diff --git a/composer.json b/composer.json
index 3e333caa..d47e5e9e 100644
--- a/composer.json
+++ b/composer.json
@@ -29,7 +29,7 @@
         "doctrine/doctrine-bundle": "^2.11",
         "doctrine/doctrine-fixtures-bundle": "^3.5.1 || ^4.0",
         "doctrine/mongodb-odm-bundle": "^4.4 || ^5.0",
-        "doctrine/orm": "^2.7",
+        "doctrine/orm": "^2.14 || ^3.0",
         "doctrine/mongodb-odm": "^2.5",
         "monolog/monolog": "^1.25.1 || ^2.0 || ^3.0",
         "phpunit/phpunit": "^10.5.11 || ^11.0.4",
@@ -42,7 +42,7 @@
         "doctrine/annotations": "<1.13.1 || >=3.0",
         "doctrine/dbal": "<2.13.1 || ~3.0.0 || >=4.0",
         "doctrine/mongodb-odm": "<2.2 || >=3.0",
-        "doctrine/orm": "<2.14 || >=3.0"
+        "doctrine/orm": "<2.14 || >=4.0"
     },
     "suggest": {
         "doctrine/dbal": "Required when using the fixture loading functionality with an ORM and SQLite",
diff --git a/doc/contributing.md b/doc/contributing.md
index 7607992c..c8c133b1 100644
--- a/doc/contributing.md
+++ b/doc/contributing.md
@@ -36,6 +36,18 @@ If one test fails, run it without the `--process-isolation` option
 docker-compose exec php-fpm ./vendor/bin/phpunit tests/Test/ConfigMongodbTest.php
 ```
 
+You can also use the `--filter` option to run tests matching a class and name:
+
+```bash
+docker-compose exec php-fpm ./vendor/bin/phpunit --process-isolation --filter=ConfigSqliteTest::testAppendFixtures
+```
+
+You can also use the `--filter` option to run tests matching a name:
+
+```bash
+docker-compose exec php-fpm ./vendor/bin/phpunit --process-isolation --filter=testAppendFixtures
+```
+
 ## Delete the cache
 
 If you change the version of PHP or dependencies, the caches may cause issues, they can be deleted:
diff --git a/tests/App/DataFixtures/ORM/LoadDependentUserData.php b/tests/App/DataFixtures/ORM/LoadDependentUserData.php
index c866cd76..9da78c7e 100644
--- a/tests/App/DataFixtures/ORM/LoadDependentUserData.php
+++ b/tests/App/DataFixtures/ORM/LoadDependentUserData.php
@@ -22,17 +22,18 @@ class LoadDependentUserData extends AbstractFixture implements DependentFixtureI
 {
     public function load(ObjectManager $manager): void
     {
-        /** @var User $user */
-        $user = clone $this->getReference('user');
-
+        $user = new User();
         $user->setId(3);
+        $user->setName('alice bar');
+        $user->setEmail('alice@bar.com');
 
         $manager->persist($user);
         $manager->flush();
 
-        $user = clone $this->getReference('user');
-
+        $user = new User();
         $user->setId(4);
+        $user->setName('eve bar');
+        $user->setEmail('eve@bar.com');
 
         $manager->persist($user);
         $manager->flush();
diff --git a/tests/App/DataFixtures/ORM/LoadDependentUserWithServiceData.php b/tests/App/DataFixtures/ORM/LoadDependentUserWithServiceData.php
index a0e36061..caff769f 100644
--- a/tests/App/DataFixtures/ORM/LoadDependentUserWithServiceData.php
+++ b/tests/App/DataFixtures/ORM/LoadDependentUserWithServiceData.php
@@ -31,18 +31,19 @@ public function __construct(DummyService $dummyService)
 
     public function load(ObjectManager $manager): void
     {
-        /** @var User $user */
-        $user = clone $this->getReference('serviceUser');
-
+        $user = new User();
         $user->setId(3);
+        $user->setName('alice bar');
+        $user->setEmail('alice@bar.com');
         $user->setDummyText($this->dummyService->getText());
 
         $manager->persist($user);
         $manager->flush();
 
-        $user = clone $this->getReference('serviceUser');
-
+        $user = new User();
         $user->setId(4);
+        $user->setName('eve bar');
+        $user->setEmail('eve@bar.com');
 
         $manager->persist($user);
         $manager->flush();
diff --git a/tests/App/DataFixtures/ORM/LoadSecondUserData.php b/tests/App/DataFixtures/ORM/LoadSecondUserData.php
index 6e76f556..afa15472 100644
--- a/tests/App/DataFixtures/ORM/LoadSecondUserData.php
+++ b/tests/App/DataFixtures/ORM/LoadSecondUserData.php
@@ -22,8 +22,9 @@ class LoadSecondUserData extends AbstractFixture
     public function load(ObjectManager $manager): void
     {
         $user = new User();
-        $user->setName('bar foo');
-        $user->setEmail('bar@foo.com');
+        $user->setId(3);
+        $user->setName('alice bar');
+        $user->setEmail('alice@bar.com');
 
         $manager->persist($user);
         $manager->flush();
diff --git a/tests/App/DataFixtures/ORM/LoadUserData.php b/tests/App/DataFixtures/ORM/LoadUserData.php
index 59b30983..c440d5ed 100644
--- a/tests/App/DataFixtures/ORM/LoadUserData.php
+++ b/tests/App/DataFixtures/ORM/LoadUserData.php
@@ -31,9 +31,10 @@ public function load(ObjectManager $manager): void
 
         $this->addReference('user', $user);
 
-        $user = clone $this->getReference('user');
-
+        $user = new User();
         $user->setId(2);
+        $user->setName('bob bar');
+        $user->setEmail('bob@bar.com');
 
         $manager->persist($user);
         $manager->flush();
diff --git a/tests/App/DataFixtures/ORM/LoadUserDataInGroup.php b/tests/App/DataFixtures/ORM/LoadUserDataInGroup.php
index 9baf023b..63bfa9f6 100644
--- a/tests/App/DataFixtures/ORM/LoadUserDataInGroup.php
+++ b/tests/App/DataFixtures/ORM/LoadUserDataInGroup.php
@@ -33,18 +33,18 @@ public function load(ObjectManager $manager): void
         $manager->persist($user);
         $manager->flush();
 
-        $this->addReference('groupUser', $user);
-
-        $user = clone $this->getReference('groupUser');
-
+        $user = new User();
         $user->setId(2);
+        $user->setName('bob bar');
+        $user->setEmail('bob@bar.com');
 
         $manager->persist($user);
         $manager->flush();
 
-        $user = clone $this->getReference('groupUser');
-
+        $user = new User();
         $user->setId(3);
+        $user->setName('alice bar');
+        $user->setEmail('alice@bar.com');
 
         $manager->persist($user);
         $manager->flush();
diff --git a/tests/App/DataFixtures/ORM/LoadUserWithServiceData.php b/tests/App/DataFixtures/ORM/LoadUserWithServiceData.php
index 0ef66829..9c42803d 100644
--- a/tests/App/DataFixtures/ORM/LoadUserWithServiceData.php
+++ b/tests/App/DataFixtures/ORM/LoadUserWithServiceData.php
@@ -42,11 +42,10 @@ public function load(ObjectManager $manager): void
         $manager->persist($user);
         $manager->flush();
 
-        $this->addReference('serviceUser', $user);
-
-        $user = clone $this->getReference('serviceUser');
-
+        $user = new User();
         $user->setId(2);
+        $user->setName('bob bar');
+        $user->setEmail('bob@bar.com');
 
         $manager->persist($user);
         $manager->flush();
diff --git a/tests/App/DataFixtures/ORM/user.yml b/tests/App/DataFixtures/ORM/user.yml
index 83a84573..ad0bf96d 100644
--- a/tests/App/DataFixtures/ORM/user.yml
+++ b/tests/App/DataFixtures/ORM/user.yml
@@ -1,4 +1,5 @@
 Liip\Acme\Tests\App\Entity\User:
-    id{1..10}:
+    user_id_{1..10}:
+        id: <current()>
         name: <name()>
         email: <email()>
diff --git a/tests/App/DataFixtures/ORM/user_with_custom_provider.yml b/tests/App/DataFixtures/ORM/user_with_custom_provider.yml
index ac10e2f3..1fe7ab66 100644
--- a/tests/App/DataFixtures/ORM/user_with_custom_provider.yml
+++ b/tests/App/DataFixtures/ORM/user_with_custom_provider.yml
@@ -1,4 +1,5 @@
 Liip\Acme\Tests\App\Entity\User:
-    id{1..10}:
+    custom_user_id_{11..20}:
+        id: <current()>
         name: <foo('a string')>
         email: <email()>
diff --git a/tests/Test/ConfigMysqlTest.php b/tests/Test/ConfigMysqlTest.php
index e7b055a9..9acf6d60 100644
--- a/tests/Test/ConfigMysqlTest.php
+++ b/tests/Test/ConfigMysqlTest.php
@@ -74,7 +74,7 @@ public function testLoadEmptyFixtures(): void
         );
     }
 
-    public function testLoadFixtures(int $firstUserId = 1): void
+    public function testLoadFixtures(): void
     {
         $fixtures = $this->databaseTool->loadFixtures([
             'Liip\Acme\Tests\App\DataFixtures\ORM\LoadUserData',
@@ -111,7 +111,7 @@ public function testLoadFixtures(int $firstUserId = 1): void
         );
     }
 
-    public function testAppendFixtures(int $firstUserId = 1, int $thirdUserId = 3): void
+    public function testAppendFixtures(): void
     {
         $this->databaseTool->loadFixtures([
             'Liip\Acme\Tests\App\DataFixtures\ORM\LoadUserData',
@@ -145,17 +145,31 @@ public function testAppendFixtures(int $firstUserId = 1, int $thirdUserId = 3):
             $user1->getEmail()
         );
 
-        /** @var User $user */
+        /** @var User $user2 */
+        $user2 = $this->userRepository
+            ->findOneBy([
+                'email' => 'alice@bar.com',
+            ])
+        ;
+
+        $this->assertNotNull($user2);
+
+        $this->assertSame(
+            'alice@bar.com',
+            $user2->getEmail()
+        );
+
+        /** @var User $user3 */
         $user3 = $this->userRepository
             ->findOneBy([
-                'email' => 'bar@foo.com',
+                'email' => 'alice@bar.com',
             ])
         ;
 
         $this->assertNotNull($user3);
 
         $this->assertSame(
-            'bar@foo.com',
+            'alice@bar.com',
             $user3->getEmail()
         );
     }
@@ -236,6 +250,8 @@ public function testLoadFixturesAndPurge(): void
             $users
         );
 
+        $this->getTestContainer()->get('doctrine')->getManager()->clear();
+
         // Reload fixtures
         $this->databaseTool->loadFixtures([
             'Liip\Acme\Tests\App\DataFixtures\ORM\LoadUserData',
@@ -303,6 +319,29 @@ public function testLoadFixturesFiles(): void
         $this->assertInstanceOf(User::class, $user);
     }
 
+    /**
+     * Load fixture which has a dependency.
+     */
+    public function testLoadDependentFixtures(): void
+    {
+        $fixtures = $this->databaseTool->loadFixtures([
+            'Liip\Acme\Tests\App\DataFixtures\ORM\LoadDependentUserData',
+        ]);
+
+        $this->assertInstanceOf(
+            'Doctrine\Common\DataFixtures\Executor\ORMExecutor',
+            $fixtures
+        );
+
+        $users = $this->userRepository->findAll();
+
+        // The two files with fixtures have been loaded, there are 4 users.
+        $this->assertCount(
+            4,
+            $users
+        );
+    }
+
     protected static function getKernelClass(): string
     {
         return AppConfigMysqlKernel::class;
diff --git a/tests/Test/ConfigPgsqlTest.php b/tests/Test/ConfigPgsqlTest.php
index 0d8f1853..4c7f3509 100644
--- a/tests/Test/ConfigPgsqlTest.php
+++ b/tests/Test/ConfigPgsqlTest.php
@@ -34,6 +34,29 @@
 #[PreserveGlobalState(false)]
 class ConfigPgsqlTest extends ConfigMysqlTest
 {
+    /**
+     * Load fixture which has a dependency.
+     */
+    public function testLoadDependentFixtures(): void
+    {
+        $fixtures = $this->databaseTool->loadFixtures([
+            'Liip\Acme\Tests\App\DataFixtures\ORM\LoadDependentUserData',
+        ]);
+
+        $this->assertInstanceOf(
+            'Doctrine\Common\DataFixtures\Executor\ORMExecutor',
+            $fixtures
+        );
+
+        $users = $this->userRepository->findAll();
+
+        // The two files with fixtures have been loaded, there are 4 users.
+        $this->assertCount(
+            4,
+            $users
+        );
+    }
+
     public function testToolType(): void
     {
         $this->assertInstanceOf(ORMDatabaseTool::class, $this->databaseTool);
diff --git a/tests/Test/ConfigSqliteTest.php b/tests/Test/ConfigSqliteTest.php
index 15fd915f..8f5b7568 100644
--- a/tests/Test/ConfigSqliteTest.php
+++ b/tests/Test/ConfigSqliteTest.php
@@ -165,7 +165,7 @@ public function loadAllFixtures(): void
             $repository
         );
 
-        $users = $this->userRepository->findAll();
+        $users = $repository->findAll();
 
         // The fixture group myGroup contains 3 users
         $this->assertCount(
@@ -188,7 +188,7 @@ public function loadAllFixtures(): void
             $repository
         );
 
-        $users = $this->userRepository->findAll();
+        $users = $repository->findAll();
 
         // Loading all fixtures results in 12 users.
         $this->assertCount(
@@ -209,8 +209,17 @@ public function testAppendFixtures(): void
         );
 
         // Load data from database
-        /** @var User $user */
-        $user = $this->userRepository
+        $users = $this->userRepository->findAll();
+
+        // Check that there are 3 users.
+        $this->assertCount(
+            3,
+            $users
+        );
+
+        // Load data from database
+        /** @var User $user1 */
+        $user1 = $this->userRepository
             ->findOneBy([
                 'id' => 1,
             ])
@@ -218,19 +227,31 @@ public function testAppendFixtures(): void
 
         $this->assertSame(
             'foo@bar.com',
-            $user->getEmail()
+            $user1->getEmail()
         );
 
-        /** @var User $user */
-        $user = $this->userRepository
+        /** @var User $user2 */
+        $user2 = $this->userRepository
+            ->findOneBy([
+                'id' => 2,
+            ])
+        ;
+
+        $this->assertSame(
+            'bob@bar.com',
+            $user2->getEmail()
+        );
+
+        /** @var User $user3 */
+        $user3 = $this->userRepository
             ->findOneBy([
                 'id' => 3,
             ])
         ;
 
         $this->assertSame(
-            'bar@foo.com',
-            $user->getEmail()
+            'alice@bar.com',
+            $user3->getEmail()
         );
     }
 
@@ -390,8 +411,12 @@ public function testLoadFixturesFilesPaths(): void
             $fixtures
         );
 
+        $fixtureId = 'user_id_1';
+
+        $this->assertArrayHasKey($fixtureId, $fixtures);
+
         /** @var User $user1 */
-        $user1 = $fixtures['id1'];
+        $user1 = $fixtures[$fixtureId];
 
         $this->assertIsString($user1->getEmail());
 
diff --git a/tests/Test/ConfigTest.php b/tests/Test/ConfigTest.php
index ac2aa60f..1097bad2 100644
--- a/tests/Test/ConfigTest.php
+++ b/tests/Test/ConfigTest.php
@@ -75,27 +75,37 @@ public function testLoadFixturesFilesWithCustomProvider(): void
             $fixtures
         );
 
-        /** @var User $user */
-        $user = $fixtures['id1'];
+        $fixtureId = 'user_id_1';
+
+        $this->assertArrayHasKey($fixtureId, $fixtures);
+
+        /** @var User $user1 */
+        $user1 = $fixtures[$fixtureId];
 
         // The custom provider has not been used successfully.
         $this->assertStringStartsNotWith(
             'foo',
-            $user->getName()
+            $user1->getName()
         );
 
+        $this->getTestContainer()->get('doctrine')->getManager()->clear();
+
         // Load Data Fixtures with custom loader defined in configuration.
         $fixtures = $this->databaseTool->loadAliceFixture([
             '@AcmeBundle/DataFixtures/ORM/user_with_custom_provider.yml',
         ]);
 
-        /** @var User $user */
-        $user = $fixtures['id1'];
+        $fixtureId = 'custom_user_id_11';
+
+        $this->assertArrayHasKey($fixtureId, $fixtures);
+
+        /** @var User $user11 */
+        $user11 = $fixtures[$fixtureId];
 
         // The custom provider "foo" has been loaded and used successfully.
         $this->assertSame(
             'fooa string',
-            $user->getName()
+            $user11->getName()
         );
     }