diff --git a/CHANGELOG.md b/CHANGELOG.md
index c2b89af2652..440b5515c98 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -2,6 +2,7 @@
 
 ## 2.6.5
 
+* JsonSchema: Update Hydra `@context` property possible types
 * Filter validation: Fix issue in Required filter validator with dot notation (#4221)
 * OpenAPI: Fix notice/warning for `response` without `content` in the `openapi_context` (#4210)
 * OpenAPI: Do not use output for request body (#4213)
diff --git a/src/Hydra/JsonSchema/SchemaFactory.php b/src/Hydra/JsonSchema/SchemaFactory.php
index c3f82538df2..a3c95897509 100644
--- a/src/Hydra/JsonSchema/SchemaFactory.php
+++ b/src/Hydra/JsonSchema/SchemaFactory.php
@@ -13,6 +13,7 @@
 
 namespace ApiPlatform\Core\Hydra\JsonSchema;
 
+use ApiPlatform\Core\JsonLd\ContextBuilder;
 use ApiPlatform\Core\JsonSchema\Schema;
 use ApiPlatform\Core\JsonSchema\SchemaFactory as BaseSchemaFactory;
 use ApiPlatform\Core\JsonSchema\SchemaFactoryInterface;
@@ -35,7 +36,26 @@ final class SchemaFactory implements SchemaFactoryInterface
         '@type' => self::BASE_PROP,
     ];
     private const BASE_ROOT_PROPS = [
-        '@context' => self::BASE_PROP,
+        '@context' => [
+            'readOnly' => true,
+            'oneOf' => [
+                ['type' => 'string'],
+                [
+                    'type' => 'object',
+                    'properties' => [
+                        '@vocab' => [
+                            'type' => 'string',
+                        ],
+                        'hydra' => [
+                            'type' => 'string',
+                            'enum' => [ContextBuilder::HYDRA_NS],
+                        ],
+                    ],
+                    'required' => ['@vocab', 'hydra'],
+                    'additionalProperties' => true,
+                ],
+            ],
+        ],
     ] + self::BASE_PROPS;
 
     private $schemaFactory;
diff --git a/tests/Bridge/Symfony/Bundle/Test/ApiTestCaseTest.php b/tests/Bridge/Symfony/Bundle/Test/ApiTestCaseTest.php
index 7d8e3c37ecb..12fa9c00296 100644
--- a/tests/Bridge/Symfony/Bundle/Test/ApiTestCaseTest.php
+++ b/tests/Bridge/Symfony/Bundle/Test/ApiTestCaseTest.php
@@ -16,6 +16,7 @@
 use ApiPlatform\Core\Bridge\Symfony\Bundle\Test\ApiTestCase;
 use ApiPlatform\Core\Tests\Fixtures\TestBundle\Document\Dummy as DummyDocument;
 use ApiPlatform\Core\Tests\Fixtures\TestBundle\Entity\Dummy;
+use ApiPlatform\Core\Tests\Fixtures\TestBundle\Entity\DummyDtoInputOutput;
 use ApiPlatform\Core\Tests\Fixtures\TestBundle\Model\ResourceInterface;
 use Doctrine\ORM\EntityManagerInterface;
 use Doctrine\ORM\Tools\SchemaTool;
@@ -137,6 +138,21 @@ public function testAssertMatchesResourceItemJsonSchema(): void
         $this->assertMatchesResourceItemJsonSchema(ResourceInterface::class);
     }
 
+    public function testAssertMatchesResourceItemJsonSchemaOutput(): void
+    {
+        $this->recreateSchema();
+
+        /** @var EntityManagerInterface $manager */
+        $manager = self::$container->get('doctrine')->getManager();
+        $dummyDtoInputOutput = new DummyDtoInputOutput();
+        $dummyDtoInputOutput->str = 'lorem';
+        $dummyDtoInputOutput->num = 54;
+        $manager->persist($dummyDtoInputOutput);
+        $manager->flush();
+        self::createClient()->request('GET', '/dummy_dto_input_outputs/1');
+        $this->assertMatchesResourceItemJsonSchema(DummyDtoInputOutput::class);
+    }
+
     // Next tests have been imported from dms/phpunit-arraysubset-asserts, because the original constraint has been deprecated.
 
     public function testAssertArraySubsetPassesStrictConfig(): void
@@ -160,17 +176,7 @@ public function testAssertArraySubsetDoesNothingForValidScenario(): void
 
     public function testFindIriBy(): void
     {
-        self::bootKernel();
-        /**
-         * @var EntityManagerInterface
-         */
-        $manager = self::$container->get('doctrine')->getManager();
-        /** @var \Doctrine\ORM\Mapping\ClassMetadata[] $classes */
-        $classes = $manager->getMetadataFactory()->getAllMetadata();
-        $schemaTool = new SchemaTool($manager);
-
-        $schemaTool->dropSchema($classes);
-        $schemaTool->createSchema($classes);
+        $this->recreateSchema();
 
         self::createClient()->request('POST', '/dummies', [
             'headers' => [
@@ -185,4 +191,18 @@ public function testFindIriBy(): void
         $this->assertMatchesRegularExpression('~^/dummies/\d+~', self::findIriBy($resource, ['name' => 'Kevin']));
         $this->assertNull(self::findIriBy($resource, ['name' => 'not-exist']));
     }
+
+    private function recreateSchema(): void
+    {
+        self::bootKernel();
+
+        /** @var EntityManagerInterface $manager */
+        $manager = self::$container->get('doctrine')->getManager();
+        /** @var \Doctrine\ORM\Mapping\ClassMetadata[] $classes */
+        $classes = $manager->getMetadataFactory()->getAllMetadata();
+        $schemaTool = new SchemaTool($manager);
+
+        $schemaTool->dropSchema($classes);
+        $schemaTool->createSchema($classes);
+    }
 }
diff --git a/tests/Hydra/JsonSchema/SchemaFactoryTest.php b/tests/Hydra/JsonSchema/SchemaFactoryTest.php
index 5c29c60ae6b..598776381d5 100644
--- a/tests/Hydra/JsonSchema/SchemaFactoryTest.php
+++ b/tests/Hydra/JsonSchema/SchemaFactoryTest.php
@@ -15,6 +15,7 @@
 
 use ApiPlatform\Core\Api\OperationType;
 use ApiPlatform\Core\Hydra\JsonSchema\SchemaFactory;
+use ApiPlatform\Core\JsonLd\ContextBuilder;
 use ApiPlatform\Core\JsonSchema\Schema;
 use ApiPlatform\Core\JsonSchema\SchemaFactory as BaseSchemaFactory;
 use ApiPlatform\Core\JsonSchema\TypeFactoryInterface;
@@ -79,6 +80,29 @@ public function testHasRootDefinitionKeyBuildSchema(): void
         $this->assertArrayHasKey('properties', $definitions[$rootDefinitionKey]);
         $properties = $resultSchema['definitions'][$rootDefinitionKey]['properties'];
         $this->assertArrayHasKey('@context', $properties);
+        $this->assertSame(
+            [
+                'readOnly' => true,
+                'oneOf' => [
+                    ['type' => 'string'],
+                    [
+                        'type' => 'object',
+                        'properties' => [
+                            '@vocab' => [
+                                'type' => 'string',
+                            ],
+                            'hydra' => [
+                                'type' => 'string',
+                                'enum' => [ContextBuilder::HYDRA_NS],
+                            ],
+                        ],
+                        'required' => ['@vocab', 'hydra'],
+                        'additionalProperties' => true,
+                    ],
+                ],
+            ],
+            $properties['@context']
+        );
         $this->assertArrayHasKey('@type', $properties);
         $this->assertArrayHasKey('@id', $properties);
     }