diff --git a/composer.json b/composer.json
index 80659a4..55d8c96 100644
--- a/composer.json
+++ b/composer.json
@@ -22,8 +22,8 @@
         "roave/security-advisories": "dev-latest",
         "phpunit/phpunit": "^8.5 || ^9.0",
         "doctrine/annotations": "^1.2",
-        "symfony/framework-bundle": "^5.0 || ^6.0",
-        "symfony/yaml": "^5.0 || ^6.0"
+        "symfony/framework-bundle": "^5.0 || ^6.0 || ^7.0",
+        "symfony/yaml": "^5.0 || ^6.0 || ^7.0"
     },
     "autoload": {
         "psr-4": {
diff --git a/src/DependencyInjection/DdeboerVatinExtension.php b/src/DependencyInjection/DdeboerVatinExtension.php
index 033478f..cb2de8d 100644
--- a/src/DependencyInjection/DdeboerVatinExtension.php
+++ b/src/DependencyInjection/DdeboerVatinExtension.php
@@ -17,7 +17,7 @@ class DdeboerVatinExtension extends Extension
     /**
      * {@inheritDoc}
      */
-    public function load(array $configs, ContainerBuilder $container)
+    public function load(array $configs, ContainerBuilder $container): void
     {
         $loader = new Loader\XmlFileLoader($container, new FileLocator(__DIR__ . '/../Resources/config'));
         $loader->load('services.xml');
diff --git a/src/Validator/Constraints/VatinValidator.php b/src/Validator/Constraints/VatinValidator.php
index 45516ae..1e7df4a 100644
--- a/src/Validator/Constraints/VatinValidator.php
+++ b/src/Validator/Constraints/VatinValidator.php
@@ -34,7 +34,7 @@ public function __construct(Validator $validator)
     /**
      * {@inheritdoc}
      */
-    public function validate($value, Constraint $constraint)
+    public function validate($value, Constraint $constraint): void
     {
         if (null === $value || '' === $value) {
             return;
@@ -56,7 +56,7 @@ public function validate($value, Constraint $constraint)
      *
      * @return bool
      */
-    private function isValidVatin($value, $checkExistence)
+    private function isValidVatin($value, $checkExistence): bool
     {
         try {
             return $this->validator->isValid($value, $checkExistence);
diff --git a/tests/Functional/Model.php b/tests/Functional/Model.php
index b82cc1f..b22b64c 100644
--- a/tests/Functional/Model.php
+++ b/tests/Functional/Model.php
@@ -9,10 +9,12 @@ class Model
     /**
      * @Vatin
      */
+    #[Vatin]
     public $vat;
 
     /**
      * @Vatin(checkExistence=true)
      */
+    #[Vatin(checkExistence: true)]
     public $vatCheckExistence;
 }
diff --git a/tests/Functional/app/AppKernel.php b/tests/Functional/app/AppKernel.php
index dfb3328..f246373 100644
--- a/tests/Functional/app/AppKernel.php
+++ b/tests/Functional/app/AppKernel.php
@@ -15,6 +15,10 @@ public function registerBundles(): iterable
 
     public function registerContainerConfiguration(LoaderInterface $loader)
     {
-        $loader->load(__DIR__.'/config/config.yml');
+        if (self::MAJOR_VERSION >= 7) {
+            $loader->load(__DIR__ . '/config/config_7.yml');
+        } else {
+            $loader->load(__DIR__ . '/config/config.yml');
+        }
     }
 }
diff --git a/tests/Functional/app/config/config_7.yml b/tests/Functional/app/config/config_7.yml
new file mode 100644
index 0000000..d033f8f
--- /dev/null
+++ b/tests/Functional/app/config/config_7.yml
@@ -0,0 +1,10 @@
+framework:
+  secret: ddeboer
+  test: ~
+  validation:
+    enable_attributes: true
+
+services:
+  test.validator:
+    alias: validator
+    public: true
diff --git a/tests/Validator/Constraints/ValidatorTest.php b/tests/Validator/Constraints/ValidatorTest.php
index f6761ca..9231e81 100644
--- a/tests/Validator/Constraints/ValidatorTest.php
+++ b/tests/Validator/Constraints/ValidatorTest.php
@@ -5,11 +5,12 @@
 use Ddeboer\Vatin\Validator;
 use Ddeboer\VatinBundle\Validator\Constraints\Vatin;
 use Ddeboer\VatinBundle\Validator\Constraints\VatinValidator;
+use Symfony\Component\Validator\ConstraintValidatorInterface;
 use Symfony\Component\Validator\Test\ConstraintValidatorTestCase;
 
 class ValidatorTest extends ConstraintValidatorTestCase
 {
-    protected function createValidator()
+    protected function createValidator(): ConstraintValidatorInterface
     {
         return new VatinValidator(new Validator());
     }