diff --git a/api/src/Entity/Book.php b/api/src/Entity/Book.php
index 25dee0858..734f58e71 100644
--- a/api/src/Entity/Book.php
+++ b/api/src/Entity/Book.php
@@ -24,6 +24,8 @@
 use Symfony\Bridge\Doctrine\Types\UuidType;
 use Symfony\Bridge\Doctrine\Validator\Constraints\UniqueEntity;
 use Symfony\Component\Serializer\Annotation\Groups;
+use Symfony\Component\Serializer\Normalizer\AbstractNormalizer;
+use Symfony\Component\Serializer\Normalizer\AbstractObjectNormalizer;
 use Symfony\Component\Uid\Uuid;
 use Symfony\Component\Validator\Constraints as Assert;
 
@@ -61,11 +63,11 @@
         ),
     ],
     normalizationContext: [
-        'groups' => ['Book:read:admin', 'Enum:read'],
-        'skip_null_values' => true,
+        AbstractNormalizer::GROUPS => ['Book:read:admin', 'Enum:read'],
+        AbstractObjectNormalizer::SKIP_NULL_VALUES => true,
     ],
     denormalizationContext: [
-        'groups' => ['Book:write'],
+        AbstractNormalizer::GROUPS => ['Book:write'],
     ],
     // todo waiting for https://github.com/api-platform/core/pull/5844
 //    collectDenormalizationErrors: true,
@@ -80,8 +82,8 @@
         new Get(),
     ],
     normalizationContext: [
-        'groups' => ['Book:read', 'Enum:read'],
-        'skip_null_values' => true,
+        AbstractNormalizer::GROUPS => ['Book:read', 'Enum:read'],
+        AbstractObjectNormalizer::SKIP_NULL_VALUES => true,
     ]
 )]
 #[ORM\Entity(repositoryClass: BookRepository::class)]
diff --git a/api/src/Entity/Bookmark.php b/api/src/Entity/Bookmark.php
index 14bc11c61..b769e7f68 100644
--- a/api/src/Entity/Bookmark.php
+++ b/api/src/Entity/Bookmark.php
@@ -19,6 +19,8 @@
 use Doctrine\ORM\Mapping as ORM;
 use Symfony\Bridge\Doctrine\Types\UuidType;
 use Symfony\Component\Serializer\Annotation\Groups;
+use Symfony\Component\Serializer\Normalizer\AbstractNormalizer;
+use Symfony\Component\Serializer\Normalizer\AbstractObjectNormalizer;
 use Symfony\Component\Uid\Uuid;
 use Symfony\Component\Validator\Constraints as Assert;
 
@@ -40,14 +42,14 @@
         ),
     ],
     normalizationContext: [
-        'groups' => ['Bookmark:read'],
-        'skip_null_values' => true,
+        AbstractNormalizer::GROUPS => ['Bookmark:read'],
+        AbstractObjectNormalizer::SKIP_NULL_VALUES => true,
         IriTransformerNormalizer::CONTEXT_KEY => [
             'book' => '/books/{id}{._format}',
         ],
     ],
     denormalizationContext: [
-        'groups' => ['Bookmark:write'],
+        AbstractNormalizer::GROUPS => ['Bookmark:write'],
     ],
     // todo waiting for https://github.com/api-platform/core/pull/5844
 //    collectDenormalizationErrors: true,
diff --git a/api/src/Entity/Review.php b/api/src/Entity/Review.php
index 1c78b3aab..229115776 100644
--- a/api/src/Entity/Review.php
+++ b/api/src/Entity/Review.php
@@ -24,6 +24,8 @@
 use Doctrine\ORM\Mapping as ORM;
 use Symfony\Bridge\Doctrine\Types\UuidType;
 use Symfony\Component\Serializer\Annotation\Groups;
+use Symfony\Component\Serializer\Normalizer\AbstractNormalizer;
+use Symfony\Component\Serializer\Normalizer\AbstractObjectNormalizer;
 use Symfony\Component\Uid\Uuid;
 use Symfony\Component\Validator\Constraints as Assert;
 
@@ -66,11 +68,11 @@
             'book' => '/admin/books/{id}{._format}',
             'user' => '/admin/users/{id}{._format}',
         ],
-        'skip_null_values' => true,
-        'groups' => ['Review:read', 'Review:read:admin'],
+        AbstractObjectNormalizer::SKIP_NULL_VALUES => true,
+        AbstractNormalizer::GROUPS => ['Review:read', 'Review:read:admin'],
     ],
     denormalizationContext: [
-        'groups' => ['Review:write', 'Review:write:admin'],
+        AbstractNormalizer::GROUPS => ['Review:write', 'Review:write:admin'],
     ],
     // todo waiting for https://github.com/api-platform/core/pull/5844
 //    collectDenormalizationErrors: true,
@@ -101,7 +103,7 @@
             processor: ReviewPersistProcessor::class,
             provider: CreateProvider::class,
             itemUriTemplate: '/books/{bookId}/reviews/{id}{._format}',
-            validationContext: ['groups' => ['Default', 'Review:create']]
+            validationContext: [AbstractNormalizer::GROUPS => ['Default', 'Review:create']]
         ),
         new Patch(
             uriTemplate: '/books/{bookId}/reviews/{id}{._format}',
@@ -129,11 +131,11 @@
             'book' => '/books/{id}{._format}',
             'user' => '/users/{id}{._format}',
         ],
-        'skip_null_values' => true,
-        'groups' => ['Review:read'],
+        AbstractObjectNormalizer::SKIP_NULL_VALUES => true,
+        AbstractNormalizer::GROUPS => ['Review:read'],
     ],
     denormalizationContext: [
-        'groups' => ['Review:write'],
+        AbstractNormalizer::GROUPS => ['Review:write'],
     ],
     // todo waiting for https://github.com/api-platform/core/pull/5844
 //    collectDenormalizationErrors: true
diff --git a/api/src/Entity/User.php b/api/src/Entity/User.php
index bc84bf169..237b01520 100644
--- a/api/src/Entity/User.php
+++ b/api/src/Entity/User.php
@@ -14,6 +14,8 @@
 use Symfony\Bridge\Doctrine\Validator\Constraints\UniqueEntity;
 use Symfony\Component\Security\Core\User\UserInterface;
 use Symfony\Component\Serializer\Annotation\Groups;
+use Symfony\Component\Serializer\Normalizer\AbstractNormalizer;
+use Symfony\Component\Serializer\Normalizer\AbstractObjectNormalizer;
 use Symfony\Component\Uid\Uuid;
 
 /**
@@ -41,8 +43,8 @@
         ),
     ],
     normalizationContext: [
-        'groups' => ['User:read'],
-        'skip_null_values' => true,
+        AbstractNormalizer::GROUPS => ['User:read'],
+        AbstractObjectNormalizer::SKIP_NULL_VALUES => true,
     ]
 )]
 #[ORM\Entity(repositoryClass: UserRepository::class)]