diff --git a/src/FixtureBuilder/Denormalizer/Fixture/SpecificationBagDenormalizer/Value/SimpleValueDenormalizer.php b/src/FixtureBuilder/Denormalizer/Fixture/SpecificationBagDenormalizer/Value/SimpleValueDenormalizer.php
index dace6cfb..1149454f 100644
--- a/src/FixtureBuilder/Denormalizer/Fixture/SpecificationBagDenormalizer/Value/SimpleValueDenormalizer.php
+++ b/src/FixtureBuilder/Denormalizer/Fixture/SpecificationBagDenormalizer/Value/SimpleValueDenormalizer.php
@@ -37,7 +37,7 @@ public function __construct(ParserInterface $parser)
         $this->parser = $parser;
     }
 
-    public function denormalize(FixtureInterface $scope, ?FlagBag $flags = null, $value)
+    public function denormalize(FixtureInterface $scope, ?FlagBag $flags, $value)
     {
         if (is_string($value)) {
             return $this->parseValue($this->parser, $value);
diff --git a/src/FixtureBuilder/Denormalizer/Fixture/SpecificationBagDenormalizer/Value/UniqueValueDenormalizer.php b/src/FixtureBuilder/Denormalizer/Fixture/SpecificationBagDenormalizer/Value/UniqueValueDenormalizer.php
index b172b88a..0c4d7b17 100644
--- a/src/FixtureBuilder/Denormalizer/Fixture/SpecificationBagDenormalizer/Value/UniqueValueDenormalizer.php
+++ b/src/FixtureBuilder/Denormalizer/Fixture/SpecificationBagDenormalizer/Value/UniqueValueDenormalizer.php
@@ -44,7 +44,7 @@ public function __construct(ValueDenormalizerInterface $decoratedDenormalizer)
      * @param  mixed                 $value
      * @throws InvalidScopeException
      */
-    public function denormalize(FixtureInterface $scope, ?FlagBag $flags = null, $value)
+    public function denormalize(FixtureInterface $scope, ?FlagBag $flags, $value)
     {
         $value = $this->denormalizer->denormalize($scope, $flags, $value);
 
diff --git a/src/FixtureBuilder/Denormalizer/Fixture/SpecificationBagDenormalizer/ValueDenormalizerInterface.php b/src/FixtureBuilder/Denormalizer/Fixture/SpecificationBagDenormalizer/ValueDenormalizerInterface.php
index 7d905adc..945a9885 100644
--- a/src/FixtureBuilder/Denormalizer/Fixture/SpecificationBagDenormalizer/ValueDenormalizerInterface.php
+++ b/src/FixtureBuilder/Denormalizer/Fixture/SpecificationBagDenormalizer/ValueDenormalizerInterface.php
@@ -30,5 +30,5 @@ interface ValueDenormalizerInterface
      *
      * @return ValueInterface|mixed
      */
-    public function denormalize(FixtureInterface $scope, ?FlagBag $flags = null, $value);
+    public function denormalize(FixtureInterface $scope, ?FlagBag $flags, $value);
 }
diff --git a/src/Generator/Resolver/Parameter/Chainable/StringParameterResolver.php b/src/Generator/Resolver/Parameter/Chainable/StringParameterResolver.php
index 2d1da737..0da43cda 100644
--- a/src/Generator/Resolver/Parameter/Chainable/StringParameterResolver.php
+++ b/src/Generator/Resolver/Parameter/Chainable/StringParameterResolver.php
@@ -89,7 +89,7 @@ static function ($match) use ($self, $context, $unresolvedParameters, &$resolved
      * @param string    $key       Key of the parameter that need to be resolved to resolve $parameter
      */
     private function resolveStringKey(
-        ?ParameterResolverInterface $resolver = null,
+        ?ParameterResolverInterface $resolver,
         Parameter $parameter,
         string $key,
         ParameterBag $unresolvedParameters,