diff --git a/composer.json b/composer.json
index a8e139f..126ffba 100644
--- a/composer.json
+++ b/composer.json
@@ -11,8 +11,8 @@
     ],
     "require": {
         "php": "^8.4",
-        "doctrine/orm": "^3.6",
-        "doctrine/doctrine-laminas-hydrator": "^3.7",
+        "doctrine/orm": "^2.20.9 || ^3.0",
+        "doctrine/doctrine-laminas-hydrator": "^3.2",
         "webonyx/graphql-php": "^v15.29",
         "psr/container": "^2.0",
         "league/event": "^3.0",
@@ -20,12 +20,20 @@
     },
     "require-dev": {
         "doctrine/coding-standard": "^14.0",
-        "doctrine/dbal": "^4.0",
+        "doctrine/dbal": "^3.1 || ^4.0",
         "phpunit/phpunit": "^13.0",
-        "vimeo/psalm": "^6.14",
+        "vimeo/psalm": "^6.16.1",
         "symfony/cache": "^7.0 || ^8.0",
-        "php-parallel-lint/php-parallel-lint": "^1.3.2",
-        "phpstan/phpstan": "^2.1"
+        "php-parallel-lint/php-parallel-lint": "^1.4",
+        "phpstan/phpstan": "^2.1.51",
+        "amphp/dns": "^v2.4",
+        "amphp/socket": "^v2.4",
+        "amphp/cache": "^v2.0.1",
+        "amphp/parser": "^v1.1.1",
+        "amphp/process": "^v2.0.3",
+        "symfony/console": "^8.0",
+        "spatie/array-to-xml": "^3.4.4",
+        "daverandom/libdns": "^2.1"
     },
     "suggest": {
         "ramsey/uuid-doctrine": "Support for an UUID Doctrine type"
diff --git a/test/TestCase.php b/test/TestCase.php
index 4f1eeaa..a339ade 100644
--- a/test/TestCase.php
+++ b/test/TestCase.php
@@ -15,6 +15,7 @@
 use function count;
 use function date;
 use function file_get_contents;
+use function method_exists;
 
 require_once __DIR__ . '/../vendor/autoload.php';
 
@@ -29,7 +30,9 @@ public function setUp(): void
             paths: [__DIR__ . '/Entity'],
             isDevMode: true,
         );
-        $config->enableNativeLazyObjects(true);
+        if (method_exists($config, 'enableNativeLazyObjects')) {
+            $config->enableNativeLazyObjects(true);
+        }
 
         // database connection
         $connection = DriverManager::getConnection([
diff --git a/test/Unit/Hydrator/DoctrineObjectWithComputedTest.php b/test/Unit/Hydrator/DoctrineObjectWithComputedTest.php
index 19257b4..68b679f 100644
--- a/test/Unit/Hydrator/DoctrineObjectWithComputedTest.php
+++ b/test/Unit/Hydrator/DoctrineObjectWithComputedTest.php
@@ -5,9 +5,8 @@
 namespace ApiSkeletonsTest\Doctrine\ORM\GraphQL\Unit\Hydrator;
 
 use ApiSkeletons\Doctrine\ORM\GraphQL\Hydrator\DoctrineObjectWithComputed;
-use Doctrine\ORM\EntityManager;
-use PHPUnit\Framework\TestCase;
-use stdClass;
+use ApiSkeletonsTest\Doctrine\ORM\GraphQL\Entity\Artist;
+use ApiSkeletonsTest\Doctrine\ORM\GraphQL\TestCase;
 
 use function strlen;
 use function strtoupper;
@@ -16,13 +15,11 @@ class DoctrineObjectWithComputedTest extends TestCase
 {
     private DoctrineObjectWithComputed $hydrator;
 
-    protected function setUp(): void
+    public function setUp(): void
     {
-        // Create a stub entity manager for testing (not used by the hydrator methods we're testing)
-        $entityManager = $this->createStub(EntityManager::class);
+        parent::setUp();
 
-        // DoctrineObjectWithComputed extends DoctrineObject which takes EntityManager and byValue flag
-        $this->hydrator = new DoctrineObjectWithComputed($entityManager, false);
+        $this->hydrator = new DoctrineObjectWithComputed($this->getEntityManager(), false);
     }
 
     public function testHasComputedFieldReturnsFalseWhenNotRegistered(): void
@@ -58,19 +55,19 @@ public function testGetComputedFieldNamesReturnsAllRegisteredFields(): void
 
     public function testExtractIncludesComputedFields(): void
     {
-        $entity       = new stdClass();
-        $entity->name = 'Test Name';
+        $artist = $this->getEntityManager()
+            ->getRepository(Artist::class)
+            ->findOneBy(['name' => 'Grateful Dead']);
 
-        // Add computed field that transforms the name
-        $this->hydrator->addComputedField('uppercaseName', static fn ($obj) => strtoupper($obj->name));
-        $this->hydrator->addComputedField('nameLength', static fn ($obj) => strlen($obj->name));
+        $this->hydrator->addComputedField('uppercaseName', static fn ($obj) => strtoupper($obj->getName()));
+        $this->hydrator->addComputedField('nameLength', static fn ($obj) => strlen($obj->getName()));
 
-        $result = $this->hydrator->extract($entity);
+        $result = $this->hydrator->extract($artist);
 
         $this->assertArrayHasKey('uppercaseName', $result);
         $this->assertArrayHasKey('nameLength', $result);
-        $this->assertEquals('TEST NAME', $result['uppercaseName']);
-        $this->assertEquals(9, $result['nameLength']);
+        $this->assertEquals('GRATEFUL DEAD', $result['uppercaseName']);
+        $this->assertEquals(13, $result['nameLength']);
     }
 
     public function testAddComputedFieldAllowsMultipleFields(): void