diff --git a/modules/custom/az_cas/tests/src/Functional/AzCasDisableLoginFormTest.php b/modules/custom/az_cas/tests/src/Functional/AzCasDisableLoginFormTest.php
index 925389465e..a2ba23ab1b 100644
--- a/modules/custom/az_cas/tests/src/Functional/AzCasDisableLoginFormTest.php
+++ b/modules/custom/az_cas/tests/src/Functional/AzCasDisableLoginFormTest.php
@@ -4,12 +4,15 @@
 
 use Drupal\Core\Url;
 use Drupal\Tests\az_core\Functional\QuickstartFunctionalTestBase;
+use PHPUnit\Framework\Attributes\DataProvider;
+use PHPUnit\Framework\Attributes\Group;
+use PHPUnit\Framework\Attributes\RunTestsInSeparateProcesses;
 
 /**
  * Tests that access to the user login form can be disabled.
- *
- * @group az_cas
  */
+#[Group('az_cas')]
+#[RunTestsInSeparateProcesses]
 class AzCasDisableLoginFormTest extends QuickstartFunctionalTestBase {
 
   /**
@@ -51,9 +54,8 @@ protected function setUp(): void {
 
   /**
    * Tests that access to the user login form is disabled.
-   *
-   * @dataProvider azCasSettingsProvider
    */
+  #[DataProvider('azCasSettingsProvider')]
   public function testUserLoginFormBehavior($disable_login_form) {
     $edit = [
       'disable_login_form' => $disable_login_form,
diff --git a/modules/custom/az_cas/tests/src/Functional/AzCasDisablePasswordResetTest.php b/modules/custom/az_cas/tests/src/Functional/AzCasDisablePasswordResetTest.php
index 64d627d6d4..7183c424cb 100644
--- a/modules/custom/az_cas/tests/src/Functional/AzCasDisablePasswordResetTest.php
+++ b/modules/custom/az_cas/tests/src/Functional/AzCasDisablePasswordResetTest.php
@@ -3,12 +3,15 @@
 namespace Drupal\Tests\az_cas\Functional;
 
 use Drupal\Tests\az_core\Functional\QuickstartFunctionalTestBase;
+use PHPUnit\Framework\Attributes\DataProvider;
+use PHPUnit\Framework\Attributes\Group;
+use PHPUnit\Framework\Attributes\RunTestsInSeparateProcesses;
 
 /**
  * Tests that access to the password reset form can be disabled.
- *
- * @group az_cas
  */
+#[Group('az_cas')]
+#[RunTestsInSeparateProcesses]
 class AzCasDisablePasswordResetTest extends QuickstartFunctionalTestBase {
 
   /**
@@ -50,9 +53,8 @@ protected function setUp(): void {
 
   /**
    * Tests that access to the password reset form is disabled.
-   *
-   * @dataProvider azCasSettingsProvider
    */
+  #[DataProvider('azCasSettingsProvider')]
   public function testPasswordResetBehavior($disable_password_recovery_link) {
     $edit = [
       'disable_password_recovery_link' => $disable_password_recovery_link,
diff --git a/modules/custom/az_cas/tests/src/Functional/AzCasTest.php b/modules/custom/az_cas/tests/src/Functional/AzCasTest.php
index 9fdd8b0335..c6c25dbf68 100644
--- a/modules/custom/az_cas/tests/src/Functional/AzCasTest.php
+++ b/modules/custom/az_cas/tests/src/Functional/AzCasTest.php
@@ -4,12 +4,14 @@
 
 use Drupal\Core\Url;
 use Drupal\Tests\az_core\Functional\QuickstartFunctionalTestBase;
+use PHPUnit\Framework\Attributes\Group;
+use PHPUnit\Framework\Attributes\RunTestsInSeparateProcesses;
 
 /**
  * Tests for the AZ CAS module.
- *
- * @group az_cas
  */
+#[Group('az_cas')]
+#[RunTestsInSeparateProcesses]
 class AzCasTest extends QuickstartFunctionalTestBase {
 
   /**
diff --git a/modules/custom/az_core/az_enterprise_attributes_import/tests/src/Functional/EnterpriseAttributesImportTest.php b/modules/custom/az_core/az_enterprise_attributes_import/tests/src/Functional/EnterpriseAttributesImportTest.php
index 25f184a455..af75139148 100644
--- a/modules/custom/az_core/az_enterprise_attributes_import/tests/src/Functional/EnterpriseAttributesImportTest.php
+++ b/modules/custom/az_core/az_enterprise_attributes_import/tests/src/Functional/EnterpriseAttributesImportTest.php
@@ -5,12 +5,14 @@
 use Drupal\Tests\BrowserTestBase;
 use Drupal\migrate\MigrateMessage;
 use Drupal\migrate_tools\MigrateExecutable;
+use PHPUnit\Framework\Attributes\Group;
+use PHPUnit\Framework\Attributes\RunTestsInSeparateProcesses;
 
 /**
  * Test of attribute import functionality.
- *
- * @group az_enterprise_attributes_import
  */
+#[Group('az_enterprise_attributes_import')]
+#[RunTestsInSeparateProcesses]
 class EnterpriseAttributesImportTest extends BrowserTestBase {
 
   /**
diff --git a/modules/custom/az_core/tests/src/Functional/CacheInvalidationTest.php b/modules/custom/az_core/tests/src/Functional/CacheInvalidationTest.php
index e4dadaded1..0d91a06cf4 100644
--- a/modules/custom/az_core/tests/src/Functional/CacheInvalidationTest.php
+++ b/modules/custom/az_core/tests/src/Functional/CacheInvalidationTest.php
@@ -3,12 +3,14 @@
 namespace Drupal\Tests\az_core\Functional;
 
 use Drupal\Tests\BrowserTestBase;
+use PHPUnit\Framework\Attributes\Group;
+use PHPUnit\Framework\Attributes\RunTestsInSeparateProcesses;
 
 /**
  * Tests cache invalidation when nodes are updated.
- *
- * @group az_core
  */
+#[Group('az_core')]
+#[RunTestsInSeparateProcesses]
 class CacheInvalidationTest extends BrowserTestBase {
 
   /**
diff --git a/modules/custom/az_core/tests/src/Functional/ClearCacheTest.php b/modules/custom/az_core/tests/src/Functional/ClearCacheTest.php
index 92d36a459f..e516aecb03 100644
--- a/modules/custom/az_core/tests/src/Functional/ClearCacheTest.php
+++ b/modules/custom/az_core/tests/src/Functional/ClearCacheTest.php
@@ -3,12 +3,14 @@
 namespace Drupal\Tests\az_core\Functional;
 
 use Drupal\Core\Url;
+use PHPUnit\Framework\Attributes\Group;
+use PHPUnit\Framework\Attributes\RunTestsInSeparateProcesses;
 
 /**
  * Test to ensure the Quickstart settings clear cache button works correctly.
- *
- * @group az_core
  */
+#[Group('az_core')]
+#[RunTestsInSeparateProcesses]
 class ClearCacheTest extends QuickstartFunctionalTestBase {
 
   /**
diff --git a/modules/custom/az_core/tests/src/Functional/ConfigOverrideTest.php b/modules/custom/az_core/tests/src/Functional/ConfigOverrideTest.php
index 6c86fa6236..0eea4ab359 100644
--- a/modules/custom/az_core/tests/src/Functional/ConfigOverrideTest.php
+++ b/modules/custom/az_core/tests/src/Functional/ConfigOverrideTest.php
@@ -3,14 +3,14 @@
 namespace Drupal\Tests\az_core\Functional;
 
 use Drupal\Tests\BrowserTestBase;
+use PHPUnit\Framework\Attributes\Group;
+use PHPUnit\Framework\Attributes\RunTestsInSeparateProcesses;
 
 /**
  * Test to ensure Quickstart configuration overrides work correctly.
- *
- * @ingroup az_core
- *
- * @group az_core
  */
+#[Group('az_core')]
+#[RunTestsInSeparateProcesses]
 class ConfigOverrideTest extends BrowserTestBase {
 
   /**
diff --git a/modules/custom/az_core/tests/src/Functional/MonitoringPageTest.php b/modules/custom/az_core/tests/src/Functional/MonitoringPageTest.php
index f1c0a6f70e..a91afad984 100644
--- a/modules/custom/az_core/tests/src/Functional/MonitoringPageTest.php
+++ b/modules/custom/az_core/tests/src/Functional/MonitoringPageTest.php
@@ -3,12 +3,14 @@
 namespace Drupal\Tests\az_core\Functional;
 
 use Drupal\Core\Url;
+use PHPUnit\Framework\Attributes\Group;
+use PHPUnit\Framework\Attributes\RunTestsInSeparateProcesses;
 
 /**
  * Test to ensure that monitoring page works correctly.
- *
- * @group az_core
  */
+#[Group('az_core')]
+#[RunTestsInSeparateProcesses]
 class MonitoringPageTest extends QuickstartFunctionalTestBase {
 
   /**
diff --git a/modules/custom/az_core/tests/src/Unit/AZBootstrapMarkupConverterTest.php b/modules/custom/az_core/tests/src/Unit/AZBootstrapMarkupConverterTest.php
index dafddb441a..79f6d8efd9 100644
--- a/modules/custom/az_core/tests/src/Unit/AZBootstrapMarkupConverterTest.php
+++ b/modules/custom/az_core/tests/src/Unit/AZBootstrapMarkupConverterTest.php
@@ -4,19 +4,19 @@
 
 use Drupal\az_core\Utility\AZBootstrapMarkupConverter;
 use Drupal\Tests\UnitTestCase;
+use PHPUnit\Framework\Attributes\DataProvider;
+use PHPUnit\Framework\Attributes\Group;
 
 /**
  * Tests the AZ Bootstrap markup converter.
- *
- * @group az_core
  */
+#[Group('az_core')]
 class AZBootstrapMarkupConverterTest extends UnitTestCase {
 
   /**
    * Test fragments are converted correctly without adding document tags.
-   *
-   * @dataProvider provideFragments
    */
+  #[DataProvider('provideFragments')]
   public function testFragmentConversion($input, $expected) {
     $result = AZBootstrapMarkupConverter::convert($input);
     $this->assertEquals($expected, $result);
@@ -33,9 +33,8 @@ public function testCompareProcessorNoChanges() {
 
   /**
    * Test that compareProcessor returns converted text when changes are needed.
-   *
-   * @dataProvider provideFragments
    */
+  #[DataProvider('provideFragments')]
   public function testCompareProcessor($input, $expected) {
     $result = AZBootstrapMarkupConverter::compareProcessor($input);
     $this->assertEquals($expected, $result, 'Text with Bootstrap classes should be converted');
diff --git a/modules/custom/az_demo/tests/src/Functional/AZDemoContentTest.php b/modules/custom/az_demo/tests/src/Functional/AZDemoContentTest.php
index fe612d5a96..24846c271e 100644
--- a/modules/custom/az_demo/tests/src/Functional/AZDemoContentTest.php
+++ b/modules/custom/az_demo/tests/src/Functional/AZDemoContentTest.php
@@ -5,12 +5,14 @@
 use Drupal\Core\Url;
 use Drupal\Core\Config\FileStorage;
 use Drupal\Tests\az_core\Functional\QuickstartFunctionalTestBase;
+use PHPUnit\Framework\Attributes\Group;
+use PHPUnit\Framework\Attributes\RunTestsInSeparateProcesses;
 
 /**
  * Verify successful importing of demo content.
- *
- * @group az_demo
  */
+#[Group('az_demo')]
+#[RunTestsInSeparateProcesses]
 class AZDemoContentTest extends QuickstartFunctionalTestBase {
 
   /**
diff --git a/modules/custom/az_finder/tests/AZFinderIconsTest.php b/modules/custom/az_finder/tests/AZFinderIconsTest.php
index 9a46a66379..dabae9d19e 100644
--- a/modules/custom/az_finder/tests/AZFinderIconsTest.php
+++ b/modules/custom/az_finder/tests/AZFinderIconsTest.php
@@ -5,13 +5,13 @@
 namespace Drupal\Tests\az_finder\Unit;
 
 use Drupal\az_finder\Service\AZFinderIcons;
+use PHPUnit\Framework\Attributes\Group;
 use PHPUnit\Framework\TestCase;
 
 /**
  * Tests the AZFinderIcons class.
- *
- * @group az_finder
  */
+#[Group('az_finder')]
 class AZFinderIconsTest extends TestCase {
 
   /**
diff --git a/modules/custom/az_global_footer/tests/src/Functional/AzGlobalFooterTest.php b/modules/custom/az_global_footer/tests/src/Functional/AzGlobalFooterTest.php
index e0aff8c05d..8b1257edf7 100644
--- a/modules/custom/az_global_footer/tests/src/Functional/AzGlobalFooterTest.php
+++ b/modules/custom/az_global_footer/tests/src/Functional/AzGlobalFooterTest.php
@@ -3,12 +3,15 @@
 namespace Drupal\Tests\az_global_footer\Functional;
 
 use Drupal\Tests\BrowserTestBase;
+use PHPUnit\Framework\Attributes\DoesNotPerformAssertions;
+use PHPUnit\Framework\Attributes\Group;
+use PHPUnit\Framework\Attributes\RunTestsInSeparateProcesses;
 
 /**
  * Tests the Quickstart Global Footer.
- *
- * @group az_global_footer
  */
+#[Group('az_global_footer')]
+#[RunTestsInSeparateProcesses]
 class AzGlobalFooterTest extends BrowserTestBase {
 
   /**
@@ -32,9 +35,9 @@ class AzGlobalFooterTest extends BrowserTestBase {
 
   /**
    * Tests that the Quickstart Global Footer module can be uninstalled.
-   *
-   * @group regression
    */
+  #[Group('regression')]
+  #[DoesNotPerformAssertions]
   public function testIsUninstallableAndReinstallable() {
 
     // Uninstalls the az_global_footer module, so hook_modules_uninstalled()
diff --git a/modules/custom/az_migration/tests/src/Functional/MigrateExceptionsTest.php b/modules/custom/az_migration/tests/src/Functional/MigrateExceptionsTest.php
index cdd5141434..b5ccbcddbb 100644
--- a/modules/custom/az_migration/tests/src/Functional/MigrateExceptionsTest.php
+++ b/modules/custom/az_migration/tests/src/Functional/MigrateExceptionsTest.php
@@ -3,12 +3,14 @@
 namespace Drupal\Tests\az_migration\Functional;
 
 use Drupal\Tests\BrowserTestBase;
+use PHPUnit\Framework\Attributes\Group;
+use PHPUnit\Framework\Attributes\RunTestsInSeparateProcesses;
 
 /**
  * Tests the Quickstart Global Footer.
- *
- * @group az_global_footer
  */
+#[Group('az_global_footer')]
+#[RunTestsInSeparateProcesses]
 class MigrateExceptionsTest extends BrowserTestBase {
 
   /**
@@ -39,8 +41,6 @@ class MigrateExceptionsTest extends BrowserTestBase {
 
   /**
    * Tests that the Quickstart Global Footer module can be installed.
-   *
-   * @group regression
    */
   public function testGlobalFooterMigration() {
     // Install the az_global_footer module.
diff --git a/modules/custom/az_paragraphs/tests/src/Functional/AZParagraphsTest.php b/modules/custom/az_paragraphs/tests/src/Functional/AZParagraphsTest.php
index 9d9e91cb2c..cb2e79b2cb 100644
--- a/modules/custom/az_paragraphs/tests/src/Functional/AZParagraphsTest.php
+++ b/modules/custom/az_paragraphs/tests/src/Functional/AZParagraphsTest.php
@@ -3,14 +3,14 @@
 namespace Drupal\Tests\az_paragraphs\Functional;
 
 use Drupal\Tests\az_core\Functional\QuickstartFunctionalTestBase;
+use PHPUnit\Framework\Attributes\Group;
+use PHPUnit\Framework\Attributes\RunTestsInSeparateProcesses;
 
 /**
  * Run tests of paragraph bundles.
- *
- * @ingroup az_paragraphs
- *
- * @group az_paragraphs
  */
+#[Group('az_paragraphs')]
+#[RunTestsInSeparateProcesses]
 class AZParagraphsTest extends QuickstartFunctionalTestBase {
 
   /**
diff --git a/modules/custom/az_paragraphs/tests/src/FunctionalJavascript/AZParagraphsJavascriptTest.php b/modules/custom/az_paragraphs/tests/src/FunctionalJavascript/AZParagraphsJavascriptTest.php
index 979bdac761..e4d97c3da0 100644
--- a/modules/custom/az_paragraphs/tests/src/FunctionalJavascript/AZParagraphsJavascriptTest.php
+++ b/modules/custom/az_paragraphs/tests/src/FunctionalJavascript/AZParagraphsJavascriptTest.php
@@ -3,14 +3,18 @@
 namespace Drupal\Tests\az_paragraphs\FunctionalJavascript;
 
 use Drupal\Tests\az_core\FunctionalJavascript\QuickstartFunctionalJavascriptTestBase;
+use PHPUnit\Framework\Attributes\Group;
+use PHPUnit\Framework\Attributes\IgnoreDeprecations;
+use PHPUnit\Framework\Attributes\IgnorePhpunitDeprecations;
+use PHPUnit\Framework\Attributes\RunTestsInSeparateProcesses;
 
 /**
  * Run tests of paragraph bundles.
- *
- * @ingroup az_paragraphs_js
- *
- * @group az_paragraphs_js
  */
+#[Group('az_paragraphs_js')]
+#[IgnoreDeprecations]
+#[IgnorePhpunitDeprecations]
+#[RunTestsInSeparateProcesses]
 class AZParagraphsJavascriptTest extends QuickstartFunctionalJavascriptTestBase {
 
   /**
diff --git a/modules/custom/az_paragraphs/tests/src/Unit/AZVideoEmbedHelperTest.php b/modules/custom/az_paragraphs/tests/src/Unit/AZVideoEmbedHelperTest.php
index 73388239ab..057d09b8a1 100644
--- a/modules/custom/az_paragraphs/tests/src/Unit/AZVideoEmbedHelperTest.php
+++ b/modules/custom/az_paragraphs/tests/src/Unit/AZVideoEmbedHelperTest.php
@@ -4,14 +4,15 @@
 
 use Drupal\Tests\UnitTestCase;
 use Drupal\az_paragraphs\AZVideoEmbedHelper;
+use PHPUnit\Framework\Attributes\CoversClass;
+use PHPUnit\Framework\Attributes\DataProvider;
+use PHPUnit\Framework\Attributes\Group;
 
 /**
- * @coversDefaultClass \Drupal\az_paragraphs\AZVideoEmbedHelper
- *
- * @ingroup az_paragraphs
- *
- * @group az_paragraphs
+ * Test coverage for AZVideoEmbedHelper class.
  */
+#[CoversClass(AZVideoEmbedHelper::class)]
+#[Group('az_paragraphs')]
 class AZVideoEmbedHelperTest extends UnitTestCase {
 
   /**
@@ -29,11 +30,8 @@ protected function setUp(): void {
 
   /**
    * Tests parsing of YouTube video ID from URLs.
-   *
-   * @covers ::getYoutubeIdFromUrl
-   *
-   * @dataProvider providerYouTubeVideoData
    */
+  #[DataProvider('providerYouTubeVideoData')]
   public function testGetYoutubeIdFromUrl($youtube_url, $expected_id) {
     $this->assertEquals($expected_id, $this->videoEmbedHelper->getYoutubeIdFromUrl($youtube_url));
   }
diff --git a/modules/custom/az_publication/tests/src/FunctionalJavascript/AZPublicationInlineContributorTest.php b/modules/custom/az_publication/tests/src/FunctionalJavascript/AZPublicationInlineContributorTest.php
index 05cda80308..4d8f1632c8 100644
--- a/modules/custom/az_publication/tests/src/FunctionalJavascript/AZPublicationInlineContributorTest.php
+++ b/modules/custom/az_publication/tests/src/FunctionalJavascript/AZPublicationInlineContributorTest.php
@@ -3,14 +3,18 @@
 namespace Drupal\Tests\az_publication\FunctionalJavascript;
 
 use Drupal\Tests\az_core\FunctionalJavascript\QuickstartFunctionalJavascriptTestBase;
+use PHPUnit\Framework\Attributes\Group;
+use PHPUnit\Framework\Attributes\IgnoreDeprecations;
+use PHPUnit\Framework\Attributes\IgnorePhpunitDeprecations;
+use PHPUnit\Framework\Attributes\RunTestsInSeparateProcesses;
 
 /**
  * Run tests of publication contributor role functionality.
- *
- * @ingroup az_publication
- *
- * @group az_publication
  */
+#[Group('az_publication')]
+#[IgnoreDeprecations]
+#[IgnorePhpunitDeprecations]
+#[RunTestsInSeparateProcesses]
 class AZPublicationInlineContributorTest extends QuickstartFunctionalJavascriptTestBase {
 
   /**
diff --git a/modules/custom/az_select_menu/tests/src/Functional/AzSelectMenuTest.php b/modules/custom/az_select_menu/tests/src/Functional/AzSelectMenuTest.php
index 2be7902a00..bbca30096a 100644
--- a/modules/custom/az_select_menu/tests/src/Functional/AzSelectMenuTest.php
+++ b/modules/custom/az_select_menu/tests/src/Functional/AzSelectMenuTest.php
@@ -3,12 +3,15 @@
 namespace Drupal\Tests\az_select_menu\Functional;
 
 use Drupal\Tests\BrowserTestBase;
+use PHPUnit\Framework\Attributes\DoesNotPerformAssertions;
+use PHPUnit\Framework\Attributes\Group;
+use PHPUnit\Framework\Attributes\RunTestsInSeparateProcesses;
 
 /**
  * Tests the Quickstart select menu block.
- *
- * @group az_select_menu
  */
+#[Group('az_select_menu')]
+#[RunTestsInSeparateProcesses]
 class AzSelectMenuTest extends BrowserTestBase {
 
   /**
@@ -32,9 +35,8 @@ class AzSelectMenuTest extends BrowserTestBase {
 
   /**
    * Tests that the Quickstart Select Menu Block module can be uninstalled.
-   *
-   * @group az_select_menu
    */
+  #[DoesNotPerformAssertions]
   public function testIsUninstallableAndReinstallable() {
 
     // Uninstalls the az_select_menu module, so hook_modules_uninstalled()
diff --git a/phpunit.xml.dist b/phpunit.xml.dist
index 5da264db22..8e2bf38a27 100644
--- a/phpunit.xml.dist
+++ b/phpunit.xml.dist
@@ -5,11 +5,14 @@
          beStrictAboutTestsThatDoNotTestAnything="true"
          beStrictAboutOutputDuringTests="true"
          beStrictAboutChangesToGlobalState="true"
-         failOnRisky="false"
-         failOnWarning="false"
+         failOnRisky="true"
+         failOnWarning="true"
+         failOnDeprecation="true"
+         failOnPhpunitDeprecation="false"
          displayDetailsOnTestsThatTriggerErrors="true"
          displayDetailsOnTestsThatTriggerWarnings="true"
          displayDetailsOnTestsThatTriggerDeprecations="true"
+         displayDetailsOnPhpunitDeprecations="true"
          cacheResult="false"
          xsi:noNamespaceSchemaLocation="https://schema.phpunit.de/10.5/phpunit.xsd"
          cacheDirectory=".phpunit.cache">
diff --git a/themes/custom/az_barrio/tests/src/Functional/AzBarrioAdminTest.php b/themes/custom/az_barrio/tests/src/Functional/AzBarrioAdminTest.php
index dfb76b5d98..f3484bffe0 100644
--- a/themes/custom/az_barrio/tests/src/Functional/AzBarrioAdminTest.php
+++ b/themes/custom/az_barrio/tests/src/Functional/AzBarrioAdminTest.php
@@ -3,12 +3,14 @@
 namespace Drupal\Tests\az_barrio\Functional;
 
 use Drupal\Tests\az_core\Functional\QuickstartFunctionalTestBase;
+use PHPUnit\Framework\Attributes\Group;
+use PHPUnit\Framework\Attributes\RunTestsInSeparateProcesses;
 
 /**
  * Tests the Arizona Barrio theme as an admin user.
- *
- * @group az_barrio
  */
+#[Group('az_barrio')]
+#[RunTestsInSeparateProcesses]
 class AzBarrioAdminTest extends QuickstartFunctionalTestBase {
 
   /**
diff --git a/themes/custom/az_barrio/tests/src/Functional/AzBarrioTest.php b/themes/custom/az_barrio/tests/src/Functional/AzBarrioTest.php
index c542cf684f..8dc04c49c7 100644
--- a/themes/custom/az_barrio/tests/src/Functional/AzBarrioTest.php
+++ b/themes/custom/az_barrio/tests/src/Functional/AzBarrioTest.php
@@ -3,12 +3,14 @@
 namespace Drupal\Tests\az_barrio\Functional;
 
 use Drupal\Tests\az_core\Functional\QuickstartFunctionalTestBase;
+use PHPUnit\Framework\Attributes\Group;
+use PHPUnit\Framework\Attributes\RunTestsInSeparateProcesses;
 
 /**
  * Tests the Arizona Barrio theme.
- *
- * @group az_barrio
  */
+#[Group('az_barrio')]
+#[RunTestsInSeparateProcesses]
 class AzBarrioTest extends QuickstartFunctionalTestBase {
 
   /**