diff --git a/src/Documentation/Action/DocumentationAction.php b/src/Documentation/Action/DocumentationAction.php
index 533f84b3455..221351beebe 100644
--- a/src/Documentation/Action/DocumentationAction.php
+++ b/src/Documentation/Action/DocumentationAction.php
@@ -21,6 +21,7 @@
 use ApiPlatform\OpenApi\Factory\OpenApiFactoryInterface;
 use ApiPlatform\OpenApi\OpenApi;
 use ApiPlatform\OpenApi\Serializer\ApiGatewayNormalizer;
+use ApiPlatform\OpenApi\Serializer\LegacyOpenApiNormalizer;
 use ApiPlatform\OpenApi\Serializer\OpenApiNormalizer;
 use ApiPlatform\State\ProcessorInterface;
 use ApiPlatform\State\ProviderInterface;
@@ -60,7 +61,11 @@ public function __invoke(Request $request = null)
             return new Documentation($this->resourceNameCollectionFactory->create(), $this->title, $this->description, $this->version);
         }
 
-        $context = ['api_gateway' => $request->query->getBoolean(ApiGatewayNormalizer::API_GATEWAY), 'base_url' => $request->getBaseUrl()];
+        $context = [
+            'api_gateway' => $request->query->getBoolean(ApiGatewayNormalizer::API_GATEWAY),
+            'base_url' => $request->getBaseUrl(),
+            'spec_version' => $request->query->getString(LegacyOpenApiNormalizer::SPEC_VERSION),
+        ];
         $request->attributes->set('_api_normalization_context', $request->attributes->get('_api_normalization_context', []) + $context);
         $format = $this->getRequestFormat($request, $this->documentationFormats);
 
@@ -78,7 +83,18 @@ private function getOpenApiDocumentation(array $context, string $format, Request
     {
         if ($this->provider && $this->processor) {
             $context['request'] = $request;
-            $operation = new Get(class: OpenApi::class, read: true, serialize: true, provider: fn () => $this->openApiFactory->__invoke($context), normalizationContext: [ApiGatewayNormalizer::API_GATEWAY => $context['api_gateway'] ?? null], outputFormats: $this->documentationFormats);
+            $operation = new Get(
+                class: OpenApi::class,
+                read: true,
+                serialize: true,
+                provider: fn () => $this->openApiFactory->__invoke($context),
+                normalizationContext: [
+                    ApiGatewayNormalizer::API_GATEWAY => $context['api_gateway'] ?? null,
+                    LegacyOpenApiNormalizer::SPEC_VERSION => $context['spec_version'] ?? null,
+                ],
+                outputFormats: $this->documentationFormats
+            );
+
             if ('html' === $format) {
                 $operation = $operation->withProcessor('api_platform.swagger_ui.processor')->withWrite(true);
             }
diff --git a/src/OpenApi/Serializer/LegacyOpenApiNormalizer.php b/src/OpenApi/Serializer/LegacyOpenApiNormalizer.php
new file mode 100644
index 00000000000..8bbcd77b3ed
--- /dev/null
+++ b/src/OpenApi/Serializer/LegacyOpenApiNormalizer.php
@@ -0,0 +1,65 @@
+<?php
+
+/*
+ * This file is part of the API Platform project.
+ *
+ * (c) Kévin Dunglas <dunglas@gmail.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+declare(strict_types=1);
+
+namespace ApiPlatform\OpenApi\Serializer;
+
+use Symfony\Component\Serializer\Normalizer\NormalizerInterface;
+
+final class LegacyOpenApiNormalizer implements NormalizerInterface
+{
+    public const SPEC_VERSION = 'spec_version';
+    private array $defaultContext = [
+        self::SPEC_VERSION => '3.1.0',
+    ];
+
+    public function __construct(private readonly NormalizerInterface $decorated, $defaultContext = [])
+    {
+        $this->defaultContext = array_merge($this->defaultContext, $defaultContext);
+    }
+
+    public function normalize(mixed $object, string $format = null, array $context = []): array
+    {
+        $openapi = $this->decorated->normalize($object, $format, $context);
+
+        if ('3.0' !== $context['spec_version']) {
+            return $openapi;
+        }
+
+        foreach ($openapi['components']['schemas'] as &$schema) {
+            foreach ($schema['properties'] ?? [] as &$property) {
+                if (isset($property['type']) && \is_array($property['type'])) {
+                    $property['type'] = $property['type'][0];
+                }
+
+                if (isset($property['type']['owl:maxCardinality'])) {
+                    unset($proprety['type']['owl:maxCardinality']);
+                }
+            }
+        }
+
+        return $openapi;
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function supportsNormalization(mixed $data, string $format = null, array $context = []): bool
+    {
+        return $this->decorated->supportsNormalization($data, $format, $context);
+    }
+
+    public function getSupportedTypes($format): array
+    {
+        return $this->decorated->getSupportedTypes($format);
+    }
+}
diff --git a/src/Symfony/Bundle/Resources/config/openapi.xml b/src/Symfony/Bundle/Resources/config/openapi.xml
index 358c48fe5c8..3c53659a5cb 100644
--- a/src/Symfony/Bundle/Resources/config/openapi.xml
+++ b/src/Symfony/Bundle/Resources/config/openapi.xml
@@ -58,7 +58,12 @@
 
         <service id="api_platform.openapi.normalizer.api_gateway"  class="ApiPlatform\OpenApi\Serializer\ApiGatewayNormalizer" public="false" decorates="api_platform.openapi.normalizer" decoration-priority="-1">
             <argument type="service" id="api_platform.openapi.normalizer.api_gateway.inner" />
-            <tag name="serializer.normalizer" priority="-780" />
+            <tag name="serializer.normalizer" />
+        </service>
+
+        <service id="api_platform.openapi.normalizer.legacy"  class="ApiPlatform\OpenApi\Serializer\LegacyOpenApiNormalizer" public="false" decorates="api_platform.openapi.normalizer.api_gateway" decoration-priority="-2">
+            <argument type="service" id="api_platform.openapi.normalizer.legacy.inner" />
+            <tag name="serializer.normalizer" />
         </service>
         <service id="ApiPlatform\OpenApi\Factory\OpenApiFactoryInterface" alias="api_platform.openapi.factory" />