reverted:
--- b/tests/src/Functional/JsonSchemaValidatorConfigurationFormTest.php
+++ a/tests/src/Functional/JsonSchemaValidatorConfigurationFormTest.php
@@ -4,8 +4,6 @@
 
 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;
 
@@ -14,8 +12,6 @@
  *
  * @group json_schema_validator
  */
-#[Group('json_schema_validator')]
-#[RunTestsInSeparateProcesses]
 final class JsonSchemaValidatorConfigurationFormTest extends BrowserTestBase {
 
   /**
reverted:
--- b/tests/src/Kernel/JsonSchemaValidatorDefaultsTest.php
+++ a/tests/src/Kernel/JsonSchemaValidatorDefaultsTest.php
@@ -4,8 +4,6 @@
 
 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;
@@ -18,8 +16,6 @@
  *
  * @group json_schema_validator
  */
-#[Group('json_schema_validator')]
-#[RunTestsInSeparateProcesses]
 final class JsonSchemaValidatorDefaultsTest extends KernelTestBase {
 
   /**
reverted:
--- b/tests/src/Kernel/JsonSchemaValidatorInstallTest.php
+++ a/tests/src/Kernel/JsonSchemaValidatorInstallTest.php
@@ -4,8 +4,6 @@
 
 namespace Drupal\Tests\json_schema_validator\Kernel;
 
-use PHPUnit\Framework\Attributes\Group;
-use PHPUnit\Framework\Attributes\RunTestsInSeparateProcesses;
 use Drupal\KernelTests\KernelTestBase;
 
 /**
@@ -13,8 +11,6 @@
  *
  * @group json_schema_validator
  */
-#[Group('json_schema_validator')]
-#[RunTestsInSeparateProcesses]
 class JsonSchemaValidatorInstallTest extends KernelTestBase {
 
   private const string MODULE_NAME = 'json_schema_validator';
reverted:
--- b/tests/src/Kernel/JsonSchemaValidatorTest.php
+++ a/tests/src/Kernel/JsonSchemaValidatorTest.php
@@ -4,8 +4,6 @@
 
 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;
@@ -21,8 +19,6 @@
  *
  * @group json_schema_validator
  */
-#[Group('json_schema_validator')]
-#[RunTestsInSeparateProcesses]
 final class JsonSchemaValidatorTest extends KernelTestBase {
 
   /**
reverted:
--- b/tests/src/Kernel/YamlJsonSchemaValidatorTest.php
+++ a/tests/src/Kernel/YamlJsonSchemaValidatorTest.php
@@ -4,8 +4,6 @@
 
 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;
@@ -19,8 +17,6 @@
  *
  * @group json_schema_validator
  */
-#[Group('json_schema_validator')]
-#[RunTestsInSeparateProcesses]
 final class YamlJsonSchemaValidatorTest extends KernelTestBase {
 
   /**
reverted:
--- b/tests/src/Unit/Form/JsonSchemaValidatorConfigurationFormValidateTest.php
+++ a/tests/src/Unit/Form/JsonSchemaValidatorConfigurationFormValidateTest.php
@@ -4,7 +4,6 @@
 
 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;
@@ -19,7 +18,6 @@
  *
  * @coversDefaultClass \Drupal\json_schema_validator\Form\JsonSchemaValidatorConfigurationForm
  */
-#[Group('json_schema_validator')]
 final class JsonSchemaValidatorConfigurationFormValidateTest extends UnitTestCase {
 
   /**
only in patch2:
unchanged:
--- a/json_schema_validator.info.yml
+++ b/json_schema_validator.info.yml
@@ -1,4 +1,4 @@
 name: JSON Schema Validator
 type: module
 description: 'Validates JSON against a developer-provided JSON schema'
-core_version_requirement: ^10 || ^11
+core_version_requirement: ^10 || ^11 || ^12