diff --git a/composer.json b/composer.json
index dcbae1efc..d76fb466d 100644
--- a/composer.json
+++ b/composer.json
@@ -32,11 +32,11 @@
         "shopsys/framework": "16.0.x-dev",
         "shopsys/migrations": "16.0.x-dev",
         "shopsys/plugin-interface": "16.0.x-dev",
-        "symfony/config": "^5.4",
-        "symfony/dependency-injection": "^5.4",
-        "symfony/http-foundation": "^5.4",
-        "symfony/http-kernel": "^5.4",
-        "symfony/routing": "^5.4",
+        "symfony/config": "^6.4",
+        "symfony/dependency-injection": "^6.4",
+        "symfony/http-foundation": "^6.4",
+        "symfony/http-kernel": "^6.4",
+        "symfony/routing": "^6.4",
         "webonyx/graphql-php": "^15.6"
     },
     "require-dev": {
diff --git a/src/Component/Constraints/CustomerUserRoleGroup.php b/src/Component/Constraints/CustomerUserRoleGroup.php
index e62e5ee42..349ce2644 100644
--- a/src/Component/Constraints/CustomerUserRoleGroup.php
+++ b/src/Component/Constraints/CustomerUserRoleGroup.php
@@ -17,9 +17,8 @@ class CustomerUserRoleGroup extends Constraint
 
     /**
      * @var array<string, string>
-     * @phpcsSuppress SlevomatCodingStandard.TypeHints.PropertyTypeHint.MissingNativeTypeHint
      */
-    protected static $errorNames = [
+    protected const array ERROR_NAMES = [
         self::CUSTOMER_USER_ROLE_GROUP_NOT_FOUND => 'CUSTOMER_USER_ROLE_GROUP_NOT_FOUND',
     ];
 
diff --git a/src/Component/Constraints/CustomerUserRoleGroupAllowEdit.php b/src/Component/Constraints/CustomerUserRoleGroupAllowEdit.php
index fa57dca12..ac725b9e2 100644
--- a/src/Component/Constraints/CustomerUserRoleGroupAllowEdit.php
+++ b/src/Component/Constraints/CustomerUserRoleGroupAllowEdit.php
@@ -20,9 +20,8 @@ class CustomerUserRoleGroupAllowEdit extends Constraint
 
     /**
      * @var array<string, string>
-     * @phpcsSuppress SlevomatCodingStandard.TypeHints.PropertyTypeHint.MissingNativeTypeHint
      */
-    protected static $errorNames = [
+    protected const array ERROR_NAMES = [
         self::CUSTOMER_USER_ROLE_GROUP_CANNOT_BE_CHANGED => 'CUSTOMER_USER_ROLE_GROUP_CANNOT_BE_CHANGED',
         self::LAST_CUSTOMER_USER_ROLE_GROUP_CANNOT_BE_CHANGED => 'LAST_CUSTOMER_USER_ROLE_GROUP_CANNOT_BE_CHANGED',
     ];
diff --git a/src/Component/Constraints/CustomerUserRoleGroupAllowEditValidator.php b/src/Component/Constraints/CustomerUserRoleGroupAllowEditValidator.php
index cb18baf7b..adcd8b47d 100644
--- a/src/Component/Constraints/CustomerUserRoleGroupAllowEditValidator.php
+++ b/src/Component/Constraints/CustomerUserRoleGroupAllowEditValidator.php
@@ -31,7 +31,7 @@ public function __construct(
      * @param mixed $value
      * @param \Symfony\Component\Validator\Constraint $constraint
      */
-    public function validate($value, Constraint $constraint): void
+    public function validate(mixed $value, Constraint $constraint): void
     {
         if (!$constraint instanceof CustomerUserRoleGroupAllowEdit) {
             throw new UnexpectedTypeException($constraint, CustomerUserRoleGroupAllowEdit::class);
diff --git a/src/Component/Constraints/CustomerUserRoleGroupValidator.php b/src/Component/Constraints/CustomerUserRoleGroupValidator.php
index 5a9d82513..5fd664ae3 100644
--- a/src/Component/Constraints/CustomerUserRoleGroupValidator.php
+++ b/src/Component/Constraints/CustomerUserRoleGroupValidator.php
@@ -24,7 +24,7 @@ public function __construct(
      * @param mixed $value
      * @param \Symfony\Component\Validator\Constraint $constraint
      */
-    public function validate($value, Constraint $constraint)
+    public function validate(mixed $value, Constraint $constraint): void
     {
         if (!$constraint instanceof CustomerUserRoleGroup) {
             throw new UnexpectedTypeException($constraint, CustomerUserRoleGroup::class);
diff --git a/src/Component/Constraints/DeliveryAddressUuid.php b/src/Component/Constraints/DeliveryAddressUuid.php
index b73d68fcf..067c053bb 100644
--- a/src/Component/Constraints/DeliveryAddressUuid.php
+++ b/src/Component/Constraints/DeliveryAddressUuid.php
@@ -14,9 +14,8 @@ class DeliveryAddressUuid extends Constraint
 
     /**
      * @var array<string, string>
-     * @phpcsSuppress SlevomatCodingStandard.TypeHints.PropertyTypeHint.MissingNativeTypeHint
      */
-    protected static $errorNames = [
+    protected const array ERROR_NAMES = [
         self::LOGIN_REQUIRED_ERROR => 'LOGIN_REQUIRED_ERROR',
     ];
 
diff --git a/src/Component/Constraints/DeliveryAddressUuidValidator.php b/src/Component/Constraints/DeliveryAddressUuidValidator.php
index 2c6f6415e..bc9172578 100644
--- a/src/Component/Constraints/DeliveryAddressUuidValidator.php
+++ b/src/Component/Constraints/DeliveryAddressUuidValidator.php
@@ -24,7 +24,7 @@ public function __construct(
      * {@inheritdoc}
      */
     #[Override]
-    public function validate($value, Constraint $constraint): void
+    public function validate(mixed $value, Constraint $constraint): void
     {
         if (!$constraint instanceof DeliveryAddressUuid) {
             throw new UnexpectedTypeException($constraint, DeliveryAddressUuid::class);
diff --git a/src/Component/Constraints/FileUpload.php b/src/Component/Constraints/FileUpload.php
index 36117f82c..cadfbab18 100644
--- a/src/Component/Constraints/FileUpload.php
+++ b/src/Component/Constraints/FileUpload.php
@@ -14,10 +14,8 @@ class FileUpload extends Constraint
 
     /**
      * @var array<string, string>
-     * @phpcsSuppress SlevomatCodingStandard.TypeHints.PropertyTypeHint.MissingNativeTypeHint
-     * @phpcsSuppress SlevomatCodingStandard.Namespaces.ReferenceUsedNamesOnlySniff.ReferenceViaFullyQualifiedName
      */
-    protected static $errorNames = [
+    protected const array ERROR_NAMES = [
         self::TOO_BIG_ERROR => 'TOO_BIG_ERROR',
         self::UPLOAD_ERROR => 'UPLOAD_ERROR',
         self::MIMETYPE_ERROR => 'MIMETYPE_ERROR',
diff --git a/src/Component/Constraints/FileUploadValidator.php b/src/Component/Constraints/FileUploadValidator.php
index 4ce5e8150..8727953d9 100644
--- a/src/Component/Constraints/FileUploadValidator.php
+++ b/src/Component/Constraints/FileUploadValidator.php
@@ -16,7 +16,7 @@ class FileUploadValidator extends ConstraintValidator
      * @param mixed $value
      * @param \Symfony\Component\Validator\Constraint $constraint
      */
-    public function validate($value, Constraint $constraint): void
+    public function validate(mixed $value, Constraint $constraint): void
     {
         if (!$constraint instanceof FileUpload) {
             throw new UnexpectedTypeException($constraint, FileUpload::class);
diff --git a/src/Component/Constraints/PaymentInCart.php b/src/Component/Constraints/PaymentInCart.php
index 57c2e0d03..fae6b3c61 100644
--- a/src/Component/Constraints/PaymentInCart.php
+++ b/src/Component/Constraints/PaymentInCart.php
@@ -17,9 +17,8 @@ class PaymentInCart extends Constraint
 
     /**
      * @var array<string, string>
-     * @phpcsSuppress SlevomatCodingStandard.TypeHints.PropertyTypeHint.MissingNativeTypeHint
      */
-    protected static $errorNames = [
+    protected const array ERROR_NAMES = [
         self::UNAVAILABLE_PAYMENT_ERROR => 'UNAVAILABLE_PAYMENT_ERROR',
         self::INVALID_PAYMENT_TRANSPORT_COMBINATION_ERROR => 'INVALID_PAYMENT_TRANSPORT_COMBINATION_ERROR',
     ];
diff --git a/src/Component/Constraints/PaymentInCartValidator.php b/src/Component/Constraints/PaymentInCartValidator.php
index 2cde99475..3ad6ab1dd 100644
--- a/src/Component/Constraints/PaymentInCartValidator.php
+++ b/src/Component/Constraints/PaymentInCartValidator.php
@@ -32,7 +32,7 @@ public function __construct(
      * @param mixed $value
      * @param \Shopsys\FrontendApiBundle\Component\Constraints\PaymentInCart $constraint
      */
-    public function validate($value, Constraint $constraint)
+    public function validate(mixed $value, Constraint $constraint): void
     {
         if (!$constraint instanceof PaymentInCart) {
             throw new UnexpectedTypeException($constraint, PaymentInCart::class);
diff --git a/src/Component/Constraints/PaymentInExistingOrder.php b/src/Component/Constraints/PaymentInExistingOrder.php
index 7fc09b1e0..f7075a429 100644
--- a/src/Component/Constraints/PaymentInExistingOrder.php
+++ b/src/Component/Constraints/PaymentInExistingOrder.php
@@ -20,9 +20,8 @@ class PaymentInExistingOrder extends Constraint
 
     /**
      * @var array<string, string>
-     * @phpcsSuppress SlevomatCodingStandard.TypeHints.PropertyTypeHint.MissingNativeTypeHint
      */
-    protected static $errorNames = [
+    protected const array ERROR_NAMES = [
         self::UNAVAILABLE_PAYMENT_ERROR => 'UNAVAILABLE_PAYMENT_ERROR',
         self::UNCHANGEABLE_PAYMENT_ERROR => 'UNCHANGEABLE_PAYMENT_ERROR',
         self::INVALID_PAYMENT_SWIFT_ERROR => 'INVALID_PAYMENT_SWIFT_ERROR',
diff --git a/src/Component/Constraints/PaymentInExistingOrderValidator.php b/src/Component/Constraints/PaymentInExistingOrderValidator.php
index b3baadecd..2cebd1210 100644
--- a/src/Component/Constraints/PaymentInExistingOrderValidator.php
+++ b/src/Component/Constraints/PaymentInExistingOrderValidator.php
@@ -35,7 +35,7 @@ public function __construct(
      * @param mixed $value
      * @param \Symfony\Component\Validator\Constraint $constraint
      */
-    public function validate($value, Constraint $constraint): void
+    public function validate(mixed $value, Constraint $constraint): void
     {
         if (!$constraint instanceof PaymentInExistingOrder) {
             throw new UnexpectedTypeException($constraint, PaymentInExistingOrder::class);
diff --git a/src/Component/Constraints/PaymentInOrder.php b/src/Component/Constraints/PaymentInOrder.php
index 10d2f5e6f..788fcc705 100644
--- a/src/Component/Constraints/PaymentInOrder.php
+++ b/src/Component/Constraints/PaymentInOrder.php
@@ -20,9 +20,8 @@ class PaymentInOrder extends Constraint
 
     /**
      * @var array<string, string>
-     * @phpcsSuppress SlevomatCodingStandard.TypeHints.PropertyTypeHint.MissingNativeTypeHint
      */
-    protected static $errorNames = [
+    protected const array ERROR_NAMES = [
         self::PAYMENT_NOT_SET_ERROR => 'PAYMENT_NOT_SET_ERROR',
         self::UNAVAILABLE_PAYMENT_ERROR => 'UNAVAILABLE_PAYMENT_ERROR',
         self::CHANGED_PAYMENT_PRICE_ERROR => 'CHANGED_PAYMENT_PRICE_ERROR',
diff --git a/src/Component/Constraints/PaymentInOrderValidator.php b/src/Component/Constraints/PaymentInOrderValidator.php
index d18eefd58..b28f700b6 100644
--- a/src/Component/Constraints/PaymentInOrderValidator.php
+++ b/src/Component/Constraints/PaymentInOrderValidator.php
@@ -29,7 +29,7 @@ public function __construct(
      * @param mixed $value
      * @param \Shopsys\FrontendApiBundle\Component\Constraints\PaymentInOrder $constraint
      */
-    public function validate($value, Constraint $constraint)
+    public function validate(mixed $value, Constraint $constraint): void
     {
         if (!$constraint instanceof PaymentInOrder) {
             throw new UnexpectedTypeException($constraint, PaymentInOrder::class);
diff --git a/src/Component/Constraints/PaymentTransportRelation.php b/src/Component/Constraints/PaymentTransportRelation.php
index 28b301f78..8a0177ba3 100644
--- a/src/Component/Constraints/PaymentTransportRelation.php
+++ b/src/Component/Constraints/PaymentTransportRelation.php
@@ -17,9 +17,8 @@ class PaymentTransportRelation extends Constraint
 
     /**
      * @var array<string, string>
-     * @phpcsSuppress SlevomatCodingStandard.TypeHints.PropertyTypeHint.MissingNativeTypeHint
      */
-    protected static $errorNames = [
+    protected const array ERROR_NAMES = [
         self::INVALID_COMBINATION_ERROR => 'INVALID_COMBINATION_ERROR',
     ];
 
diff --git a/src/Component/Constraints/PaymentTransportRelationValidator.php b/src/Component/Constraints/PaymentTransportRelationValidator.php
index 12b0c8076..33b3a3959 100644
--- a/src/Component/Constraints/PaymentTransportRelationValidator.php
+++ b/src/Component/Constraints/PaymentTransportRelationValidator.php
@@ -26,7 +26,7 @@ public function __construct(
      * @param mixed $value
      * @param \Symfony\Component\Validator\Constraint $constraint
      */
-    public function validate($value, Constraint $constraint): void
+    public function validate(mixed $value, Constraint $constraint): void
     {
         if (!$constraint instanceof PaymentTransportRelation) {
             throw new UnexpectedTypeException($constraint, PaymentTransportRelation::class);
diff --git a/src/Component/Constraints/ProductInOrder.php b/src/Component/Constraints/ProductInOrder.php
index da20b400a..5c7471c27 100644
--- a/src/Component/Constraints/ProductInOrder.php
+++ b/src/Component/Constraints/ProductInOrder.php
@@ -14,9 +14,8 @@ class ProductInOrder extends Constraint
 
     /**
      * @var array<string, string>
-     * @phpcsSuppress SlevomatCodingStandard.TypeHints.PropertyTypeHint.MissingNativeTypeHint
      */
-    protected static $errorNames = [
+    protected const array ERROR_NAMES = [
         self::NO_PRODUCT_IN_ORDER_ERROR => 'NO_PRODUCT_IN_ORDER_ERROR',
     ];
 
diff --git a/src/Component/Constraints/ProductInOrderValidator.php b/src/Component/Constraints/ProductInOrderValidator.php
index a197a0bde..797c848e3 100644
--- a/src/Component/Constraints/ProductInOrderValidator.php
+++ b/src/Component/Constraints/ProductInOrderValidator.php
@@ -26,7 +26,7 @@ public function __construct(
      * @param mixed $value
      * @param \Shopsys\FrontendApiBundle\Component\Constraints\ProductInOrder $constraint
      */
-    public function validate($value, Constraint $constraint): void
+    public function validate(mixed $value, Constraint $constraint): void
     {
         if (!$constraint instanceof ProductInOrder) {
             throw new UnexpectedTypeException($constraint, ProductInOrder::class);
diff --git a/src/Component/Constraints/PromoCode.php b/src/Component/Constraints/PromoCode.php
index d381ab355..61ab23cf1 100644
--- a/src/Component/Constraints/PromoCode.php
+++ b/src/Component/Constraints/PromoCode.php
@@ -38,9 +38,8 @@ class PromoCode extends Constraint
 
     /**
      * @var array<string, string>
-     * @phpcsSuppress SlevomatCodingStandard.TypeHints.PropertyTypeHint.MissingNativeTypeHint
      */
-    protected static $errorNames = [
+    protected const array ERROR_NAMES = [
         self::INVALID_ERROR => 'INVALID_ERROR',
         self::NOT_YET_VALID_ERROR => 'NOT_YET_VALID_ERROR',
         self::NO_LONGER_VALID_ERROR => 'NO_LONGER_VALID_ERROR',
diff --git a/src/Component/Constraints/PromoCodeValidator.php b/src/Component/Constraints/PromoCodeValidator.php
index 24482d084..ecdc516f1 100644
--- a/src/Component/Constraints/PromoCodeValidator.php
+++ b/src/Component/Constraints/PromoCodeValidator.php
@@ -36,7 +36,7 @@ public function __construct(
      * @param mixed $value
      * @param \Symfony\Component\Validator\Constraint $constraint
      */
-    public function validate($value, Constraint $constraint)
+    public function validate(mixed $value, Constraint $constraint): void
     {
         if (!$constraint instanceof PromoCode) {
             throw new UnexpectedTypeException($constraint, PromoCode::class);
diff --git a/src/Component/Constraints/TransportInCart.php b/src/Component/Constraints/TransportInCart.php
index c8070a304..f4e5822a7 100644
--- a/src/Component/Constraints/TransportInCart.php
+++ b/src/Component/Constraints/TransportInCart.php
@@ -26,9 +26,8 @@ class TransportInCart extends Constraint
 
     /**
      * @var array<string, string>
-     * @phpcsSuppress SlevomatCodingStandard.TypeHints.PropertyTypeHint.MissingNativeTypeHint
      */
-    protected static $errorNames = [
+    protected const array ERROR_NAMES = [
         self::UNAVAILABLE_TRANSPORT_ERROR => 'UNAVAILABLE_TRANSPORT_ERROR',
         self::UNAVAILABLE_PICKUP_PLACE_ERROR => 'UNAVAILABLE_PICKUP_PLACE_ERROR',
         self::WEIGHT_LIMIT_EXCEEDED_ERROR => 'WEIGHT_LIMIT_EXCEEDED_ERROR',
diff --git a/src/Component/Constraints/TransportInCartValidator.php b/src/Component/Constraints/TransportInCartValidator.php
index c28589ca3..dfbd2aca1 100644
--- a/src/Component/Constraints/TransportInCartValidator.php
+++ b/src/Component/Constraints/TransportInCartValidator.php
@@ -42,7 +42,7 @@ public function __construct(
      * @param mixed $value
      * @param \Shopsys\FrontendApiBundle\Component\Constraints\TransportInCart $constraint
      */
-    public function validate($value, Constraint $constraint)
+    public function validate(mixed $value, Constraint $constraint): void
     {
         if (!$constraint instanceof TransportInCart) {
             throw new UnexpectedTypeException($constraint, TransportInCart::class);
diff --git a/src/Component/Constraints/TransportInOrder.php b/src/Component/Constraints/TransportInOrder.php
index b220403ca..59fdf1866 100644
--- a/src/Component/Constraints/TransportInOrder.php
+++ b/src/Component/Constraints/TransportInOrder.php
@@ -29,9 +29,8 @@ class TransportInOrder extends Constraint
 
     /**
      * @var array<string, string>
-     * @phpcsSuppress SlevomatCodingStandard.TypeHints.PropertyTypeHint.MissingNativeTypeHint
      */
-    protected static $errorNames = [
+    protected const array ERROR_NAMES = [
         self::TRANSPORT_NOT_SET_ERROR => 'TRANSPORT_NOT_SET_ERROR',
         self::TRANSPORT_UNAVAILABLE_ERROR => 'TRANSPORT_UNAVAILABLE_ERROR',
         self::CHANGED_TRANSPORT_PRICE_ERROR => 'CHANGED_TRANSPORT_PRICE_ERROR',
diff --git a/src/Component/Constraints/TransportInOrderValidator.php b/src/Component/Constraints/TransportInOrderValidator.php
index 1770b2183..eb08356db 100644
--- a/src/Component/Constraints/TransportInOrderValidator.php
+++ b/src/Component/Constraints/TransportInOrderValidator.php
@@ -34,7 +34,7 @@ public function __construct(
      * @param mixed $value
      * @param \Symfony\Component\Validator\Constraint $constraint
      */
-    public function validate($value, Constraint $constraint)
+    public function validate(mixed $value, Constraint $constraint): void
     {
         if (!$constraint instanceof TransportInOrder) {
             throw new UnexpectedTypeException($constraint, TransportInOrder::class);
diff --git a/src/Component/Constraints/UniqueBillingAddressApi.php b/src/Component/Constraints/UniqueBillingAddressApi.php
index a8e738944..b479a57fc 100644
--- a/src/Component/Constraints/UniqueBillingAddressApi.php
+++ b/src/Component/Constraints/UniqueBillingAddressApi.php
@@ -17,9 +17,8 @@ class UniqueBillingAddressApi extends Constraint
 
     /**
      * @var array<string, string>
-     * @phpcsSuppress SlevomatCodingStandard.TypeHints.PropertyTypeHint.MissingNativeTypeHint
      */
-    protected static $errorNames = [
+    protected const array ERROR_NAMES = [
         self::DUPLICATE_BILLING_ADDRESS => 'DUPLICATE_BILLING_ADDRESS',
     ];
 
diff --git a/src/Component/Constraints/UniqueBillingAddressApiValidator.php b/src/Component/Constraints/UniqueBillingAddressApiValidator.php
index 3881f7773..a00c57ef3 100644
--- a/src/Component/Constraints/UniqueBillingAddressApiValidator.php
+++ b/src/Component/Constraints/UniqueBillingAddressApiValidator.php
@@ -30,7 +30,7 @@ public function __construct(
      * @param mixed $value
      * @param \Symfony\Component\Validator\Constraint $constraint
      */
-    public function validate($value, Constraint $constraint)
+    public function validate(mixed $value, Constraint $constraint): void
     {
         if (!$constraint instanceof UniqueBillingAddressApi) {
             throw new UnexpectedTypeException($constraint, UniqueBillingAddressApi::class);
diff --git a/src/Voter/AbstractB2bVoter.php b/src/Voter/AbstractB2bVoter.php
index 2eab39ee0..5f0aeffee 100644
--- a/src/Voter/AbstractB2bVoter.php
+++ b/src/Voter/AbstractB2bVoter.php
@@ -22,8 +22,9 @@ public function __construct(protected readonly Domain $domain)
     /**
      * @param string $attribute
      * @param array $subject
+     * @return bool
      */
-    abstract protected function supports(string $attribute, $subject);
+    abstract protected function supports(string $attribute, $subject): bool;
 
     /**
      * @param string $attribute
@@ -36,8 +37,9 @@ abstract protected function checkAccess(string $attribute, ?Argument $argument,
      * @param string $attribute
      * @param mixed $subject
      * @param \Symfony\Component\Security\Core\Authentication\Token\TokenInterface $token
+     * @return bool
      */
-    protected function voteOnAttribute(string $attribute, $subject, TokenInterface $token)
+    protected function voteOnAttribute(string $attribute, $subject, TokenInterface $token): bool
     {
         if ($this->domain->isB2b() === false) {
             return false;
diff --git a/src/Voter/CompanyOwnerVoter.php b/src/Voter/CompanyOwnerVoter.php
index b7d79d94f..a9938282b 100644
--- a/src/Voter/CompanyOwnerVoter.php
+++ b/src/Voter/CompanyOwnerVoter.php
@@ -29,8 +29,9 @@ public function __construct(
     /**
      * @param string $attribute
      * @param mixed $subject
+     * @return bool
      */
-    protected function supports(string $attribute, $subject)
+    protected function supports(string $attribute, $subject): bool
     {
         return $attribute === 'is_company_owner_voter';
     }