diff --git a/tests/src/Functional/JsonSchemaValidatorConfigurationFormTest.php b/tests/src/Functional/JsonSchemaValidatorConfigurationFormTest.php
index 21d2c18..b8c30d9 100644
--- a/tests/src/Functional/JsonSchemaValidatorConfigurationFormTest.php
+++ b/tests/src/Functional/JsonSchemaValidatorConfigurationFormTest.php
@@ -4,6 +4,8 @@ declare(strict_types=1);
 
 namespace Drupal\Tests\json_schema_validator\Functional;
 
+use PHPUnit\Framework\Attributes\Group;
+use PHPUnit\Framework\Attributes\RunTestsInSeparateProcesses;
 use Drupal\Tests\BrowserTestBase;
 use Drupal\json_schema_validator\Enum\JsonSchemaValidatorConfig;
 
@@ -12,6 +14,8 @@ use Drupal\json_schema_validator\Enum\JsonSchemaValidatorConfig;
  *
  * @group json_schema_validator
  */
+#[Group('json_schema_validator')]
+#[RunTestsInSeparateProcesses]
 final class JsonSchemaValidatorConfigurationFormTest extends BrowserTestBase {
 
   /**
diff --git a/tests/src/Kernel/JsonSchemaValidatorDefaultsTest.php b/tests/src/Kernel/JsonSchemaValidatorDefaultsTest.php
index eead34c..7966993 100644
--- a/tests/src/Kernel/JsonSchemaValidatorDefaultsTest.php
+++ b/tests/src/Kernel/JsonSchemaValidatorDefaultsTest.php
@@ -4,6 +4,8 @@ declare(strict_types=1);
 
 namespace Drupal\Tests\json_schema_validator\Kernel;
 
+use PHPUnit\Framework\Attributes\Group;
+use PHPUnit\Framework\Attributes\RunTestsInSeparateProcesses;
 use Drupal\Core\Logger\RfcLogLevel;
 use Drupal\KernelTests\KernelTestBase;
 use Drupal\json_schema_validator\Enum\JsonSchemaValidatorConfig;
@@ -16,6 +18,8 @@ use Drupal\json_schema_validator\JsonSchemaValidator;
  *
  * @group json_schema_validator
  */
+#[Group('json_schema_validator')]
+#[RunTestsInSeparateProcesses]
 final class JsonSchemaValidatorDefaultsTest extends KernelTestBase {
 
   /**
diff --git a/tests/src/Kernel/JsonSchemaValidatorInstallTest.php b/tests/src/Kernel/JsonSchemaValidatorInstallTest.php
index 215097d..d777d10 100644
--- a/tests/src/Kernel/JsonSchemaValidatorInstallTest.php
+++ b/tests/src/Kernel/JsonSchemaValidatorInstallTest.php
@@ -4,6 +4,8 @@ declare(strict_types=1);
 
 namespace Drupal\Tests\json_schema_validator\Kernel;
 
+use PHPUnit\Framework\Attributes\Group;
+use PHPUnit\Framework\Attributes\RunTestsInSeparateProcesses;
 use Drupal\KernelTests\KernelTestBase;
 
 /**
@@ -11,6 +13,8 @@ use Drupal\KernelTests\KernelTestBase;
  *
  * @group json_schema_validator
  */
+#[Group('json_schema_validator')]
+#[RunTestsInSeparateProcesses]
 class JsonSchemaValidatorInstallTest extends KernelTestBase {
 
   private const string MODULE_NAME = 'json_schema_validator';
diff --git a/tests/src/Kernel/JsonSchemaValidatorTest.php b/tests/src/Kernel/JsonSchemaValidatorTest.php
index 31cf123..10e9bd2 100644
--- a/tests/src/Kernel/JsonSchemaValidatorTest.php
+++ b/tests/src/Kernel/JsonSchemaValidatorTest.php
@@ -4,6 +4,8 @@ declare(strict_types=1);
 
 namespace Drupal\Tests\json_schema_validator\Kernel;
 
+use PHPUnit\Framework\Attributes\Group;
+use PHPUnit\Framework\Attributes\RunTestsInSeparateProcesses;
 use Drupal\Core\Logger\LoggerChannelFactoryInterface;
 use Drupal\KernelTests\KernelTestBase;
 use Drupal\json_schema_validator\Enum\JsonSchemaValidatorConfig;
@@ -19,6 +21,8 @@ use Psr\Log\LoggerTrait;
  *
  * @group json_schema_validator
  */
+#[Group('json_schema_validator')]
+#[RunTestsInSeparateProcesses]
 final class JsonSchemaValidatorTest extends KernelTestBase {
 
   /**
diff --git a/tests/src/Kernel/YamlJsonSchemaValidatorTest.php b/tests/src/Kernel/YamlJsonSchemaValidatorTest.php
index cbb2fe9..3787a2a 100644
--- a/tests/src/Kernel/YamlJsonSchemaValidatorTest.php
+++ b/tests/src/Kernel/YamlJsonSchemaValidatorTest.php
@@ -4,6 +4,8 @@ declare(strict_types=1);
 
 namespace Drupal\Tests\json_schema_validator\Kernel;
 
+use PHPUnit\Framework\Attributes\Group;
+use PHPUnit\Framework\Attributes\RunTestsInSeparateProcesses;
 use Drupal\KernelTests\KernelTestBase;
 use Drupal\json_schema_validator\Enum\JsonSchemaValidatorConfig;
 use Drupal\json_schema_validator\Exception\JsonSchemaValidatorInvalidJsonException;
@@ -17,6 +19,8 @@ use Drupal\json_schema_validator\YamlJsonSchemaValidator;
  *
  * @group json_schema_validator
  */
+#[Group('json_schema_validator')]
+#[RunTestsInSeparateProcesses]
 final class YamlJsonSchemaValidatorTest extends KernelTestBase {
 
   /**
diff --git a/tests/src/Unit/Form/JsonSchemaValidatorConfigurationFormValidateTest.php b/tests/src/Unit/Form/JsonSchemaValidatorConfigurationFormValidateTest.php
index bccd668..a0d22b7 100644
--- a/tests/src/Unit/Form/JsonSchemaValidatorConfigurationFormValidateTest.php
+++ b/tests/src/Unit/Form/JsonSchemaValidatorConfigurationFormValidateTest.php
@@ -4,6 +4,7 @@ declare(strict_types=1);
 
 namespace Drupal\Tests\json_schema_validator\Unit\Form;
 
+use PHPUnit\Framework\Attributes\Group;
 use Drupal\Core\Config\ConfigFactoryInterface;
 use Drupal\Core\Config\TypedConfigManagerInterface;
 use Drupal\Core\Form\FormStateInterface;
@@ -18,6 +19,7 @@ use Drupal\json_schema_validator\Form\JsonSchemaValidatorConfigurationForm;
  *
  * @coversDefaultClass \Drupal\json_schema_validator\Form\JsonSchemaValidatorConfigurationForm
  */
+#[Group('json_schema_validator')]
 final class JsonSchemaValidatorConfigurationFormValidateTest extends UnitTestCase {
 
   /**