diff --git a/src/Bundle/ChillMainBundle/Serializer/Normalizer/DateNormalizer.php b/src/Bundle/ChillMainBundle/Serializer/Normalizer/DateNormalizer.php
index 2493b1794..a98339d4b 100644
--- a/src/Bundle/ChillMainBundle/Serializer/Normalizer/DateNormalizer.php
+++ b/src/Bundle/ChillMainBundle/Serializer/Normalizer/DateNormalizer.php
@@ -22,7 +22,7 @@ class DateNormalizer implements ContextAwareNormalizerInterface, DenormalizerInt
 {
     public function __construct(private readonly RequestStack $requestStack, private readonly ParameterBagInterface $parameterBag) {}
 
-    public function denormalize($data, $type, $format = null, array $context = [])
+    public function denormalize($data, $type, $format = null, array $context = []): ?DateTimeInterface
     {
         if (null === $data) {
             return null;
@@ -51,7 +51,7 @@ class DateNormalizer implements ContextAwareNormalizerInterface, DenormalizerInt
         return $result;
     }
 
-    public function normalize($date, $format = null, array $context = [])
+    public function normalize($date, $format = null, array $context = []): array
     {
         /* @var DateTimeInterface $date */
         switch ($format) {