclude>
-        </whitelist>
-    </filter>
-
     <php>
         <env name="KERNEL_CLASS" value="Sulu\Bundle\HeadlessBundle\Tests\Application\Kernel"/>
+        <env name="APP_ENV" value="test" force="true"/>
     </php>
+
+    <source>
+        <include>
+            <directory>./</directory>
+        </include>
+        <exclude>
+            <directory>Resources/</directory>
+            <directory>Tests/</directory>
+            <directory>vendor/</directory>
+        </exclude>
+    </source>
 </phpunit>