diff --git a/src/Sylius/Bundle/CoreBundle/Fixture/AbstractResourceFixture.php b/src/Sylius/Bundle/CoreBundle/Fixture/AbstractResourceFixture.php
index d02d38192e4..4ed46896877 100644
--- a/src/Sylius/Bundle/CoreBundle/Fixture/AbstractResourceFixture.php
+++ b/src/Sylius/Bundle/CoreBundle/Fixture/AbstractResourceFixture.php
@@ -71,7 +71,7 @@ public function __construct(ObjectManager $objectManager, ExampleFactoryInterfac
     /**
      * @param array $options
      */
-    final public function load(array $options)
+    final public function load(array $options): void
     {
         $options = $this->optionsResolver->resolve($options);
 
@@ -116,7 +116,7 @@ final public function getConfigTreeBuilder()
     /**
      * @param ArrayNodeDefinition $resourceNode
      */
-    protected function configureResourceNode(ArrayNodeDefinition $resourceNode)
+    protected function configureResourceNode(ArrayNodeDefinition $resourceNode): void
     {
         // empty
     }
diff --git a/src/Sylius/Bundle/CoreBundle/Fixture/AddressFixture.php b/src/Sylius/Bundle/CoreBundle/Fixture/AddressFixture.php
index f97fd7687dd..db76089be87 100644
--- a/src/Sylius/Bundle/CoreBundle/Fixture/AddressFixture.php
+++ b/src/Sylius/Bundle/CoreBundle/Fixture/AddressFixture.php
@@ -23,7 +23,7 @@ class AddressFixture extends AbstractResourceFixture
     /**
      * {@inheritdoc}
      */
-    public function getName()
+    public function getName(): string
     {
         return 'address';
     }
@@ -31,7 +31,7 @@ public function getName()
     /**
      * {@inheritdoc}
      */
-    protected function configureResourceNode(ArrayNodeDefinition $resourceNode)
+    protected function configureResourceNode(ArrayNodeDefinition $resourceNode): void
     {
         $resourceNode
             ->children()
diff --git a/src/Sylius/Bundle/CoreBundle/Fixture/AdminUserFixture.php b/src/Sylius/Bundle/CoreBundle/Fixture/AdminUserFixture.php
index d319d32b567..e4ef24a183f 100644
--- a/src/Sylius/Bundle/CoreBundle/Fixture/AdminUserFixture.php
+++ b/src/Sylius/Bundle/CoreBundle/Fixture/AdminUserFixture.php
@@ -23,7 +23,7 @@ class AdminUserFixture extends AbstractResourceFixture
     /**
      * {@inheritdoc}
      */
-    public function getName()
+    public function getName(): string
     {
         return 'admin_user';
     }
@@ -31,7 +31,7 @@ public function getName()
     /**
      * {@inheritdoc}
      */
-    protected function configureResourceNode(ArrayNodeDefinition $resourceNode)
+    protected function configureResourceNode(ArrayNodeDefinition $resourceNode): void
     {
         $resourceNode
             ->children()
diff --git a/src/Sylius/Bundle/CoreBundle/Fixture/BookProductFixture.php b/src/Sylius/Bundle/CoreBundle/Fixture/BookProductFixture.php
index 13f9d24f614..2dd3f3ae4a6 100644
--- a/src/Sylius/Bundle/CoreBundle/Fixture/BookProductFixture.php
+++ b/src/Sylius/Bundle/CoreBundle/Fixture/BookProductFixture.php
@@ -75,7 +75,7 @@ public function __construct(
     /**
      * {@inheritdoc}
      */
-    public function getName()
+    public function getName(): string
     {
         return 'book_product';
     }
@@ -83,7 +83,7 @@ public function getName()
     /**
      * {@inheritdoc}
      */
-    public function load(array $options)
+    public function load(array $options): void
     {
         $options = $this->optionsResolver->resolve($options);
 
@@ -143,7 +143,7 @@ public function load(array $options)
     /**
      * {@inheritdoc}
      */
-    protected function configureOptionsNode(ArrayNodeDefinition $optionsNode)
+    protected function configureOptionsNode(ArrayNodeDefinition $optionsNode): void
     {
         $optionsNode
             ->children()
diff --git a/src/Sylius/Bundle/CoreBundle/Fixture/ChannelFixture.php b/src/Sylius/Bundle/CoreBundle/Fixture/ChannelFixture.php
index 72bc9584903..0a1fda0c601 100644
--- a/src/Sylius/Bundle/CoreBundle/Fixture/ChannelFixture.php
+++ b/src/Sylius/Bundle/CoreBundle/Fixture/ChannelFixture.php
@@ -23,7 +23,7 @@ class ChannelFixture extends AbstractResourceFixture
     /**
      * {@inheritdoc}
      */
-    public function getName()
+    public function getName(): string
     {
         return 'channel';
     }
@@ -31,7 +31,7 @@ public function getName()
     /**
      * {@inheritdoc}
      */
-    protected function configureResourceNode(ArrayNodeDefinition $resourceNode)
+    protected function configureResourceNode(ArrayNodeDefinition $resourceNode): void
     {
         $resourceNode
             ->children()
diff --git a/src/Sylius/Bundle/CoreBundle/Fixture/CurrencyFixture.php b/src/Sylius/Bundle/CoreBundle/Fixture/CurrencyFixture.php
index 3a82dfcfa05..5bc5b6d64e5 100644
--- a/src/Sylius/Bundle/CoreBundle/Fixture/CurrencyFixture.php
+++ b/src/Sylius/Bundle/CoreBundle/Fixture/CurrencyFixture.php
@@ -47,7 +47,7 @@ public function __construct(FactoryInterface $currencyFactory, ObjectManager $cu
     /**
      * {@inheritdoc}
      */
-    public function load(array $options)
+    public function load(array $options): void
     {
         foreach ($options['currencies'] as $currencyCode) {
             /** @var CurrencyInterface $currency */
@@ -64,7 +64,7 @@ public function load(array $options)
     /**
      * {@inheritdoc}
      */
-    public function getName()
+    public function getName(): string
     {
         return 'currency';
     }
@@ -72,7 +72,7 @@ public function getName()
     /**
      * {@inheritdoc}
      */
-    protected function configureOptionsNode(ArrayNodeDefinition $optionsNode)
+    protected function configureOptionsNode(ArrayNodeDefinition $optionsNode): void
     {
         $optionsNode
             ->children()
diff --git a/src/Sylius/Bundle/CoreBundle/Fixture/CustomerGroupFixture.php b/src/Sylius/Bundle/CoreBundle/Fixture/CustomerGroupFixture.php
index 8286b555ad0..c6a96b023a9 100644
--- a/src/Sylius/Bundle/CoreBundle/Fixture/CustomerGroupFixture.php
+++ b/src/Sylius/Bundle/CoreBundle/Fixture/CustomerGroupFixture.php
@@ -23,7 +23,7 @@ class CustomerGroupFixture extends AbstractResourceFixture
     /**
      * {@inheritdoc}
      */
-    public function getName()
+    public function getName(): string
     {
         return 'customer_group';
     }
@@ -31,7 +31,7 @@ public function getName()
     /**
      * {@inheritdoc}
      */
-    protected function configureResourceNode(ArrayNodeDefinition $resourceNode)
+    protected function configureResourceNode(ArrayNodeDefinition $resourceNode): void
     {
         $resourceNode
             ->children()
diff --git a/src/Sylius/Bundle/CoreBundle/Fixture/GeographicalFixture.php b/src/Sylius/Bundle/CoreBundle/Fixture/GeographicalFixture.php
index 5b443392e76..4323f969a79 100644
--- a/src/Sylius/Bundle/CoreBundle/Fixture/GeographicalFixture.php
+++ b/src/Sylius/Bundle/CoreBundle/Fixture/GeographicalFixture.php
@@ -85,7 +85,7 @@ public function __construct(
     /**
      * {@inheritdoc}
      */
-    public function load(array $options)
+    public function load(array $options): void
     {
         $this->loadCountriesWithProvinces($options['countries'], $options['provinces']);
         $this->loadZones($options['zones'], $this->provideZoneValidator($options));
@@ -98,7 +98,7 @@ public function load(array $options)
     /**
      * {@inheritdoc}
      */
-    public function getName()
+    public function getName(): string
     {
         return 'geographical';
     }
@@ -106,7 +106,7 @@ public function getName()
     /**
      * {@inheritdoc}
      */
-    protected function configureOptionsNode(ArrayNodeDefinition $optionsNode)
+    protected function configureOptionsNode(ArrayNodeDefinition $optionsNode): void
     {
         $optionsNodeBuilder = $optionsNode->children();
 
diff --git a/src/Sylius/Bundle/CoreBundle/Fixture/LocaleFixture.php b/src/Sylius/Bundle/CoreBundle/Fixture/LocaleFixture.php
index c9c2bbaa22c..d4f76347753 100644
--- a/src/Sylius/Bundle/CoreBundle/Fixture/LocaleFixture.php
+++ b/src/Sylius/Bundle/CoreBundle/Fixture/LocaleFixture.php
@@ -54,7 +54,7 @@ public function __construct(FactoryInterface $localeFactory, ObjectManager $loca
     /**
      * {@inheritdoc}
      */
-    public function load(array $options)
+    public function load(array $options): void
     {
         $localesCodes = array_merge([$this->baseLocaleCode], $options['locales']);
 
@@ -73,7 +73,7 @@ public function load(array $options)
     /**
      * {@inheritdoc}
      */
-    public function getName()
+    public function getName(): string
     {
         return 'locale';
     }
@@ -81,7 +81,7 @@ public function getName()
     /**
      * {@inheritdoc}
      */
-    protected function configureOptionsNode(ArrayNodeDefinition $optionsNode)
+    protected function configureOptionsNode(ArrayNodeDefinition $optionsNode): void
     {
         $optionsNode
             ->children()
diff --git a/src/Sylius/Bundle/CoreBundle/Fixture/MugProductFixture.php b/src/Sylius/Bundle/CoreBundle/Fixture/MugProductFixture.php
index d9875de38ca..c62c823327e 100644
--- a/src/Sylius/Bundle/CoreBundle/Fixture/MugProductFixture.php
+++ b/src/Sylius/Bundle/CoreBundle/Fixture/MugProductFixture.php
@@ -82,7 +82,7 @@ public function __construct(
     /**
      * {@inheritdoc}
      */
-    public function getName()
+    public function getName(): string
     {
         return 'mug_product';
     }
@@ -90,7 +90,7 @@ public function getName()
     /**
      * {@inheritdoc}
      */
-    public function load(array $options)
+    public function load(array $options): void
     {
         $options = $this->optionsResolver->resolve($options);
 
@@ -155,7 +155,7 @@ public function load(array $options)
     /**
      * {@inheritdoc}
      */
-    protected function configureOptionsNode(ArrayNodeDefinition $optionsNode)
+    protected function configureOptionsNode(ArrayNodeDefinition $optionsNode): void
     {
         $optionsNode
             ->children()
diff --git a/src/Sylius/Bundle/CoreBundle/Fixture/OrderFixture.php b/src/Sylius/Bundle/CoreBundle/Fixture/OrderFixture.php
index 1dedc95d2fa..69e6c36e413 100644
--- a/src/Sylius/Bundle/CoreBundle/Fixture/OrderFixture.php
+++ b/src/Sylius/Bundle/CoreBundle/Fixture/OrderFixture.php
@@ -162,7 +162,7 @@ public function __construct(
     /**
      * {@inheritdoc}
      */
-    public function load(array $options)
+    public function load(array $options): void
     {
         $channels = $this->channelRepository->findAll();
         $customers = $this->customerRepository->findAll();
@@ -202,7 +202,7 @@ public function load(array $options)
     /**
      * {@inheritdoc}
      */
-    public function getName()
+    public function getName(): string
     {
         return 'order';
     }
@@ -210,7 +210,7 @@ public function getName()
     /**
      * {@inheritdoc}
      */
-    protected function configureOptionsNode(ArrayNodeDefinition $optionsNode)
+    protected function configureOptionsNode(ArrayNodeDefinition $optionsNode): void
     {
         $optionsNode
             ->children()
diff --git a/src/Sylius/Bundle/CoreBundle/Fixture/PaymentMethodFixture.php b/src/Sylius/Bundle/CoreBundle/Fixture/PaymentMethodFixture.php
index 6804e514505..7edb698adf0 100644
--- a/src/Sylius/Bundle/CoreBundle/Fixture/PaymentMethodFixture.php
+++ b/src/Sylius/Bundle/CoreBundle/Fixture/PaymentMethodFixture.php
@@ -23,7 +23,7 @@ class PaymentMethodFixture extends AbstractResourceFixture
     /**
      * {@inheritdoc}
      */
-    public function getName()
+    public function getName(): string
     {
         return 'payment_method';
     }
@@ -31,7 +31,7 @@ public function getName()
     /**
      * {@inheritdoc}
      */
-    protected function configureResourceNode(ArrayNodeDefinition $resourceNode)
+    protected function configureResourceNode(ArrayNodeDefinition $resourceNode): void
     {
         $resourceNode
             ->children()
diff --git a/src/Sylius/Bundle/CoreBundle/Fixture/ProductAssociationFixture.php b/src/Sylius/Bundle/CoreBundle/Fixture/ProductAssociationFixture.php
index 97665a5a5f9..b435c30677b 100644
--- a/src/Sylius/Bundle/CoreBundle/Fixture/ProductAssociationFixture.php
+++ b/src/Sylius/Bundle/CoreBundle/Fixture/ProductAssociationFixture.php
@@ -23,7 +23,7 @@ class ProductAssociationFixture extends AbstractResourceFixture
     /**
      * {@inheritdoc}
      */
-    public function getName()
+    public function getName(): string
     {
         return 'product_association';
     }
@@ -31,7 +31,7 @@ public function getName()
     /**
      * {@inheritdoc}
      */
-    protected function configureResourceNode(ArrayNodeDefinition $resourceNode)
+    protected function configureResourceNode(ArrayNodeDefinition $resourceNode): void
     {
         $resourceNode
             ->children()
diff --git a/src/Sylius/Bundle/CoreBundle/Fixture/ProductAssociationTypeFixture.php b/src/Sylius/Bundle/CoreBundle/Fixture/ProductAssociationTypeFixture.php
index 8b1ccd544c9..d7b819fcf15 100644
--- a/src/Sylius/Bundle/CoreBundle/Fixture/ProductAssociationTypeFixture.php
+++ b/src/Sylius/Bundle/CoreBundle/Fixture/ProductAssociationTypeFixture.php
@@ -23,7 +23,7 @@ class ProductAssociationTypeFixture extends AbstractResourceFixture
     /**
      * {@inheritdoc}
      */
-    public function getName()
+    public function getName(): string
     {
         return 'product_association_type';
     }
@@ -31,7 +31,7 @@ public function getName()
     /**
      * {@inheritdoc}
      */
-    protected function configureResourceNode(ArrayNodeDefinition $resourceNode)
+    protected function configureResourceNode(ArrayNodeDefinition $resourceNode): void
     {
         $resourceNode
             ->children()
diff --git a/src/Sylius/Bundle/CoreBundle/Fixture/ProductAttributeFixture.php b/src/Sylius/Bundle/CoreBundle/Fixture/ProductAttributeFixture.php
index d224226e84b..cf760320020 100644
--- a/src/Sylius/Bundle/CoreBundle/Fixture/ProductAttributeFixture.php
+++ b/src/Sylius/Bundle/CoreBundle/Fixture/ProductAttributeFixture.php
@@ -42,7 +42,7 @@ public function __construct(ObjectManager $objectManager, ExampleFactoryInterfac
     /**
      * {@inheritdoc}
      */
-    public function getName()
+    public function getName(): string
     {
         return 'product_attribute';
     }
@@ -50,7 +50,7 @@ public function getName()
     /**
      * {@inheritdoc}
      */
-    protected function configureResourceNode(ArrayNodeDefinition $resourceNode)
+    protected function configureResourceNode(ArrayNodeDefinition $resourceNode): void
     {
         $resourceNode
             ->children()
diff --git a/src/Sylius/Bundle/CoreBundle/Fixture/ProductFixture.php b/src/Sylius/Bundle/CoreBundle/Fixture/ProductFixture.php
index ca11fda38cd..31e4631075c 100644
--- a/src/Sylius/Bundle/CoreBundle/Fixture/ProductFixture.php
+++ b/src/Sylius/Bundle/CoreBundle/Fixture/ProductFixture.php
@@ -23,7 +23,7 @@ class ProductFixture extends AbstractResourceFixture
     /**
      * {@inheritdoc}
      */
-    public function getName()
+    public function getName(): string
     {
         return 'product';
     }
@@ -31,7 +31,7 @@ public function getName()
     /**
      * {@inheritdoc}
      */
-    protected function configureResourceNode(ArrayNodeDefinition $resourceNode)
+    protected function configureResourceNode(ArrayNodeDefinition $resourceNode): void
     {
         $resourceNode
             ->children()
diff --git a/src/Sylius/Bundle/CoreBundle/Fixture/ProductOptionFixture.php b/src/Sylius/Bundle/CoreBundle/Fixture/ProductOptionFixture.php
index ab706141c3c..ec5e4cb2e7b 100644
--- a/src/Sylius/Bundle/CoreBundle/Fixture/ProductOptionFixture.php
+++ b/src/Sylius/Bundle/CoreBundle/Fixture/ProductOptionFixture.php
@@ -23,7 +23,7 @@ class ProductOptionFixture extends AbstractResourceFixture
     /**
      * {@inheritdoc}
      */
-    public function getName()
+    public function getName(): string
     {
         return 'product_option';
     }
@@ -31,7 +31,7 @@ public function getName()
     /**
      * {@inheritdoc}
      */
-    protected function configureResourceNode(ArrayNodeDefinition $resourceNode)
+    protected function configureResourceNode(ArrayNodeDefinition $resourceNode): void
     {
         $resourceNode
             ->children()
diff --git a/src/Sylius/Bundle/CoreBundle/Fixture/ProductReviewFixture.php b/src/Sylius/Bundle/CoreBundle/Fixture/ProductReviewFixture.php
index 9bc0ac9c2fd..82f879837f0 100644
--- a/src/Sylius/Bundle/CoreBundle/Fixture/ProductReviewFixture.php
+++ b/src/Sylius/Bundle/CoreBundle/Fixture/ProductReviewFixture.php
@@ -23,7 +23,7 @@ class ProductReviewFixture extends AbstractResourceFixture
     /**
      * {@inheritdoc}
      */
-    public function getName()
+    public function getName(): string
     {
         return 'product_review';
     }
@@ -31,7 +31,7 @@ public function getName()
     /**
      * {@inheritdoc}
      */
-    protected function configureResourceNode(ArrayNodeDefinition $resourceNode)
+    protected function configureResourceNode(ArrayNodeDefinition $resourceNode): void
     {
         $resourceNode
             ->children()
diff --git a/src/Sylius/Bundle/CoreBundle/Fixture/PromotionFixture.php b/src/Sylius/Bundle/CoreBundle/Fixture/PromotionFixture.php
index 9825089d8db..0a6b61defed 100644
--- a/src/Sylius/Bundle/CoreBundle/Fixture/PromotionFixture.php
+++ b/src/Sylius/Bundle/CoreBundle/Fixture/PromotionFixture.php
@@ -23,7 +23,7 @@ class PromotionFixture extends AbstractResourceFixture
     /**
      * {@inheritdoc}
      */
-    public function getName()
+    public function getName(): string
     {
         return 'promotion';
     }
@@ -31,7 +31,7 @@ public function getName()
     /**
      * {@inheritdoc}
      */
-    protected function configureResourceNode(ArrayNodeDefinition $resourceNode)
+    protected function configureResourceNode(ArrayNodeDefinition $resourceNode): void
     {
         $resourceNode
             ->children()
diff --git a/src/Sylius/Bundle/CoreBundle/Fixture/ShippingCategoryFixture.php b/src/Sylius/Bundle/CoreBundle/Fixture/ShippingCategoryFixture.php
index a5f80db9619..fac2d2d9fca 100644
--- a/src/Sylius/Bundle/CoreBundle/Fixture/ShippingCategoryFixture.php
+++ b/src/Sylius/Bundle/CoreBundle/Fixture/ShippingCategoryFixture.php
@@ -23,7 +23,7 @@ class ShippingCategoryFixture extends AbstractResourceFixture
     /**
      * {@inheritdoc}
      */
-    public function getName()
+    public function getName(): string
     {
         return 'shipping_category';
     }
@@ -31,7 +31,7 @@ public function getName()
     /**
      * {@inheritdoc}
      */
-    protected function configureResourceNode(ArrayNodeDefinition $resourceNode)
+    protected function configureResourceNode(ArrayNodeDefinition $resourceNode): void
     {
         $resourceNode
             ->children()
diff --git a/src/Sylius/Bundle/CoreBundle/Fixture/ShippingMethodFixture.php b/src/Sylius/Bundle/CoreBundle/Fixture/ShippingMethodFixture.php
index d0489534180..a6f697d4bdf 100644
--- a/src/Sylius/Bundle/CoreBundle/Fixture/ShippingMethodFixture.php
+++ b/src/Sylius/Bundle/CoreBundle/Fixture/ShippingMethodFixture.php
@@ -23,7 +23,7 @@ class ShippingMethodFixture extends AbstractResourceFixture
     /**
      * {@inheritdoc}
      */
-    public function getName()
+    public function getName(): string
     {
         return 'shipping_method';
     }
@@ -31,7 +31,7 @@ public function getName()
     /**
      * {@inheritdoc}
      */
-    protected function configureResourceNode(ArrayNodeDefinition $resourceNode)
+    protected function configureResourceNode(ArrayNodeDefinition $resourceNode): void
     {
         $resourceNode
             ->children()
diff --git a/src/Sylius/Bundle/CoreBundle/Fixture/ShopUserFixture.php b/src/Sylius/Bundle/CoreBundle/Fixture/ShopUserFixture.php
index dfe378636da..9b89f1af704 100644
--- a/src/Sylius/Bundle/CoreBundle/Fixture/ShopUserFixture.php
+++ b/src/Sylius/Bundle/CoreBundle/Fixture/ShopUserFixture.php
@@ -23,7 +23,7 @@ class ShopUserFixture extends AbstractResourceFixture
     /**
      * {@inheritdoc}
      */
-    public function getName()
+    public function getName(): string
     {
         return 'shop_user';
     }
@@ -31,7 +31,7 @@ public function getName()
     /**
      * {@inheritdoc}
      */
-    protected function configureResourceNode(ArrayNodeDefinition $resourceNode)
+    protected function configureResourceNode(ArrayNodeDefinition $resourceNode): void
     {
         $resourceNode
             ->children()
diff --git a/src/Sylius/Bundle/CoreBundle/Fixture/SimilarProductAssociationFixture.php b/src/Sylius/Bundle/CoreBundle/Fixture/SimilarProductAssociationFixture.php
index 2a7f78698f4..82322b8dce2 100644
--- a/src/Sylius/Bundle/CoreBundle/Fixture/SimilarProductAssociationFixture.php
+++ b/src/Sylius/Bundle/CoreBundle/Fixture/SimilarProductAssociationFixture.php
@@ -74,7 +74,7 @@ public function __construct(
     /**
      * {@inheritdoc}
      */
-    public function getName()
+    public function getName(): string
     {
         return 'similar_product_association';
     }
@@ -82,7 +82,7 @@ public function getName()
     /**
      * {@inheritdoc}
      */
-    public function load(array $options)
+    public function load(array $options): void
     {
         $options = $this->optionsResolver->resolve($options);
 
@@ -110,7 +110,7 @@ public function load(array $options)
     /**
      * {@inheritdoc}
      */
-    protected function configureOptionsNode(ArrayNodeDefinition $optionsNode)
+    protected function configureOptionsNode(ArrayNodeDefinition $optionsNode): void
     {
         $optionsNode
             ->children()
diff --git a/src/Sylius/Bundle/CoreBundle/Fixture/StickerProductFixture.php b/src/Sylius/Bundle/CoreBundle/Fixture/StickerProductFixture.php
index 8257795515b..1d4785b9ddb 100644
--- a/src/Sylius/Bundle/CoreBundle/Fixture/StickerProductFixture.php
+++ b/src/Sylius/Bundle/CoreBundle/Fixture/StickerProductFixture.php
@@ -82,7 +82,7 @@ public function __construct(
     /**
      * {@inheritdoc}
      */
-    public function getName()
+    public function getName(): string
     {
         return 'sticker_product';
     }
@@ -90,7 +90,7 @@ public function getName()
     /**
      * {@inheritdoc}
      */
-    public function load(array $options)
+    public function load(array $options): void
     {
         $options = $this->optionsResolver->resolve($options);
 
@@ -149,7 +149,7 @@ public function load(array $options)
     /**
      * {@inheritdoc}
      */
-    protected function configureOptionsNode(ArrayNodeDefinition $optionsNode)
+    protected function configureOptionsNode(ArrayNodeDefinition $optionsNode): void
     {
         $optionsNode
             ->children()
diff --git a/src/Sylius/Bundle/CoreBundle/Fixture/TaxCategoryFixture.php b/src/Sylius/Bundle/CoreBundle/Fixture/TaxCategoryFixture.php
index 82d272843e0..c0b96fb0370 100644
--- a/src/Sylius/Bundle/CoreBundle/Fixture/TaxCategoryFixture.php
+++ b/src/Sylius/Bundle/CoreBundle/Fixture/TaxCategoryFixture.php
@@ -23,7 +23,7 @@ class TaxCategoryFixture extends AbstractResourceFixture
     /**
      * {@inheritdoc}
      */
-    public function getName()
+    public function getName(): string
     {
         return 'tax_category';
     }
@@ -31,7 +31,7 @@ public function getName()
     /**
      * {@inheritdoc}
      */
-    protected function configureResourceNode(ArrayNodeDefinition $resourceNode)
+    protected function configureResourceNode(ArrayNodeDefinition $resourceNode): void
     {
         $resourceNode
             ->children()
diff --git a/src/Sylius/Bundle/CoreBundle/Fixture/TaxRateFixture.php b/src/Sylius/Bundle/CoreBundle/Fixture/TaxRateFixture.php
index ffc59cf6bf2..51f456751f6 100644
--- a/src/Sylius/Bundle/CoreBundle/Fixture/TaxRateFixture.php
+++ b/src/Sylius/Bundle/CoreBundle/Fixture/TaxRateFixture.php
@@ -23,7 +23,7 @@ class TaxRateFixture extends AbstractResourceFixture
     /**
      * {@inheritdoc}
      */
-    public function getName()
+    public function getName(): string
     {
         return 'tax_rate';
     }
@@ -31,7 +31,7 @@ public function getName()
     /**
      * {@inheritdoc}
      */
-    protected function configureResourceNode(ArrayNodeDefinition $resourceNode)
+    protected function configureResourceNode(ArrayNodeDefinition $resourceNode): void
     {
         $resourceNode
             ->children()
diff --git a/src/Sylius/Bundle/CoreBundle/Fixture/TaxonFixture.php b/src/Sylius/Bundle/CoreBundle/Fixture/TaxonFixture.php
index 1daf9e8ed5b..7314d5f5eb7 100644
--- a/src/Sylius/Bundle/CoreBundle/Fixture/TaxonFixture.php
+++ b/src/Sylius/Bundle/CoreBundle/Fixture/TaxonFixture.php
@@ -23,7 +23,7 @@ class TaxonFixture extends AbstractResourceFixture
     /**
      * {@inheritdoc}
      */
-    public function getName()
+    public function getName(): string
     {
         return 'taxon';
     }
@@ -31,7 +31,7 @@ public function getName()
     /**
      * {@inheritdoc}
      */
-    protected function configureResourceNode(ArrayNodeDefinition $resourceNode)
+    protected function configureResourceNode(ArrayNodeDefinition $resourceNode): void
     {
         $resourceNode
             ->children()
diff --git a/src/Sylius/Bundle/CoreBundle/Fixture/TshirtProductFixture.php b/src/Sylius/Bundle/CoreBundle/Fixture/TshirtProductFixture.php
index 8ffb012c54e..5bb8866501b 100644
--- a/src/Sylius/Bundle/CoreBundle/Fixture/TshirtProductFixture.php
+++ b/src/Sylius/Bundle/CoreBundle/Fixture/TshirtProductFixture.php
@@ -81,7 +81,7 @@ public function __construct(
     /**
      * {@inheritdoc}
      */
-    public function getName()
+    public function getName(): string
     {
         return 'tshirt_product';
     }
@@ -89,7 +89,7 @@ public function getName()
     /**
      * {@inheritdoc}
      */
-    public function load(array $options)
+    public function load(array $options): void
     {
         $options = $this->optionsResolver->resolve($options);
 
@@ -175,7 +175,7 @@ public function load(array $options)
     /**
      * {@inheritdoc}
      */
-    protected function configureOptionsNode(ArrayNodeDefinition $optionsNode)
+    protected function configureOptionsNode(ArrayNodeDefinition $optionsNode): void
     {
         $optionsNode
             ->children()