diff --git a/Annotation/Model.php b/Annotation/Model.php
index 43e7b84..083fbaa 100644
--- a/Annotation/Model.php
+++ b/Annotation/Model.php
@@ -11,15 +11,15 @@
 
 namespace Nelmio\ApiDocBundle\Annotation;
 
-use OpenApi\Annotations\AbstractAnnotation;
 use OpenApi\Annotations\Parameter;
+use OpenApi\Attributes\Attachable;
 use OpenApi\Generator;
 
 /**
  * @Annotation
  */
 #[\Attribute(\Attribute::TARGET_METHOD)]
-final class Model extends AbstractAnnotation
+final class Model extends Attachable
 {
     /** {@inheritdoc} */
     public static $_types = [
diff --git a/OpenApiPhp/ModelRegister.php b/OpenApiPhp/ModelRegister.php
index 7b675d2..938fb6b 100644
--- a/OpenApiPhp/ModelRegister.php
+++ b/OpenApiPhp/ModelRegister.php
@@ -16,6 +16,7 @@ use Nelmio\ApiDocBundle\Model\Model;
 use Nelmio\ApiDocBundle\Model\ModelRegistry;
 use OpenApi\Analysis;
 use OpenApi\Annotations as OA;
+use OpenApi\Generator;
 use Symfony\Component\PropertyInfo\Type;
 
 /**
@@ -116,13 +117,16 @@ final class ModelRegister
 
     private function detach(ModelAnnotation $model, OA\AbstractAnnotation $annotation, Analysis $analysis): void
     {
-        foreach ($annotation->_unmerged as $key => $unmerged) {
-            if ($unmerged === $model) {
-                unset($annotation->_unmerged[$key]);
+        if (Generator::UNDEFINED !== $annotation->attachables) {
+            foreach ($annotation->attachables as $key => $attachable) {
+                if ($attachable === $model) {
+                    unset($annotation->attachables[$key]);
 
-                break;
+                    break;
+                }
             }
         }
+
         $analysis->annotations->detach($model);
     }
 
@@ -137,9 +141,11 @@ final class ModelRegister
 
     private function getModel(OA\AbstractAnnotation $annotation): ?ModelAnnotation
     {
-        foreach ($annotation->_unmerged as $unmerged) {
-            if ($unmerged instanceof ModelAnnotation) {
-                return $unmerged;
+        if (Generator::UNDEFINED !== $annotation->attachables) {
+            foreach ($annotation->attachables as $attachable) {
+                if ($attachable instanceof ModelAnnotation) {
+                    return $attachable;
+                }
             }
         }
 
diff --git a/Tests/Functional/Controller/ApiController80.php b/Tests/Functional/Controller/ApiController80.php
index 72a59dd..5d79a11 100644
--- a/Tests/Functional/Controller/ApiController80.php
+++ b/Tests/Functional/Controller/ApiController80.php
@@ -11,12 +11,12 @@
 
 namespace Nelmio\ApiDocBundle\Tests\Functional\Controller;
 
-use Functional\Entity\ArticleInterface;
 use Nelmio\ApiDocBundle\Annotation\Areas;
 use Nelmio\ApiDocBundle\Annotation\Model;
 use Nelmio\ApiDocBundle\Annotation\Operation;
 use Nelmio\ApiDocBundle\Annotation\Security;
 use Nelmio\ApiDocBundle\Tests\Functional\Entity\Article;
+use Nelmio\ApiDocBundle\Tests\Functional\Entity\ArticleInterface;
 use Nelmio\ApiDocBundle\Tests\Functional\Entity\CompoundEntity;
 use Nelmio\ApiDocBundle\Tests\Functional\Entity\EntityWithAlternateType;
 use Nelmio\ApiDocBundle\Tests\Functional\Entity\EntityWithObjectType;
diff --git a/Tests/Functional/Entity/ArticleInterface.php b/Tests/Functional/Entity/ArticleInterface.php
index 931d19a..1ef41d6 100644
--- a/Tests/Functional/Entity/ArticleInterface.php
+++ b/Tests/Functional/Entity/ArticleInterface.php
@@ -1,6 +1,6 @@
 <?php
 
-namespace Functional\Entity;
+namespace Nelmio\ApiDocBundle\Tests\Functional\Entity;
 
 interface ArticleInterface
 {
diff --git a/composer.json b/composer.json
index 40dc8c1..b5dd728 100644
--- a/composer.json
+++ b/composer.json
@@ -30,7 +30,7 @@
         "symfony/options-resolver": "^4.4|^5.0|^6.0",
         "symfony/property-info": "^4.4|^5.0|^6.0",
         "symfony/routing": "^4.4|^5.0|^6.0",
-        "zircote/swagger-php": "^3.2|^4.0",
+        "zircote/swagger-php": "^4.2.0",
         "phpdocumentor/reflection-docblock": "^3.1|^4.0|^5.0"
     },
     "require-dev": {
diff --git a/phpunit.xml.dist b/phpunit.xml.dist
index f1fa494..6959691 100644
--- a/phpunit.xml.dist
+++ b/phpunit.xml.dist
@@ -13,6 +13,7 @@
     <php>
         <env name="SHELL_VERBOSITY" value="-1" />
         <ini name="error_reporting" value="-1" />
+        <ini name="memory_limit" value="512M" />
         <env name="SYMFONY_DEPRECATIONS_HELPER" value="max[self]=0" />
     </php>
 
@@ -21,18 +22,4 @@
             <directory>Tests</directory>
         </testsuite>
     </testsuites>
-
-    <filter>
-        <whitelist>
-            <directory>.</directory>
-            <exclude>
-                <directory>Tests</directory>
-                <directory>vendor</directory>
-            </exclude>
-        </whitelist>
-    </filter>
-
-    <php>
-        <ini name="memory_limit" value="512M" />
-    </php>
 </phpunit>