diff --git a/DependencyInjection/DoctrineExtension.php b/DependencyInjection/DoctrineExtension.php
index 450dbd3d7..e03bf5774 100644
--- a/DependencyInjection/DoctrineExtension.php
+++ b/DependencyInjection/DoctrineExtension.php
@@ -21,7 +21,6 @@
 use Doctrine\ORM\EntityManager;
 use Doctrine\ORM\EntityManagerInterface;
 use Doctrine\ORM\Id\AbstractIdGenerator;
-use Doctrine\ORM\Mapping\Driver\SimplifiedXmlDriver;
 use Doctrine\ORM\Proxy\Autoloader;
 use Doctrine\ORM\Tools\Console\Command\ConvertMappingCommand;
 use Doctrine\ORM\Tools\Console\Command\EnsureProductionSettingsCommand;
@@ -64,7 +63,6 @@
 use function array_intersect_key;
 use function array_keys;
 use function class_exists;
-use function count;
 use function interface_exists;
 use function is_dir;
 use function method_exists;
@@ -785,7 +783,6 @@ protected function loadOrmEntityManagerMappingInformation(array $entityManager,
 
         $this->loadMappingInformation($entityManager, $container);
         $this->registerMappingDrivers($entityManager, $container);
-        $this->enableXmlMappingDriverXsdValidation($entityManager['name'], $container);
 
         $ormConfigDef->addMethodCall('setEntityNamespaces', [$this->aliasMap]);
     }
@@ -1132,32 +1129,4 @@ private function useMiddlewaresIfAvailable(
                 ->addTag('doctrine.middleware', ['connection' => $connName]);
         }
     }
-
-    /**
-     * TODO: remove this once we dropped support for ORM < 3.0
-     */
-    private function enableXmlMappingDriverXsdValidation(string $managerName, ContainerBuilder $container): void
-    {
-        $xmlDriverId = sprintf('doctrine.orm.%s_xml_metadata_driver', $managerName);
-
-        if (! $container->hasDefinition($xmlDriverId)) {
-            return;
-        }
-
-        $xmlDriverDef = $container->getDefinition($xmlDriverId);
-        $args         = $xmlDriverDef->getArguments();
-        $numberOfArgs = count($args);
-        if ($numberOfArgs === 0 || $numberOfArgs === 3) {
-            return;
-        }
-
-        if ($numberOfArgs < 2) {
-            $args[] = SimplifiedXmlDriver::DEFAULT_FILE_EXTENSION;
-        }
-
-        // enable validation
-        $args[] = true;
-
-        $xmlDriverDef->setArguments($args);
-    }
 }
diff --git a/Tests/ContainerTest.php b/Tests/ContainerTest.php
index 72d5a9c4d..54a6b26b3 100644
--- a/Tests/ContainerTest.php
+++ b/Tests/ContainerTest.php
@@ -59,10 +59,6 @@ public function testContainer(): void
         $this->assertInstanceOf(InfoCommand::class, $container->get('doctrine.mapping_info_command'));
         $this->assertInstanceOf(UpdateCommand::class, $container->get('doctrine.schema_update_command'));
 
-        $xmlDriverDef =  $container->getDefinition('doctrine.orm.default_xml_metadata_driver');
-        $this->assertCount(3, $xmlDriverDef->getArguments());
-        $this->assertTrue($xmlDriverDef->getArguments()[2]);
-
         $this->assertTrue(Type::hasType('test'));
 
         $this->assertFalse($container->has('doctrine.dbal.default_connection.events.mysqlsessioninit'));
diff --git a/Tests/DependencyInjection/AbstractDoctrineExtensionTest.php b/Tests/DependencyInjection/AbstractDoctrineExtensionTest.php
index 281570d21..2c8989d01 100644
--- a/Tests/DependencyInjection/AbstractDoctrineExtensionTest.php
+++ b/Tests/DependencyInjection/AbstractDoctrineExtensionTest.php
@@ -15,7 +15,6 @@
 use Doctrine\DBAL\Schema\LegacySchemaManagerFactory;
 use Doctrine\ORM\EntityManager;
 use Doctrine\ORM\EntityManagerInterface;
-use Doctrine\ORM\Mapping\Driver\SimplifiedXmlDriver;
 use Generator;
 use InvalidArgumentException;
 use PDO;
@@ -510,8 +509,6 @@ public function testSingleEntityManagerMultipleMappingBundleDefinitions(): void
         $xmlDef = $container->getDefinition('doctrine.orm.default_xml_metadata_driver');
         $this->assertDICConstructorArguments($xmlDef, [
             [__DIR__ . DIRECTORY_SEPARATOR . 'Fixtures' . DIRECTORY_SEPARATOR . 'Bundles' . DIRECTORY_SEPARATOR . 'XmlBundle' . DIRECTORY_SEPARATOR . 'Resources' . DIRECTORY_SEPARATOR . 'config' . DIRECTORY_SEPARATOR . 'doctrine' => 'Fixtures\Bundles\XmlBundle'],
-            SimplifiedXmlDriver::DEFAULT_FILE_EXTENSION,
-            true,
         ]);
     }
 
@@ -567,8 +564,6 @@ public function testMultipleEntityManagersMappingBundleDefinitions(): void
         $xmlDef = $container->getDefinition('doctrine.orm.em2_xml_metadata_driver');
         $this->assertDICConstructorArguments($xmlDef, [
             [__DIR__ . DIRECTORY_SEPARATOR . 'Fixtures' . DIRECTORY_SEPARATOR . 'Bundles' . DIRECTORY_SEPARATOR . 'XmlBundle' . DIRECTORY_SEPARATOR . 'Resources' . DIRECTORY_SEPARATOR . 'config' . DIRECTORY_SEPARATOR . 'doctrine' => 'Fixtures\Bundles\XmlBundle'],
-            SimplifiedXmlDriver::DEFAULT_FILE_EXTENSION,
-            true,
         ]);
     }
 
diff --git a/UPGRADE-2.9.md b/UPGRADE-2.9.md
index daff7dce2..c993016e6 100644
--- a/UPGRADE-2.9.md
+++ b/UPGRADE-2.9.md
@@ -30,10 +30,6 @@ doctrine:
                 schema_manager_factory: doctrine.dbal.default_schema_manager_factory
 ```
 
-### XSD Schema validation
-
-Starting with `doctrine/orm` 2.14.2 the XML mapping driver will have XSD validation enabled.
-
 ### Deprecations
 
 - the DBAL `platform_service` connection option is deprecated now. Use a driver middleware that would instantiate the platform instead.