diff --git a/.github/workflows/code_checks.yml b/.github/workflows/code_checks.yml
new file mode 100644
index 0000000..e9e6c58
--- /dev/null
+++ b/.github/workflows/code_checks.yml
@@ -0,0 +1,37 @@
+# .github/workflows/code_checks.yaml
+name: Code_Checks
+
+on: ["push", "pull_request"]
+
+jobs:
+  tests:
+    runs-on: ubuntu-latest
+    strategy:
+      fail-fast: false
+      matrix:
+        php: ['7.2', '7.3', '7.4', '8.0', '8.1']
+        stability: [ prefer-lowest, prefer-stable ]
+
+    name: PHP ${{ matrix.php }} - ${{ matrix.stability }} tests
+    steps:
+      # basically git clone
+      - uses: actions/checkout@v2
+
+      - name: Cache dependencies
+        uses: actions/cache@v1
+        with:
+          path: ~/.composer/cache/files
+          key: dependencies-php-${{ matrix.php }}-composer-${{ hashFiles('composer.json') }}
+
+      # use PHP of specific version
+      - uses: shivammathur/setup-php@v2
+        with:
+          php-version: ${{ matrix.php }}
+          extensions: pcov
+          coverage: pcov
+
+      - name: Install dependencies
+        run: composer update --${{ matrix.stability }} --prefer-dist --no-interaction
+
+      - name: Execute tests
+        run: vendor/bin/phpunit --verbose
diff --git a/.gitignore b/.gitignore
index d575ea2..e946f56 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,4 +1,7 @@
 vendor/
+var/
 composer.lock
 Tests/Functional/app/cache
 .idea
+.phpunit.result.cache
+.github/
\ No newline at end of file
diff --git a/.travis.yml b/.travis.yml
deleted file mode 100644
index 92ddf87..0000000
--- a/.travis.yml
+++ /dev/null
@@ -1,16 +0,0 @@
-sudo: false
-
-language: php
-
-php:
-  - 7.2
-  - 7.3
-
-matrix:
-  include:
-    - php: 7.2
-      env: COMPOSER_FLAGS="--prefer-lowest"
-
-install: composer update --prefer-dist --no-interaction $COMPOSER_FLAGS
-
-script: vendor/bin/phpunit --coverage-text
diff --git a/DependencyInjection/DdeboerVatinExtension.php b/DependencyInjection/DdeboerVatinExtension.php
index e54d594..158c8e8 100644
--- a/DependencyInjection/DdeboerVatinExtension.php
+++ b/DependencyInjection/DdeboerVatinExtension.php
@@ -10,7 +10,7 @@
 /**
  * This is the class that loads and manages your bundle configuration
  *
- * To learn more see {@link http://symfony.com/doc/current/cookbook/bundles/extension.html}
+ * To learn more see {@link https://symfony.com/doc/current/cookbook/bundles/extension.html}
  */
 class DdeboerVatinExtension extends Extension
 {
diff --git a/README.md b/README.md
index e1563f9..01e7373 100644
--- a/README.md
+++ b/README.md
@@ -16,18 +16,18 @@ $ composer require ddeboer/vatin-bundle
 
 Then add the bundle to your application:
 
+If you don't use [Symfony Flex](https://symfony.com/doc/current/setup/flex.html), you must enable the bundle manually in the application:
+
 ```php
-// app/AppKernel.php
-public function registerBundles()
-{
-    return [
-        ...
-        new Ddeboer\VatinBundle\DdeboerVatinBundle(),
-        ...
-    ];
-}
+// config/bundles.php
+// in older Symfony apps, enable the bundle in app/AppKernel.php
+return [
+    // ...
+    Ddeboer\VatinBundle\DdeboerVatinBundle::class => ['all' => true],
+];
 ```
 
+
 Usage
 -----
 
@@ -48,7 +48,7 @@ class Company
 ```
 
 Symfony’s validator will now check whether `$vatNumber` has a valid VAT number
-format. For more information, see [Symfony’s documentation](http://symfony.com/doc/current/book/validation.html).
+format. For more information, see [Symfony’s documentation](https://symfony.com/doc/current/book/validation.html).
 
 ### Validate number existence
 
@@ -61,8 +61,16 @@ Additionally, you can check whether the VAT number is in use:
     protected $vatNumber;
 ```
 
+```php
+    /**
+     * PHP 8 Attribute  
+     */
+    #[Vatin(checkExistence: true)]
+    protected $vatNumber;
+```
+
 The validator will now check the VAT number against the
-[VAT Information Exchange System (VIES)](http://ec.europa.eu/taxation_customs/vies/faq.html)
+[VAT Information Exchange System (VIES)](https://ec.europa.eu/taxation_customs/vies/faq.html)
 SOAP web service. This service’s availability is rather unreliable, so it’s a
 good idea to catch the case where it’s unreachable:
 
diff --git a/Tests/Functional/ValidatorAnnotationTest.php b/Tests/Functional/ValidatorAnnotationTest.php
index c60df61..1a75283 100644
--- a/Tests/Functional/ValidatorAnnotationTest.php
+++ b/Tests/Functional/ValidatorAnnotationTest.php
@@ -14,32 +14,49 @@ class ValidatorAnnotationTest extends WebTestCase
      */
     private $validator;
 
-    protected function setUp()
+    protected function setUp(): void
     {
         static::bootKernel();
         $container = static::$kernel->getContainer();
         $this->validator = $container->get('validator');
     }
 
+    /**
+     * @requires PHP 8.0
+     */
     public function testValid()
     {
         $model = new Model();
         $errors = $this->validator->validate($model);
-        $this->assertEquals(0, count($errors));
+        $this->assertCount(0, $errors);
 
         $model->vat = 'NL123456789B01';
         $this->assertCount(0, $this->validator->validate($model));
     }
 
+    /**
+     * @requires PHP 8.0
+     */
     public function testCheckExistence()
     {
         $model = new Model();
+        # invalid value
         $model->vatCheckExistence = '123';
-        $this->assertCount(1, $this->validator->validate($model));
+        try {
+            $this->assertCount(0, $this->validator->validate($model));
+        } catch (ValidatorException $e) {
+            if (!$e->getPrevious() instanceof ViesException) {
+                throw $e;
+            }
+
+            // Ignore unreachable VIES service: at least the check was triggered
+        }
+
 
+        # valid value
         $model->vatCheckExistence = 'NL123456789B01';
         try {
-            $this->assertCount(1, $this->validator->validate($model));
+            $this->assertCount(0, $this->validator->validate($model));
         } catch (ValidatorException $e) {
             if (!$e->getPrevious() instanceof ViesException) {
                 throw $e;
diff --git a/Tests/Functional/app/AppKernel.php b/Tests/Functional/app/AppKernel.php
index 7125ab3..29f8b88 100644
--- a/Tests/Functional/app/AppKernel.php
+++ b/Tests/Functional/app/AppKernel.php
@@ -5,7 +5,7 @@
 
 class AppKernel extends Kernel
 {
-    public function registerBundles()
+    public function registerBundles(): array
     {
         return [
             new \Symfony\Bundle\FrameworkBundle\FrameworkBundle(),
diff --git a/Tests/Functional/app/autoload.php b/Tests/Functional/app/autoload.php
index 8a62af0..8f781ab 100644
--- a/Tests/Functional/app/autoload.php
+++ b/Tests/Functional/app/autoload.php
@@ -1,12 +1,5 @@
 <?php
 
-use Doctrine\Common\Annotations\AnnotationRegistry;
-use Composer\Autoload\ClassLoader;
-
-/** @var ClassLoader $loader */
-$loader = require __DIR__.'/../../../vendor/autoload.php';
-AnnotationRegistry::registerLoader([$loader, 'loadClass']);
+require dirname(__DIR__).'/../../vendor/autoload.php';
 
 require_once __DIR__.'/AppKernel.php';
-
-return $loader;
\ No newline at end of file
diff --git a/Tests/Validator/Constraints/ValidatorTest.php b/Tests/Validator/Constraints/ValidatorTest.php
index 425c4e3..91e72f8 100644
--- a/Tests/Validator/Constraints/ValidatorTest.php
+++ b/Tests/Validator/Constraints/ValidatorTest.php
@@ -7,14 +7,9 @@
 use Ddeboer\Vatin\Validator;
 use Symfony\Component\Validator\Test\ConstraintValidatorTestCase;
 
-// BC for Symfony 2 and Symfony 4. To be removed when support for Symfony 2 is dropped
-if (!class_exists('Symfony\Component\Validator\Test\ConstraintValidatorTestCase')) {
-    class_alias('Symfony\Component\Validator\Tests\Constraints\AbstractConstraintValidatorTest', 'Symfony\Component\Validator\Test\ConstraintValidatorTestCase');
-}
-
 class ValidatorTest extends ConstraintValidatorTestCase
 {
-    protected function createValidator()
+    protected function createValidator(): VatinValidator
     {
         return new VatinValidator(new Validator());
     }
diff --git a/Validator/Constraints/Vatin.php b/Validator/Constraints/Vatin.php
index 77cbf92..5ed3631 100644
--- a/Validator/Constraints/Vatin.php
+++ b/Validator/Constraints/Vatin.php
@@ -41,7 +41,7 @@ public function __construct(
         parent::__construct($options ?? [], $groups, $payload);
     }
 
-    public function validatedBy()
+    public function validatedBy(): string
     {
         return 'ddeboer_vatin.validator';
     }
diff --git a/Validator/Constraints/VatinValidator.php b/Validator/Constraints/VatinValidator.php
index 45516ae..01ecb57 100644
--- a/Validator/Constraints/VatinValidator.php
+++ b/Validator/Constraints/VatinValidator.php
@@ -10,7 +10,6 @@
 
 /**
  * Validate a VAT identification number using the ddeboer/vatin library
- *
  */
 class VatinValidator extends ConstraintValidator
 {
@@ -23,8 +22,6 @@ class VatinValidator extends ConstraintValidator
 
     /**
      * Constructor
-     *
-     * @param Validator $validator VATIN validator
      */
     public function __construct(Validator $validator)
     {
@@ -40,23 +37,26 @@ public function validate($value, Constraint $constraint)
             return;
         }
 
-        if ($this->isValidVatin($value, $constraint->checkExistence)) {
-            return;
-        }
+        try {
+            #var_dump('Check '.$value. ' '.$constraint->checkExistence);
+            if ($this->isValidVatin($value, $constraint->checkExistence)) {
+                return;
+            }
 
-        $this->context->buildViolation($constraint->message)
-            ->addViolation();
+            $this->context->buildViolation($constraint->message)->addViolation();
+        }
+        catch (\Exception $e)
+        {
+         #var_dump($e->getMessage());
+         #var_dump("error build violation for ".$value);
+         $this->context->buildViolation($constraint->message)->addViolation();
+        }
     }
 
     /**
      * Is the value a valid VAT identification number?
-     *
-     * @param string $value          Value
-     * @param bool   $checkExistence Also check whether the VAT number exists
-     *
-     * @return bool
      */
-    private function isValidVatin($value, $checkExistence)
+    private function isValidVatin(string $value, bool $checkExistence): bool
     {
         try {
             return $this->validator->isValid($value, $checkExistence);
diff --git a/composer.json b/composer.json
index ce826bd..7a7fc78 100644
--- a/composer.json
+++ b/composer.json
@@ -11,14 +11,18 @@
         }
     ],
     "require": {
-        "ddeboer/vatin": "^2.0",
-        "symfony/framework-bundle": "^3.4.26 || ^4.1.12 || ^5.0",
-        "symfony/validator": "^3.0 || ^4.0 || ^5.0"
+        "php": "^7.2 || ^8.0",
+        "ddeboer/vatin": "^2.2.2",
+        "symfony/framework-bundle": "^4.4.31 || ^5.3",
+        "symfony/validator": "^4.4.31 || ^5.3"
     },
     "require-dev": {
-        "phpunit/phpunit": "^4.0 || ^5.0",
-        "doctrine/annotations": "^1.2",
-        "symfony/yaml": "^2.7 || ^3.0 || ^4.0 || ^5.0"
+        "phpunit/phpunit": "^8.5.21 || ^9.5",
+        "doctrine/annotations": "^1.13.2",
+        "symfony/yaml": "^4.4.31 || ^5.3",
+        "symfony/dependency-injection": "^4.4.31 || ^5.3",
+        "symfony/config": "^4.4.31 || ^5.3",
+        "symfony/error-handler": "^4.4.31 || ^5.3"
     },
     "autoload": {
         "psr-4": {
diff --git a/phpunit.xml.dist b/phpunit.xml.dist
index 040fcd5..100bab6 100644
--- a/phpunit.xml.dist
+++ b/phpunit.xml.dist
@@ -1,31 +1,31 @@
 <?xml version="1.0" encoding="UTF-8"?>
-
-<phpunit bootstrap="./Tests/Functional/app/autoload.php"
+<phpunit xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         bootstrap="./Tests/Functional/app/autoload.php"
          colors="true"
          convertErrorsToExceptions="true"
          convertNoticesToExceptions="true"
          convertWarningsToExceptions="true"
-         syntaxCheck="true">
-    <testsuites>
-        <testsuite name="ddeboer/vatin-bundle test suite">
-            <directory suffix="Test.php">./Tests</directory>
-        </testsuite>
-    </testsuites>
-
-    <filter>
-        <whitelist>
-            <directory>./</directory>
-            <exclude>
-                <directory>./Resources</directory>
-                <directory>./Tests</directory>
-                <directory>./vendor</directory>
-            </exclude>
-        </whitelist>
-    </filter>
-
-    <php>
-        <server name="KERNEL_DIR" value="./Tests/Functional/app"/>
-        <server name="KERNEL_CLASS" value="AppKernel"/>
-        <ini name="default_socket_timeout" value="3"/>
-    </php>
-</phpunit>
\ No newline at end of file
+         xsi:noNamespaceSchemaLocation="https://schema.phpunit.de/9.3/phpunit.xsd">
+  <coverage>
+    <include>
+      <directory suffix=".php">./</directory>
+    </include>
+    <exclude>
+      <directory>./github</directory>
+      <directory>./Resources</directory>
+      <directory>./Tests</directory>
+      <directory>./var</directory>
+      <directory>./vendor</directory>
+    </exclude>
+  </coverage>
+  <testsuites>
+    <testsuite name="ddeboer/vatin-bundle test suite">
+      <directory suffix="Test.php">./Tests</directory>
+    </testsuite>
+  </testsuites>
+  <php>
+    <server name="KERNEL_DIR" value="./Tests/Functional/app"/>
+    <server name="KERNEL_CLASS" value="AppKernel"/>
+    <ini name="default_socket_timeout" value="3"/>
+  </php>
+</phpunit>