diff --git a/.gitattributes b/.gitattributes
index 0af6e4d..8d81342 100644
--- a/.gitattributes
+++ b/.gitattributes
@@ -8,6 +8,5 @@
 .gitattributes    export-ignore
 .gitignore        export-ignore
 .scrutinizer.yml  export-ignore
-.travis.yml       export-ignore
 phpunit.xml.dist  export-ignore
 CONTRIBUTING.md   export-ignore
diff --git a/.github/workflows/run-tests.yml b/.github/workflows/run-tests.yml
new file mode 100644
index 0000000..10b997e
--- /dev/null
+++ b/.github/workflows/run-tests.yml
@@ -0,0 +1,46 @@
+name: run-tests
+
+on: [push]
+
+jobs:
+  tests:
+    runs-on: ubuntu-latest
+
+    strategy:
+      fail-fast: true
+      matrix:
+        php: [7.2, 7.3, 7.4]
+        laravel: [6.*]
+        dependency-version: [prefer-lowest, prefer-stable]
+
+    name: PHP ${{ matrix.php }} - ${{ matrix.dependency-version }}
+
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v1
+
+      - name: Cache dependencies
+        uses: actions/cache@v1
+        with:
+          path: ~/.composer/cache/files
+          key: dependencies-laravel-${{ matrix.laravel }}-php-${{ matrix.php }}-composer-${{ hashFiles('composer.json') }}
+
+      - name: Setup PHP
+        uses: shivammathur/setup-php@v1
+        with:
+          php-version: ${{ matrix.php }}
+          extensions: curl, mbstring, zip, pcntl, pdo, sqlite, pdo_sqlite, iconv
+          coverage: xdebug
+
+      - name: Install dependencies
+        run: composer update --${{ matrix.dependency-version }} --prefer-dist --no-interaction --no-suggest
+
+      - name: Execute tests
+        run: |
+          mkdir -p build/logs
+          vendor/bin/phpunit --coverage-text --coverage-clover=coverage.clover
+
+      - name: Scrutinizer CI
+        run: |
+          wget https://scrutinizer-ci.com/ocular.phar
+          php ocular.phar code-coverage:upload --format=php-clover coverage.clover
diff --git a/.scrutinizer.yml b/.scrutinizer.yml
index d44a72f..8a9285f 100644
--- a/.scrutinizer.yml
+++ b/.scrutinizer.yml
@@ -22,7 +22,7 @@ checks:
 tools:
     external_code_coverage:
         timeout: 600
-        runs: 2
+        runs: 6
     php_code_sniffer:
         enabled: true
         config:
diff --git a/.travis.yml b/.travis.yml
deleted file mode 100644
index 0d5796f..0000000
--- a/.travis.yml
+++ /dev/null
@@ -1,25 +0,0 @@
-language: php
-
-sudo: false
-
-php:
-  - 7.2
-  - 7.3
-  - nightly
-
-matrix:
-  allow_failures:
-    - php: nightly
-
-before_script:
-  - travis_retry composer self-update
-  - travis_retry composer install --prefer-source --no-interaction
-
-script:
-  - composer validate
-  - mkdir -p build/logs
-  - ./vendor/bin/phpunit --coverage-text --coverage-clover=coverage.clover
-
-after_script:
-  - if [ "$TRAVIS_PHP_VERSION" != "nightly" ]; then wget https://scrutinizer-ci.com/ocular.phar; fi
-  - if [ "$TRAVIS_PHP_VERSION" != "nightly" ]; then php ocular.phar code-coverage:upload --format=php-clover coverage.clover; fi
diff --git a/README.md b/README.md
index 815bc87..8d95439 100644
--- a/README.md
+++ b/README.md
@@ -1,6 +1,6 @@
 # noCAPTCHA (new reCAPTCHA) [![Packagist License][badge_license]](LICENSE.md) [![For PHP][badge_php]][link-github-repo]
 
-[![Travis Status][badge_build]][link-travis]
+[![Github Workflow Status][badge_build]][link-github-status]
 [![Coverage Status][badge_coverage]][link-scrutinizer]
 [![Scrutinizer Code Quality][badge_quality]][link-scrutinizer]
 [![SensioLabs Insight][badge_insight]][link-insight]
@@ -55,7 +55,7 @@ If you discover any security related issues, please email arcanedev.maroc@gmail.
 
 [badge_php]:          https://img.shields.io/badge/PHP-Framework%20agnostic-4F5B93.svg?style=flat-square
 [badge_license]:      https://img.shields.io/packagist/l/arcanedev/no-captcha.svg?style=flat-square
-[badge_build]:        https://img.shields.io/travis/ARCANEDEV/noCAPTCHA.svg?style=flat-square
+[badge_build]:       https://img.shields.io/github/workflow/status/ARCANEDEV/noCAPTCHA/run-tests?style=flat-square
 [badge_coverage]:     https://img.shields.io/scrutinizer/coverage/g/ARCANEDEV/noCAPTCHA.svg?style=flat-square
 [badge_quality]:      https://img.shields.io/scrutinizer/g/ARCANEDEV/noCAPTCHA.svg?style=flat-square
 [badge_insight]:      https://img.shields.io/sensiolabs/i/ae37b4c0-5478-4afb-9a71-1fe5534d8ef5.svg?style=flat-square
@@ -65,10 +65,10 @@ If you discover any security related issues, please email arcanedev.maroc@gmail.
 [badge_downloads]:    https://img.shields.io/packagist/dt/arcanedev/no-captcha.svg?style=flat-square
 
 [link-author]:        https://github.com/arcanedev-maroc
+[link-github-status]: https://github.com/ARCANEDEV/noCAPTCHA/actions
 [link-github-repo]:   https://github.com/ARCANEDEV/noCAPTCHA
 [link-github-issues]: https://github.com/ARCANEDEV/noCAPTCHA/issues
 [link-contributors]:  https://github.com/ARCANEDEV/noCAPTCHA/graphs/contributors
 [link-packagist]:     https://packagist.org/packages/arcanedev/no-captcha
-[link-travis]:        https://travis-ci.org/ARCANEDEV/noCAPTCHA
 [link-scrutinizer]:   https://scrutinizer-ci.com/g/ARCANEDEV/noCAPTCHA/?branch=master
 [link-insight]:       https://insight.sensiolabs.com/projects/ae37b4c0-5478-4afb-9a71-1fe5534d8ef5
diff --git a/composer.json b/composer.json
index 51704e3..0779173 100644
--- a/composer.json
+++ b/composer.json
@@ -18,11 +18,11 @@
         "ext-curl":           "*",
         "ext-json":           "*",
         "arcanedev/php-html": "^3.0",
-        "arcanedev/support":  "^5.0",
+        "arcanedev/support":  "^5.1",
         "psr/http-message":   "^1.0"
     },
     "require-dev": {
-        "orchestra/testbench":    "^4.0",
+        "orchestra/testbench":    "^4.5",
         "phpunit/phpunit":        "^8.0",
         "phpunit/phpcov":         "^6.0"
     },
diff --git a/src/AbstractNoCaptcha.php b/src/AbstractNoCaptcha.php
index 718eca8..82760a3 100644
--- a/src/AbstractNoCaptcha.php
+++ b/src/AbstractNoCaptcha.php
@@ -1,4 +1,8 @@
-<?php namespace Arcanedev\NoCaptcha;
+<?php
+
+declare(strict_types=1);
+
+namespace Arcanedev\NoCaptcha;
 
 use Arcanedev\NoCaptcha\Utilities\Request;
 use Illuminate\Support\HtmlString;
@@ -243,7 +247,7 @@ public function verifyRequest(ServerRequestInterface $request)
      *
      * @param  array  $query
      *
-     * @return \Arcanedev\NoCaptcha\Utilities\ResponseV3
+     * @return \Arcanedev\NoCaptcha\Contracts\Utilities\Response
      */
     protected function sendVerifyRequest(array $query = [])
     {
@@ -260,7 +264,7 @@ protected function sendVerifyRequest(array $query = [])
      *
      * @param  string  $json
      *
-     * @return \Arcanedev\NoCaptcha\Utilities\AbstractResponse|mixed
+     * @return \Arcanedev\NoCaptcha\Contracts\Utilities\Response|mixed
      */
     abstract protected function parseResponse($json);
 
@@ -285,7 +289,7 @@ protected function hasLang()
      * @param  string  $name
      * @param  string  $value
      */
-    private static function checkKey($name, &$value)
+    private static function checkKey($name, &$value): void
     {
         self::checkIsString($name, $value);
 
@@ -302,7 +306,7 @@ private static function checkKey($name, &$value)
      *
      * @throws \Arcanedev\NoCaptcha\Exceptions\ApiException
      */
-    private static function checkIsString($name, $value)
+    private static function checkIsString($name, $value): void
     {
         if ( ! is_string($value)) {
             throw new Exceptions\ApiException(
@@ -319,7 +323,7 @@ private static function checkIsString($name, $value)
      *
      * @throws \Arcanedev\NoCaptcha\Exceptions\ApiException
      */
-    private static function checkIsNotEmpty($name, $value)
+    private static function checkIsNotEmpty($name, $value): void
     {
         if (empty($value)) {
             throw new Exceptions\ApiException("The {$name} must not be empty");
diff --git a/src/Contracts/NoCaptcha.php b/src/Contracts/NoCaptcha.php
index 488112e..5d06ad7 100644
--- a/src/Contracts/NoCaptcha.php
+++ b/src/Contracts/NoCaptcha.php
@@ -1,4 +1,8 @@
-<?php namespace Arcanedev\NoCaptcha\Contracts;
+<?php
+
+declare(strict_types=1);
+
+namespace Arcanedev\NoCaptcha\Contracts;
 
 use Arcanedev\NoCaptcha\Contracts\Utilities\Request;
 
diff --git a/src/Contracts/NoCaptchaManager.php b/src/Contracts/NoCaptchaManager.php
index 73b01e5..85ae49d 100644
--- a/src/Contracts/NoCaptchaManager.php
+++ b/src/Contracts/NoCaptchaManager.php
@@ -1,4 +1,8 @@
-<?php namespace Arcanedev\NoCaptcha\Contracts;
+<?php
+
+declare(strict_types=1);
+
+namespace Arcanedev\NoCaptcha\Contracts;
 
 /**
  * Interface     NoCaptchaManager
diff --git a/src/Contracts/Utilities/Request.php b/src/Contracts/Utilities/Request.php
index f5c9125..46824ee 100644
--- a/src/Contracts/Utilities/Request.php
+++ b/src/Contracts/Utilities/Request.php
@@ -1,4 +1,8 @@
-<?php namespace Arcanedev\NoCaptcha\Contracts\Utilities;
+<?php
+
+declare(strict_types=1);
+
+namespace Arcanedev\NoCaptcha\Contracts\Utilities;
 
 /**
  * Interface  RequestInterface
diff --git a/src/Contracts/Utilities/Response.php b/src/Contracts/Utilities/Response.php
index f8c7854..fca4aa3 100644
--- a/src/Contracts/Utilities/Response.php
+++ b/src/Contracts/Utilities/Response.php
@@ -1,4 +1,8 @@
-<?php namespace Arcanedev\NoCaptcha\Contracts\Utilities;
+<?php
+
+declare(strict_types=1);
+
+namespace Arcanedev\NoCaptcha\Contracts\Utilities;
 
 use Illuminate\Contracts\Support\Arrayable;
 use Illuminate\Contracts\Support\Jsonable;
diff --git a/src/Exceptions/ApiException.php b/src/Exceptions/ApiException.php
index 0e53166..e82103e 100644
--- a/src/Exceptions/ApiException.php
+++ b/src/Exceptions/ApiException.php
@@ -1,4 +1,8 @@
-<?php namespace Arcanedev\NoCaptcha\Exceptions;
+<?php
+
+declare(strict_types=1);
+
+namespace Arcanedev\NoCaptcha\Exceptions;
 
 /**
  * Class     ApiException
diff --git a/src/Exceptions/InvalidArgumentException.php b/src/Exceptions/InvalidArgumentException.php
index a876073..8e91a96 100644
--- a/src/Exceptions/InvalidArgumentException.php
+++ b/src/Exceptions/InvalidArgumentException.php
@@ -1,4 +1,8 @@
-<?php namespace Arcanedev\NoCaptcha\Exceptions;
+<?php
+
+declare(strict_types=1);
+
+namespace Arcanedev\NoCaptcha\Exceptions;
 
 /**
  * Class     InvalidArgumentException
diff --git a/src/Exceptions/InvalidUrlException.php b/src/Exceptions/InvalidUrlException.php
index 7350772..7bc2e4a 100644
--- a/src/Exceptions/InvalidUrlException.php
+++ b/src/Exceptions/InvalidUrlException.php
@@ -1,4 +1,8 @@
-<?php namespace Arcanedev\NoCaptcha\Exceptions;
+<?php
+
+declare(strict_types=1);
+
+namespace Arcanedev\NoCaptcha\Exceptions;
 
 /**
  * Class     InvalidUrlException
diff --git a/src/Exceptions/NoCaptchaException.php b/src/Exceptions/NoCaptchaException.php
index 3e9a427..12530e7 100644
--- a/src/Exceptions/NoCaptchaException.php
+++ b/src/Exceptions/NoCaptchaException.php
@@ -1,4 +1,8 @@
-<?php namespace Arcanedev\NoCaptcha\Exceptions;
+<?php
+
+declare(strict_types=1);
+
+namespace Arcanedev\NoCaptcha\Exceptions;
 
 /**
  * Class     NoCaptchaException
diff --git a/src/NoCaptchaManager.php b/src/NoCaptchaManager.php
index 1aa82fd..0e968d8 100644
--- a/src/NoCaptchaManager.php
+++ b/src/NoCaptchaManager.php
@@ -1,4 +1,8 @@
-<?php namespace Arcanedev\NoCaptcha;
+<?php
+
+declare(strict_types=1);
+
+namespace Arcanedev\NoCaptcha;
 
 use Illuminate\Support\Manager;
 use Arcanedev\NoCaptcha\Contracts\{
@@ -96,6 +100,6 @@ protected function buildDriver(string $driver): NoCaptchaContract
      */
     protected function config(string $key = '')
     {
-        return $this->container['config']->get("no-captcha.{$key}");
+        return $this->config->get("no-captcha.{$key}");
     }
 }
diff --git a/src/NoCaptchaServiceProvider.php b/src/NoCaptchaServiceProvider.php
index 310a0f5..50a355d 100644
--- a/src/NoCaptchaServiceProvider.php
+++ b/src/NoCaptchaServiceProvider.php
@@ -1,4 +1,8 @@
-<?php namespace Arcanedev\NoCaptcha;
+<?php
+
+declare(strict_types=1);
+
+namespace Arcanedev\NoCaptcha;
 
 use Arcanedev\Support\Providers\PackageServiceProvider as ServiceProvider;
 use Illuminate\Contracts\Foundation\Application;
diff --git a/src/NoCaptchaV2.php b/src/NoCaptchaV2.php
index 4be2ef7..69204b0 100644
--- a/src/NoCaptchaV2.php
+++ b/src/NoCaptchaV2.php
@@ -1,7 +1,10 @@
-<?php namespace Arcanedev\NoCaptcha;
+<?php
 
-use Arcanedev\Html\Elements\Button;
-use Arcanedev\Html\Elements\Div;
+declare(strict_types=1);
+
+namespace Arcanedev\NoCaptcha;
+
+use Arcanedev\Html\Elements\{Button, Div};
 use Arcanedev\NoCaptcha\Exceptions\InvalidArgumentException;
 use Arcanedev\NoCaptcha\Utilities\ResponseV2;
 use Illuminate\Support\Arr;
@@ -154,7 +157,7 @@ public function getApiScript()
                     captchas: [],
                     reset: function(name) {
                         var captcha = window.noCaptcha.get(name);
-        
+
                         if (captcha)
                             window.noCaptcha.resetById(captcha.id);
                     },
@@ -179,9 +182,9 @@ public function getApiScript()
                             id: grecaptcha.render(name, {'sitekey' : sitekey}),
                             name: name
                         };
-                        
+
                         window.noCaptcha.captchas.push(captcha);
-                        
+
                         return captcha;
                     }
                 }
@@ -223,7 +226,7 @@ public function scriptWithCallback(array $captchas, $callbackName = 'captchaRend
      *
      * @return string
      */
-    private function renderCaptchas(array $captchas)
+    private function renderCaptchas(array $captchas): string
     {
         return implode(PHP_EOL, array_map(function($captcha) {
             return "if (document.getElementById('{$captcha}')) { window.noCaptcha.render('{$captcha}', '{$this->siteKey}'); }";
@@ -242,7 +245,7 @@ private function renderCaptchas(array $captchas)
      *
      * @return bool
      */
-    private function hasCallbackName($callbackName)
+    private function hasCallbackName($callbackName): bool
     {
         return ! (is_null($callbackName) || trim($callbackName) === '');
     }
@@ -271,7 +274,7 @@ protected function parseResponse($json)
      *
      * @return array
      */
-    private function prepareAttributes(array $attributes)
+    private function prepareAttributes(array $attributes): array
     {
         $attributes = array_merge(
             ['class' => 'g-recaptcha', 'data-sitekey' => $this->siteKey],
@@ -294,7 +297,7 @@ private function prepareAttributes(array $attributes)
      * @param  array   $supported
      * @param  string  $default
      */
-    private static function checkDataAttribute(array &$attributes, $name, array $supported, $default)
+    private static function checkDataAttribute(array &$attributes, $name, array $supported, $default): void
     {
         $attribute = $attributes[$name] ?? null;
 
diff --git a/src/NoCaptchaV3.php b/src/NoCaptchaV3.php
index 1d962be..515c4b2 100644
--- a/src/NoCaptchaV3.php
+++ b/src/NoCaptchaV3.php
@@ -1,4 +1,8 @@
-<?php namespace Arcanedev\NoCaptcha;
+<?php
+
+declare(strict_types=1);
+
+namespace Arcanedev\NoCaptcha;
 
 use Arcanedev\Html\Elements\Input;
 use Arcanedev\NoCaptcha\Utilities\ResponseV3;
diff --git a/src/Utilities/AbstractResponse.php b/src/Utilities/AbstractResponse.php
index a64c71b..4549e5d 100644
--- a/src/Utilities/AbstractResponse.php
+++ b/src/Utilities/AbstractResponse.php
@@ -1,7 +1,10 @@
-<?php namespace Arcanedev\NoCaptcha\Utilities;
+<?php
 
-use Illuminate\Contracts\Support\Arrayable;
-use Illuminate\Contracts\Support\Jsonable;
+declare(strict_types=1);
+
+namespace Arcanedev\NoCaptcha\Utilities;
+
+use Illuminate\Contracts\Support\{Arrayable, Jsonable};
 use JsonSerializable;
 
 /**
diff --git a/src/Utilities/Request.php b/src/Utilities/Request.php
index c8b54a8..efcac8c 100644
--- a/src/Utilities/Request.php
+++ b/src/Utilities/Request.php
@@ -1,4 +1,8 @@
-<?php namespace Arcanedev\NoCaptcha\Utilities;
+<?php
+
+declare(strict_types=1);
+
+namespace Arcanedev\NoCaptcha\Utilities;
 
 use Arcanedev\NoCaptcha\Contracts\Utilities\Request as RequestContract;
 use Arcanedev\NoCaptcha\Exceptions\InvalidUrlException;
@@ -56,7 +60,7 @@ protected function setUrl($url)
      */
     protected function curl()
     {
-        $curl    = curl_init();
+        $curl = curl_init();
         curl_setopt_array($curl, [
             CURLOPT_URL            => $this->url,
             CURLOPT_RETURNTRANSFER => true,
@@ -99,7 +103,7 @@ public function send($url, $curled = true)
      *
      * @throws \Arcanedev\NoCaptcha\Exceptions\InvalidUrlException
      */
-    private function checkUrl(&$url)
+    private function checkUrl(&$url): void
     {
         if ( ! is_string($url))
             throw new InvalidUrlException(
@@ -120,7 +124,7 @@ private function checkUrl(&$url)
      *
      * @return bool
      */
-    private function isCurlExists()
+    private function isCurlExists(): bool
     {
         return function_exists('curl_version');
     }
@@ -132,7 +136,7 @@ private function isCurlExists()
      *
      * @return bool
      */
-    private function checkResult($result)
+    private function checkResult($result): bool
     {
         return is_string($result) && ! empty($result);
     }
diff --git a/src/Utilities/ResponseV2.php b/src/Utilities/ResponseV2.php
index 2c6442f..356745c 100644
--- a/src/Utilities/ResponseV2.php
+++ b/src/Utilities/ResponseV2.php
@@ -1,4 +1,8 @@
-<?php namespace Arcanedev\NoCaptcha\Utilities;
+<?php
+
+declare(strict_types=1);
+
+namespace Arcanedev\NoCaptcha\Utilities;
 
 /**
  * Class     ResponseV2
@@ -18,7 +22,7 @@ class ResponseV2 extends AbstractResponse
      *
      * @param  array $array
      *
-     * @return \Arcanedev\NoCaptcha\Utilities\ResponseV2
+     * @return \Arcanedev\NoCaptcha\Utilities\ResponseV2|mixed
      */
     public static function fromArray(array $array)
     {
diff --git a/src/Utilities/ResponseV3.php b/src/Utilities/ResponseV3.php
index 874c58a..f2cac63 100644
--- a/src/Utilities/ResponseV3.php
+++ b/src/Utilities/ResponseV3.php
@@ -1,4 +1,8 @@
-<?php namespace Arcanedev\NoCaptcha\Utilities;
+<?php
+
+declare(strict_types=1);
+
+namespace Arcanedev\NoCaptcha\Utilities;
 
 use Arcanedev\NoCaptcha\Contracts\Utilities\Response as ResponseContract;
 
@@ -133,7 +137,7 @@ public function getAction()
      *
      * @param  array  $array
      *
-     * @return \Arcanedev\NoCaptcha\Utilities\ResponseV3
+     * @return \Arcanedev\NoCaptcha\Utilities\ResponseV3|mixed
      */
     public static function fromArray(array $array)
     {
diff --git a/tests/Laravel/NoCaptchaManagerTest.php b/tests/Laravel/NoCaptchaManagerTest.php
index 84ecd9d..2a97569 100644
--- a/tests/Laravel/NoCaptchaManagerTest.php
+++ b/tests/Laravel/NoCaptchaManagerTest.php
@@ -1,7 +1,10 @@
-<?php namespace Arcanedev\NoCaptcha\Tests\Laravel;
+<?php
 
-use Arcanedev\NoCaptcha\NoCaptchaV2;
-use Arcanedev\NoCaptcha\NoCaptchaV3;
+declare(strict_types=1);
+
+namespace Arcanedev\NoCaptcha\Tests\Laravel;
+
+use Arcanedev\NoCaptcha\{NoCaptchaV2, NoCaptchaV3};
 use Arcanedev\NoCaptcha\Tests\LaravelTestCase;
 
 /**
@@ -45,7 +48,7 @@ protected function tearDown(): void
      */
 
     /** @test */
-    public function it_can_be_instantiated()
+    public function it_can_be_instantiated(): void
     {
         $expectations = [
             \Illuminate\Support\Manager::class,
@@ -59,7 +62,7 @@ public function it_can_be_instantiated()
     }
 
     /** @test */
-    public function it_can_get_default_driver()
+    public function it_can_get_default_driver(): void
     {
         static::assertInstanceOf(
             NoCaptchaV3::class,
@@ -68,7 +71,7 @@ public function it_can_get_default_driver()
     }
 
     /** @test */
-    public function it_can_get_default_driver_via_helper()
+    public function it_can_get_default_driver_via_helper(): void
     {
         static::assertInstanceOf(
             NoCaptchaV3::class,
@@ -77,7 +80,7 @@ public function it_can_get_default_driver_via_helper()
     }
 
     /** @test */
-    public function it_can_get_driver_by_given_version()
+    public function it_can_get_driver_by_given_version(): void
     {
         static::assertInstanceOf(
             NoCaptchaV3::class,
@@ -91,7 +94,7 @@ public function it_can_get_driver_by_given_version()
     }
 
     /** @test */
-    public function it_must_throw_exception_on_unsupported_version()
+    public function it_must_throw_exception_on_unsupported_version(): void
     {
         $this->expectException(\InvalidArgumentException::class);
         $this->expectExceptionMessage('Driver [v1] not supported.');
diff --git a/tests/Laravel/ValidatorRuleTest.php b/tests/Laravel/ValidatorRuleTest.php
index 885e659..9ae78e4 100644
--- a/tests/Laravel/ValidatorRuleTest.php
+++ b/tests/Laravel/ValidatorRuleTest.php
@@ -1,10 +1,13 @@
-<?php namespace Arcanedev\NoCaptcha\Tests\Laravel;
+<?php
+
+declare(strict_types=1);
+
+namespace Arcanedev\NoCaptcha\Tests\Laravel;
 
 use Arcanedev\NoCaptcha\NoCaptchaV3;
 use Arcanedev\NoCaptcha\Rules\CaptchaRule;
 use Arcanedev\NoCaptcha\Tests\LaravelTestCase;
 use Arcanedev\NoCaptcha\Utilities\Request;
-use Arcanedev\NoCaptcha\Utilities\ResponseV3;
 use Prophecy\Argument;
 
 /**
@@ -48,7 +51,7 @@ public function tearDown(): void
      */
 
     /** @test */
-    public function it_can_passes_captcha_rule()
+    public function it_can_passes_captcha_rule(): void
     {
         $this->mockRequest([
             'success' => true
@@ -65,7 +68,7 @@ public function it_can_passes_captcha_rule()
     }
 
     /** @test */
-    public function it_can_fails_captcha_rule()
+    public function it_can_fails_captcha_rule(): void
     {
         $this->mockRequest([
             'success'     => false,
@@ -91,7 +94,7 @@ public function it_can_fails_captcha_rule()
     }
 
     /** @test */
-    public function it_can_skip_ips()
+    public function it_can_skip_ips(): void
     {
         $this->mockRequest([
             'success'     => false,
@@ -108,7 +111,7 @@ public function it_can_skip_ips()
     }
 
     /** @test */
-    public function it_can_skip_ips_via_config_file()
+    public function it_can_skip_ips_via_config_file(): void
     {
         $this->app['config']->set('no-captcha.skip-ips', ['127.0.0.1']);
 
@@ -131,7 +134,7 @@ public function it_can_skip_ips_via_config_file()
      | -----------------------------------------------------------------
      */
 
-    private function mockRequest(array $response)
+    private function mockRequest(array $response): void
     {
         $request = tap($this->prophesize(Request::class), function ($request) use ($response) {
             $request->send(Argument::type('string'))->willReturn(
diff --git a/tests/LaravelTestCase.php b/tests/LaravelTestCase.php
index 2233d4e..6705570 100644
--- a/tests/LaravelTestCase.php
+++ b/tests/LaravelTestCase.php
@@ -1,4 +1,8 @@
-<?php namespace Arcanedev\NoCaptcha\Tests;
+<?php
+
+declare(strict_types=1);
+
+namespace Arcanedev\NoCaptcha\Tests;
 
 use Orchestra\Testbench\TestCase as BaseTestCase;
 
diff --git a/tests/NoCaptchaServiceProviderTest.php b/tests/NoCaptchaServiceProviderTest.php
index e7c913d..9e07096 100644
--- a/tests/NoCaptchaServiceProviderTest.php
+++ b/tests/NoCaptchaServiceProviderTest.php
@@ -1,4 +1,8 @@
-<?php namespace Arcanedev\NoCaptcha\Tests;
+<?php
+
+declare(strict_types=1);
+
+namespace Arcanedev\NoCaptcha\Tests;
 
 use Arcanedev\NoCaptcha\NoCaptchaServiceProvider;
 
@@ -43,7 +47,7 @@ public function tearDown(): void
      */
 
     /** @test */
-    public function it_can_be_instantiated()
+    public function it_can_be_instantiated(): void
     {
         $expectations = [
             \Illuminate\Support\ServiceProvider::class,
@@ -59,7 +63,7 @@ public function it_can_be_instantiated()
     }
 
     /** @test */
-    public function it_can_provides()
+    public function it_can_provides(): void
     {
         $expected = [
             \Arcanedev\NoCaptcha\Contracts\NoCaptcha::class,
diff --git a/tests/NoCaptchaV2Test.php b/tests/NoCaptchaV2Test.php
index 72e890f..c6b2fe4 100644
--- a/tests/NoCaptchaV2Test.php
+++ b/tests/NoCaptchaV2Test.php
@@ -1,4 +1,8 @@
-<?php namespace Arcanedev\NoCaptcha\Tests;
+<?php
+
+declare(strict_types=1);
+
+namespace Arcanedev\NoCaptcha\Tests;
 
 use Arcanedev\NoCaptcha\NoCaptchaV2;
 use Arcanedev\NoCaptcha\Utilities\Request;
@@ -13,40 +17,13 @@
  */
 class NoCaptchaV2Test extends TestCase
 {
-    /* -----------------------------------------------------------------
-     |  Properties
-     | -----------------------------------------------------------------
-     */
-
-    /** @var  \Arcanedev\NoCaptcha\NoCaptchaV2 */
-    private $noCaptcha;
-
-    /* -----------------------------------------------------------------
-     |  Main Methods
-     | -----------------------------------------------------------------
-     */
-
-    public function setUp(): void
-    {
-        parent::setUp();
-
-        $this->noCaptcha = $this->createCaptcha();
-    }
-
-    public function tearDown(): void
-    {
-        unset($this->noCaptcha);
-
-        parent::tearDown();
-    }
-
     /* -----------------------------------------------------------------
      |  Tests
      | -----------------------------------------------------------------
      */
 
     /** @test */
-    public function it_can_get_client_url()
+    public function it_can_get_client_url(): void
     {
         static::assertSame(
             'https://www.google.com/recaptcha/api.js',
@@ -69,7 +46,7 @@ public function it_can_get_client_url()
     }
 
     /** @test */
-    public function it_can_get_verification_url()
+    public function it_can_get_verification_url(): void
     {
         static::assertSame(
             'https://www.google.com/recaptcha/api/siteverify',
@@ -92,20 +69,22 @@ public function it_can_get_verification_url()
     }
 
     /** @test */
-    public function it_can_be_instantiated()
+    public function it_can_be_instantiated(): void
     {
-        static::assertInstanceOf(NoCaptchaV2::class, $this->noCaptcha);
+        $noCaptcha = $this->createCaptcha();
+
+        static::assertInstanceOf(NoCaptchaV2::class, $noCaptcha);
 
         static::assertSame(
             '<script src="'.NoCaptchaV2::getClientUrl().'" async defer></script>',
-            $this->noCaptcha->script()->toHtml()
+            $noCaptcha->script()->toHtml()
         );
     }
 
     /** @test */
-    public function it_can_be_instantiated_with_nullable_attributes()
+    public function it_can_be_instantiated_with_nullable_attributes(): void
     {
-        $this->noCaptcha = $this->createCaptcha(null);
+        $noCaptcha = $this->createCaptcha(null);
         $attributes = [
             'data-theme' => null,
             'data-type'  => null,
@@ -114,7 +93,7 @@ public function it_can_be_instantiated_with_nullable_attributes()
 
         static::assertSame(
             '<div id="captcha" name="captcha" class="g-recaptcha" data-sitekey="site-key"></div>',
-            $this->noCaptcha->display('captcha', $attributes)->toHtml()
+            $noCaptcha->display('captcha', $attributes)->toHtml()
         );
     }
 
@@ -126,17 +105,14 @@ public function it_can_be_instantiated_with_nullable_attributes()
      * @param  array   $attributes
      * @param  string  $expected
      */
-    public function it_can_display_with_custom_attributes(array $attributes, $expected)
+    public function it_can_display_with_custom_attributes(array $attributes, $expected): void
     {
         static::assertSame(
             $expected, $this->createCaptcha()->display('captcha', $attributes)->toHtml()
         );
     }
 
-    /**
-     * @return array
-     */
-    public function provideNoCaptchaAttributes()
+    public function provideNoCaptchaAttributes(): array
     {
         return [
             [
@@ -179,7 +155,7 @@ public function provideNoCaptchaAttributes()
     }
 
     /** @test */
-    public function it_must_throw_invalid_type_exception_on_secret_key()
+    public function it_must_throw_invalid_type_exception_on_secret_key(): void
     {
         $this->expectException(\Arcanedev\NoCaptcha\Exceptions\ApiException::class);
         $this->expectExceptionMessage('The secret key must be a string value, NULL given');
@@ -188,7 +164,7 @@ public function it_must_throw_invalid_type_exception_on_secret_key()
     }
 
     /** @test */
-    public function it_must_throw_api_exception_on_empty_secret_key()
+    public function it_must_throw_api_exception_on_empty_secret_key(): void
     {
         $this->expectException(\Arcanedev\NoCaptcha\Exceptions\ApiException::class);
         $this->expectExceptionMessage('The secret key must not be empty');
@@ -197,7 +173,7 @@ public function it_must_throw_api_exception_on_empty_secret_key()
     }
 
     /** @test */
-    public function it_must_throw_invalid_type_exception_on_site_key()
+    public function it_must_throw_invalid_type_exception_on_site_key(): void
     {
         $this->expectException(\Arcanedev\NoCaptcha\Exceptions\ApiException::class);
         $this->expectExceptionMessage('The site key must be a string value, NULL given');
@@ -206,7 +182,7 @@ public function it_must_throw_invalid_type_exception_on_site_key()
     }
 
     /** @test */
-    public function it_must_throw_api_exception_on_empty_site_key()
+    public function it_must_throw_api_exception_on_empty_site_key(): void
     {
         $this->expectException(\Arcanedev\NoCaptcha\Exceptions\ApiException::class);
         $this->expectExceptionMessage('The site key must not be empty');
@@ -215,45 +191,48 @@ public function it_must_throw_api_exception_on_empty_site_key()
     }
 
     /** @test */
-    public function it_can_switch_locale()
+    public function it_can_switch_locale(): void
     {
-        $locale = 'fr';
-        $this->noCaptcha->setLang($locale);
+        $noCaptcha = $this->createCaptcha()
+            ->setLang($locale = 'fr');
 
-        static::assertInstanceOf(NoCaptchaV2::class, $this->noCaptcha);
+        static::assertInstanceOf(NoCaptchaV2::class, $noCaptcha);
         static::assertSame(
             '<script src="'.NoCaptchaV2::getClientUrl().'?hl='.$locale.'" async defer></script>',
-            $this->noCaptcha->script()->toHtml()
+            $noCaptcha->script()->toHtml()
         );
     }
 
     /** @test */
-    public function it_can_render_script_tag()
+    public function it_can_render_script_tag(): void
     {
+        $noCaptcha = $this->createCaptcha();
+
         $tag = '<script src="'.NoCaptchaV2::getClientUrl().'" async defer></script>';
 
-        static::assertSame($tag, $this->noCaptcha->script()->toHtml());
+        static::assertSame($tag, $noCaptcha->script()->toHtml());
 
         // Echo out only once
-        static::assertEmpty($this->noCaptcha->script()->toHtml());
+        static::assertEmpty($noCaptcha->script()->toHtml());
     }
 
     /** @test */
-    public function it_can_render_script_tag_with_lang()
+    public function it_can_render_script_tag_with_lang(): void
     {
-        $lang = 'fr';
+        $noCaptcha = $this->createCaptcha($lang = 'fr');
         $tag  = '<script src="'.NoCaptchaV2::getClientUrl().'?hl='.$lang.'" async defer></script>';
-        $this->noCaptcha = $this->createCaptcha($lang);
 
-        static::assertSame($tag, $this->noCaptcha->script()->toHtml());
+        static::assertSame($tag, $noCaptcha->script()->toHtml());
 
         // Not even twice
-        static::assertEmpty($this->noCaptcha->script()->toHtml());
+        static::assertEmpty($noCaptcha->script()->toHtml());
     }
 
     /** @test */
-    public function it_can_render_script_with_callback()
+    public function it_can_render_script_with_callback(): void
     {
+        $noCaptcha = $this->createCaptcha();
+
         $captchas = ['captcha-1', 'captcha-2'];
         $script   =
             '<script>
@@ -261,7 +240,7 @@ public function it_can_render_script_with_callback()
                     captchas: [],
                     reset: function(name) {
                         var captcha = window.noCaptcha.get(name);
-        
+
                         if (captcha)
                             window.noCaptcha.resetById(captcha.id);
                     },
@@ -286,9 +265,9 @@ public function it_can_render_script_with_callback()
                             id: grecaptcha.render(name, {\'sitekey\' : sitekey}),
                             name: name
                         };
-                        
+
                         window.noCaptcha.captchas.push(captcha);
-                        
+
                         return captcha;
                     }
                 }
@@ -303,30 +282,32 @@ public function it_can_render_script_with_callback()
 
         static::assertSame(
             array_map('trim', preg_split('/\r\n|\r|\n/', $script)),
-            array_map('trim', preg_split('/\r\n|\r|\n/', $this->noCaptcha->scriptWithCallback($captchas)->toHtml()))
+            array_map('trim', preg_split('/\r\n|\r|\n/', $noCaptcha->scriptWithCallback($captchas)->toHtml()))
         );
 
         // Not even twice
-        static::assertEmpty($this->noCaptcha->script()->toHtml());
-        static::assertEmpty($this->noCaptcha->scriptWithCallback($captchas)->toHtml());
+        static::assertEmpty($noCaptcha->script()->toHtml());
+        static::assertEmpty($noCaptcha->scriptWithCallback($captchas)->toHtml());
     }
 
     /** @test */
-    public function it_can_display_captcha()
+    public function it_can_display_captcha(): void
     {
+        $noCaptcha = $this->createCaptcha();
+
         static::assertSame(
             '<div id="captcha" name="captcha" class="g-recaptcha" data-sitekey="site-key"></div>',
-            $this->noCaptcha->display('captcha')->toHtml()
+            $noCaptcha->display('captcha')->toHtml()
         );
 
         static::assertSame(
             '<div id="captcha_1" name="captcha" class="g-recaptcha" data-sitekey="site-key"></div>',
-            $this->noCaptcha->display('captcha', ['id' => 'captcha_1'])->toHtml()
+            $noCaptcha->display('captcha', ['id' => 'captcha_1'])->toHtml()
         );
 
         static::assertSame(
             '<div id="captcha" name="captcha" class="g-recaptcha" data-sitekey="site-key" data-type="image" data-theme="light"></div>',
-            $this->noCaptcha->display('captcha', [
+            $noCaptcha->display('captcha', [
                 'data-type'  => 'image',
                 'data-theme' => 'light',
             ])->toHtml()
@@ -334,7 +315,7 @@ public function it_can_display_captcha()
 
         static::assertSame(
             '<div id="captcha" name="captcha" class="g-recaptcha" data-sitekey="site-key" data-type="audio" data-theme="dark"></div>',
-            $this->noCaptcha->display('captcha', [
+            $noCaptcha->display('captcha', [
                 'data-type'  => 'audio',
                 'data-theme' => 'dark',
             ])->toHtml()
@@ -342,26 +323,28 @@ public function it_can_display_captcha()
     }
 
     /** @test */
-    public function it_can_display_image_captcha()
+    public function it_can_display_image_captcha(): void
     {
+        $noCaptcha = $this->createCaptcha();
+
         static::assertSame(
             '<div id="captcha" name="captcha" class="g-recaptcha" data-sitekey="site-key" data-type="image"></div>',
-            $this->noCaptcha->image('captcha')->toHtml()
+            $noCaptcha->image('captcha')->toHtml()
         );
 
         static::assertSame(
             '<div id="captcha" name="captcha" class="g-recaptcha" data-sitekey="site-key" data-theme="dark" data-type="image"></div>',
-            $this->noCaptcha->image('captcha', ['data-theme' => 'dark'])->toHtml()
+            $noCaptcha->image('captcha', ['data-theme' => 'dark'])->toHtml()
         );
 
         static::assertSame(
             '<div id="captcha" name="captcha" class="g-recaptcha" data-sitekey="site-key" data-theme="light" data-type="image"></div>',
-            $this->noCaptcha->image('captcha', ['data-theme' => 'light'])->toHtml()
+            $noCaptcha->image('captcha', ['data-theme' => 'light'])->toHtml()
         );
 
         static::assertSame(
             '<div id="captcha" name="captcha" class="g-recaptcha" data-sitekey="site-key" data-theme="light" data-type="image"></div>',
-            $this->noCaptcha->image('captcha', [
+            $noCaptcha->image('captcha', [
                 'data-theme' => 'light',
                 'data-type'  => 'audio', // Intruder
             ])->toHtml()
@@ -369,26 +352,28 @@ public function it_can_display_image_captcha()
     }
 
     /** @test */
-    public function it_can_display_audio_captcha()
+    public function it_can_display_audio_captcha(): void
     {
+        $noCaptcha = $this->createCaptcha();
+
         static::assertSame(
             '<div id="captcha" name="captcha" class="g-recaptcha" data-sitekey="site-key" data-type="audio"></div>',
-            $this->noCaptcha->audio('captcha')->toHtml()
+            $noCaptcha->audio('captcha')->toHtml()
         );
 
         static::assertSame(
             '<div id="captcha" name="captcha" class="g-recaptcha" data-sitekey="site-key" data-theme="dark" data-type="audio"></div>',
-            $this->noCaptcha->audio('captcha', ['data-theme' => 'dark'])->toHtml()
+            $noCaptcha->audio('captcha', ['data-theme' => 'dark'])->toHtml()
         );
 
         static::assertSame(
             '<div id="captcha" name="captcha" class="g-recaptcha" data-sitekey="site-key" data-theme="light" data-type="audio"></div>',
-            $this->noCaptcha->audio('captcha', ['data-theme' => 'light'])->toHtml()
+            $noCaptcha->audio('captcha', ['data-theme' => 'light'])->toHtml()
         );
 
         static::assertSame(
             '<div id="captcha" name="captcha" class="g-recaptcha" data-sitekey="site-key" data-theme="light" data-type="audio"></div>',
-            $this->noCaptcha->audio('captcha', [
+            $noCaptcha->audio('captcha', [
                 'data-theme' => 'light',
                 'data-type'  => 'image', // Intruder
             ])->toHtml()
@@ -396,78 +381,86 @@ public function it_can_display_audio_captcha()
     }
 
     /** @test */
-    public function it_can_display_captcha_with_defaults()
+    public function it_can_display_captcha_with_defaults(): void
     {
+        $noCaptcha = $this->createCaptcha();
+
         static::assertSame(
             '<div id="captcha" name="captcha" class="g-recaptcha" data-sitekey="site-key" data-type="image"></div>',
-            $this->noCaptcha->display('captcha', ['data-type'  => 'video'])->toHtml()
+            $noCaptcha->display('captcha', ['data-type'  => 'video'])->toHtml()
         );
 
         static::assertSame(
             '<div id="captcha" name="captcha" class="g-recaptcha" data-sitekey="site-key" data-type="image"></div>',
-            $this->noCaptcha->display('captcha', ['data-type'  => true])->toHtml()
+            $noCaptcha->display('captcha', ['data-type'  => true])->toHtml()
         );
 
         static::assertSame(
             '<div id="captcha" name="captcha" class="g-recaptcha" data-sitekey="site-key" data-theme="light"></div>',
-            $this->noCaptcha->display('captcha', ['data-theme' => 'blue'])->toHtml()
+            $noCaptcha->display('captcha', ['data-theme' => 'blue'])->toHtml()
         );
 
         static::assertSame(
             '<div id="captcha" name="captcha" class="g-recaptcha" data-sitekey="site-key" data-theme="light"></div>',
-            $this->noCaptcha->display('captcha', ['data-theme' => true])->toHtml()
+            $noCaptcha->display('captcha', ['data-theme' => true])->toHtml()
         );
     }
 
     /** @test */
-    public function it_can_display_captcha_with_style_attribute()
+    public function it_can_display_captcha_with_style_attribute(): void
     {
+        $noCaptcha = $this->createCaptcha();
+
         static::assertSame(
             '<div id="captcha" name="captcha" class="g-recaptcha" data-sitekey="site-key" style="transform: scale(0.77); transform-origin: 0 0;"></div>',
-            $this->noCaptcha->display('captcha', [
+            $noCaptcha->display('captcha', [
                 'style' => 'transform: scale(0.77); transform-origin: 0 0;'
             ])->toHtml()
         );
     }
 
     /** @test */
-    public function it_can_display_invisible_captcha()
+    public function it_can_display_invisible_captcha(): void
     {
+        $noCaptcha = $this->createCaptcha();
+
         static::assertSame(
             '<button data-callback="onSubmit" class="g-recaptcha" data-sitekey="site-key">Send</button>',
-            $this->noCaptcha->button('Send')->toHtml()
+            $noCaptcha->button('Send')->toHtml()
         );
 
         static::assertSame(
             '<button data-callback="submitForm" class="g-recaptcha" data-sitekey="site-key">Post the form</button>',
-            $this->noCaptcha->button('Post the form', ['data-callback' => 'submitForm'])->toHtml()
+            $noCaptcha->button('Post the form', ['data-callback' => 'submitForm'])->toHtml()
         );
 
         static::assertSame(
             '<button data-callback="onSubmit" class="g-recaptcha" data-sitekey="site-key" data-size="invisible">Send</button>',
-            $this->noCaptcha->button('Send', ['data-size' => 'invisible'])->toHtml()
+            $noCaptcha->button('Send', ['data-size' => 'invisible'])->toHtml()
         );
 
         static::assertSame(
             '<button data-callback="onSubmit" class="g-recaptcha" data-sitekey="site-key" data-badge="bottomright">Send</button>',
-            $this->noCaptcha->button('Send', ['data-badge' => 'bottomright'])->toHtml()
+            $noCaptcha->button('Send', ['data-badge' => 'bottomright'])->toHtml()
         );
 
         static::assertSame(
             '<button data-callback="onSubmit" class="g-recaptcha" data-sitekey="site-key" data-badge="bottomright">Send</button>',
-            $this->noCaptcha->button('Send', ['data-badge' => 'topright'])->toHtml()
+            $noCaptcha->button('Send', ['data-badge' => 'topright'])->toHtml()
         );
     }
 
     /** @test */
-    public function it_can_verify()
+    public function it_can_verify(): void
     {
+        $noCaptcha = $this->createCaptcha();
+
         /** @var \Arcanedev\NoCaptcha\Utilities\Request  $requestClient */
         $requestClient = $this->prophesize(Request::class);
         $requestClient->send(Argument::type('string'))
             ->willReturn('{"success": true}');
 
-        $response = $this->noCaptcha
+        $response = $noCaptcha
             ->setRequestClient($requestClient->reveal())
             ->verify('re-captcha-response');
 
@@ -475,8 +468,10 @@ public function it_can_verify()
     }
 
     /** @test */
-    public function it_can_verify_psr7_request()
+    public function it_can_verify_psr7_request(): void
     {
+        $noCaptcha = $this->createCaptcha();
+
         /**
          * @var  \Psr\Http\Message\ServerRequestInterface  $request
          * @var  \Arcanedev\NoCaptcha\Utilities\Request    $requestClient
@@ -489,7 +484,7 @@ public function it_can_verify_psr7_request()
         $request->getParsedBody()->willReturn(['g-recaptcha-response' => true]);
         $request->getServerParams()->willReturn(['REMOTE_ADDR' => '127.0.0.1']);
 
-        $response = $this->noCaptcha
+        $response = $noCaptcha
             ->setRequestClient($requestClient->reveal())
             ->verifyRequest($request->reveal());
 
@@ -497,9 +492,10 @@ public function it_can_verify_psr7_request()
     }
 
     /** @test */
-    public function it_can_verify_with_fails()
+    public function it_can_verify_with_fails(): void
     {
-        $response = $this->noCaptcha->verify('');
+        $noCaptcha = $this->createCaptcha();
+        $response  = $noCaptcha->verify('');
 
         static::assertFalse($response->isSuccess());
 
@@ -511,7 +507,7 @@ public function it_can_verify_with_fails()
                 ]));
         })->reveal();
 
-        $response = $this->noCaptcha
+        $response = $noCaptcha
             ->setRequestClient($client)
             ->verify('re-captcha-response');
 
@@ -519,47 +515,49 @@ public function it_can_verify_with_fails()
     }
 
     /** @test */
-    public function it_can_render_captcha_with_optional_name()
+    public function it_can_render_captcha_with_optional_name(): void
     {
+        $noCaptcha = $this->createCaptcha();
+
         static::assertSame(
             '<div class="g-recaptcha" data-sitekey="site-key"></div>',
-            $this->noCaptcha->display()->toHtml()
+            $noCaptcha->display()->toHtml()
         );
         static::assertSame(
             '<div class="g-recaptcha" data-sitekey="site-key" data-type="image"></div>',
-            $this->noCaptcha->image()->toHtml()
+            $noCaptcha->image()->toHtml()
         );
         static::assertSame(
             '<div class="g-recaptcha" data-sitekey="site-key" data-type="audio"></div>',
-            $this->noCaptcha->audio()->toHtml()
+            $noCaptcha->audio()->toHtml()
         );
     }
 
     /** @test */
-    public function it_must_throw_an_invalid_argument_exception_when_the_generic_captcha_name_is_same_as_captcha_response_name()
+    public function it_must_throw_an_invalid_argument_exception_when_the_generic_captcha_name_is_same_as_captcha_response_name(): void
     {
         $this->expectException(\Arcanedev\NoCaptcha\Exceptions\InvalidArgumentException::class);
         $this->expectExceptionMessage('The captcha name must be different from "g-recaptcha-response".');
 
-        $this->noCaptcha->display(NoCaptchaV2::CAPTCHA_NAME);
+        $this->createCaptcha()->display(NoCaptchaV2::CAPTCHA_NAME);
     }
 
     /** @test */
-    public function it_must_throw_an_invalid_argument_exception_when_the_image_captcha_name_is_same_as_captcha_response_name()
+    public function it_must_throw_an_invalid_argument_exception_when_the_image_captcha_name_is_same_as_captcha_response_name(): void
     {
         $this->expectException(\Arcanedev\NoCaptcha\Exceptions\InvalidArgumentException::class);
         $this->expectExceptionMessage('The captcha name must be different from "g-recaptcha-response".');
 
-        $this->noCaptcha->image(NoCaptchaV2::CAPTCHA_NAME);
+        $this->createCaptcha()->image(NoCaptchaV2::CAPTCHA_NAME);
     }
 
     /** @test */
-    public function it_must_throw_an_invalid_argument_exception_when_the_audio_captcha_name_is_same_as_captcha_response_name()
+    public function it_must_throw_an_invalid_argument_exception_when_the_audio_captcha_name_is_same_as_captcha_response_name(): void
     {
         $this->expectException(\Arcanedev\NoCaptcha\Exceptions\InvalidArgumentException::class);
         $this->expectExceptionMessage('The captcha name must be different from "g-recaptcha-response".');
 
-        $this->noCaptcha->audio(NoCaptchaV2::CAPTCHA_NAME);
+        $this->createCaptcha()->audio(NoCaptchaV2::CAPTCHA_NAME);
     }
 
     /* -----------------------------------------------------------------
diff --git a/tests/NoCaptchaV3Test.php b/tests/NoCaptchaV3Test.php
index 25075f6..3dde75d 100644
--- a/tests/NoCaptchaV3Test.php
+++ b/tests/NoCaptchaV3Test.php
@@ -1,4 +1,8 @@
-<?php namespace Arcanedev\NoCaptcha\Tests;
+<?php
+
+declare(strict_types=1);
+
+namespace Arcanedev\NoCaptcha\Tests;
 
 use Arcanedev\NoCaptcha\NoCaptchaV3;
 use Arcanedev\NoCaptcha\Utilities\Request;
@@ -13,40 +17,13 @@
  */
 class NoCaptchaV3Test extends TestCase
 {
-    /* -----------------------------------------------------------------
-     |  Properties
-     | -----------------------------------------------------------------
-     */
-
-    /** @var  \Arcanedev\NoCaptcha\NoCaptchaV3 */
-    private $noCaptcha;
-
-    /* -----------------------------------------------------------------
-     |  Main Methods
-     | -----------------------------------------------------------------
-     */
-
-    public function setUp(): void
-    {
-        parent::setUp();
-
-        $this->noCaptcha = $this->createCaptcha();
-    }
-
-    public function tearDown(): void
-    {
-        unset($this->noCaptcha);
-
-        parent::tearDown();
-    }
-
     /* -----------------------------------------------------------------
      |  Tests
      | -----------------------------------------------------------------
      */
 
     /** @test */
-    public function it_can_get_client_url()
+    public function it_can_get_client_url(): void
     {
         static::assertSame(
             'https://www.google.com/recaptcha/api.js',
@@ -69,7 +46,7 @@ public function it_can_get_client_url()
     }
 
     /** @test */
-    public function it_can_get_verification_url()
+    public function it_can_get_verification_url(): void
     {
         static::assertSame(
             'https://www.google.com/recaptcha/api/siteverify',
@@ -92,26 +69,30 @@ public function it_can_get_verification_url()
     }
 
     /** @test */
-    public function it_can_be_instantiated()
+    public function it_can_be_instantiated(): void
     {
-        static::assertInstanceOf(NoCaptchaV3::class, $this->noCaptcha);
+        $noCaptcha = $this->createCaptcha();
+
+        static::assertInstanceOf(NoCaptchaV3::class, $noCaptcha);
         static::assertSame(
             '<script src="https://www.google.com/recaptcha/api.js?render=site-key"></script>',
-            $this->noCaptcha->script()->toHtml()
+            $noCaptcha->script()->toHtml()
         );
     }
 
     /** @test */
-    public function it_can_be_instantiated_with_defaults()
+    public function it_can_be_instantiated_with_defaults(): void
     {
+        $noCaptcha = $this->createCaptcha();
+
         static::assertSame(
             '<input type="hidden" id="g-recaptcha-response" name="g-recaptcha-response">',
-            $this->noCaptcha->input()->toHtml()
+            $noCaptcha->input()->toHtml()
         );
     }
 
     /** @test */
-    public function it_must_throw_invalid_type_exception_on_secret_key()
+    public function it_must_throw_invalid_type_exception_on_secret_key(): void
     {
         $this->expectException(\Arcanedev\NoCaptcha\Exceptions\ApiException::class);
         $this->expectExceptionMessage('The secret key must be a string value, NULL given');
@@ -120,7 +101,7 @@ public function it_must_throw_invalid_type_exception_on_secret_key()
     }
 
     /** @test */
-    public function it_must_throw_api_exception_on_empty_secret_key()
+    public function it_must_throw_api_exception_on_empty_secret_key(): void
     {
         $this->expectException(\Arcanedev\NoCaptcha\Exceptions\ApiException::class);
         $this->expectExceptionMessage('The secret key must not be empty');
@@ -129,7 +110,7 @@ public function it_must_throw_api_exception_on_empty_secret_key()
     }
 
     /** @test */
-    public function it_must_throw_invalid_type_exception_on_site_key()
+    public function it_must_throw_invalid_type_exception_on_site_key(): void
     {
         $this->expectException(\Arcanedev\NoCaptcha\Exceptions\ApiException::class);
         $this->expectExceptionMessage('The site key must be a string value, NULL given');
@@ -138,7 +119,7 @@ public function it_must_throw_invalid_type_exception_on_site_key()
     }
 
     /** @test */
-    public function it_must_throw_api_exception_on_empty_site_key()
+    public function it_must_throw_api_exception_on_empty_site_key(): void
     {
         $this->expectException(\Arcanedev\NoCaptcha\Exceptions\ApiException::class);
         $this->expectExceptionMessage('The site key must not be empty');
@@ -147,58 +128,64 @@ public function it_must_throw_api_exception_on_empty_site_key()
     }
 
     /** @test */
-    public function it_can_switch_locale()
+    public function it_can_switch_locale(): void
     {
-        $this->noCaptcha->setLang('fr');
+        $noCaptcha = $this->createCaptcha()->setLang('fr');
 
-        static::assertInstanceOf(NoCaptchaV3::class, $this->noCaptcha);
+        static::assertInstanceOf(NoCaptchaV3::class, $noCaptcha);
         static::assertSame(
             '<script src="https://www.google.com/recaptcha/api.js?hl=fr&render=site-key"></script>',
-            $this->noCaptcha->script()->toHtml()
+            $noCaptcha->script()->toHtml()
         );
     }
 
     /** @test */
-    public function it_can_render_script_tag()
+    public function it_can_render_script_tag(): void
     {
+        $noCaptcha = $this->createCaptcha();
+
         static::assertSame(
             '<script src="https://www.google.com/recaptcha/api.js?render=site-key"></script>',
-            $this->noCaptcha->script()->toHtml()
+            $noCaptcha->script()->toHtml()
         );
 
         // Echo out only once
-        static::assertEmpty($this->noCaptcha->script()->toHtml());
+        static::assertEmpty($noCaptcha->script()->toHtml());
     }
 
     /** @test */
-    public function it_can_render_script_tag_with_lang()
+    public function it_can_render_script_tag_with_lang(): void
     {
-        $this->noCaptcha->setLang('fr');
+        $noCaptcha = $this->createCaptcha()->setLang('fr');
 
         static::assertSame(
             '<script src="https://www.google.com/recaptcha/api.js?hl=fr&render=site-key"></script>',
-            $this->noCaptcha->script()->toHtml()
+            $noCaptcha->script()->toHtml()
         );
 
         // Not twice
-        static::assertEmpty($this->noCaptcha->script()->toHtml());
+        static::assertEmpty($noCaptcha->script()->toHtml());
     }
 
     /** @test */
-    public function it_can_render_script_tag_with_onload_callback()
+    public function it_can_render_script_tag_with_onload_callback(): void
     {
+        $noCaptcha = $this->createCaptcha();
+
         static::assertSame(
             '<script src="https://www.google.com/recaptcha/api.js?render=site-key&onload=no_captcha_onload"></script>',
-            $this->noCaptcha->script('no_captcha_onload')->toHtml()
+            $noCaptcha->script('no_captcha_onload')->toHtml()
         );
 
         // Not twice
-        static::assertEmpty($this->noCaptcha->script()->toHtml());
+        static::assertEmpty($noCaptcha->script()->toHtml());
     }
 
     /** @test */
-    public function it_can_render_api_script()
+    public function it_can_render_api_script(): void
     {
+        $noCaptcha = $this->createCaptcha();
+
         static::assertSame(
             "<script>
                 window.noCaptcha = {
@@ -208,21 +195,23 @@ public function it_can_render_api_script()
                     }
                 }
             </script>",
-            $this->noCaptcha->getApiScript()->toHtml()
+            $noCaptcha->getApiScript()->toHtml()
         );
     }
 
     /** @test */
-    public function it_can_verify()
+    public function it_can_verify(): void
     {
-        static::assertNull($this->noCaptcha->getLastResponse());
+        $noCaptcha = $this->createCaptcha();
+
+        static::assertNull($noCaptcha->getLastResponse());
 
         /** @var  \Arcanedev\NoCaptcha\Utilities\Request  $request */
         $request = tap($this->prophesize(Request::class), function ($request) {
             $request->send(Argument::type('string'))->willReturn('{"success": true}');
         })->reveal();
 
-        $response = $this->noCaptcha
+        $response = $noCaptcha
             ->setRequestClient($request)
             ->verify('re-captcha-response');
 
@@ -230,12 +219,12 @@ public function it_can_verify()
 
         static::assertSame(
             $response,
-            $this->noCaptcha->getLastResponse()
+            $noCaptcha->getLastResponse()
         );
     }
 
     /** @test */
-    public function it_can_verify_psr7_request()
+    public function it_can_verify_psr7_request(): void
     {
         /** @var  \Arcanedev\NoCaptcha\Utilities\Request  $client */
         $client = tap($this->prophesize(Request::class), function ($client) {
@@ -254,7 +243,7 @@ public function it_can_verify_psr7_request()
             ]);
         })->reveal();
 
-        $response = $this->noCaptcha
+        $response = $this->createCaptcha()
             ->setRequestClient($client)
             ->verifyRequest($request);
 
@@ -262,9 +251,11 @@ public function it_can_verify_psr7_request()
     }
 
     /** @test */
-    public function it_can_verify_with_fails()
+    public function it_can_verify_with_fails(): void
     {
-        $response = $this->noCaptcha->verify('');
+        $noCaptcha = $this->createCaptcha();
+
+        $response = $noCaptcha->verify('');
 
         static::assertFalse($response->isSuccess());
 
@@ -277,7 +268,7 @@ public function it_can_verify_with_fails()
             );
         })->reveal();
 
-        $response = $this->noCaptcha
+        $response = $noCaptcha
             ->setRequestClient($request)
             ->verify('re-captcha-response');
 
@@ -285,11 +276,13 @@ public function it_can_verify_with_fails()
     }
 
     /** @test */
-    public function it_can_render_captcha_with_optional_name()
+    public function it_can_render_captcha_with_optional_name(): void
     {
+        $noCaptcha = $this->createCaptcha();
+
         static::assertSame(
             '<input type="hidden" id="g-recaptcha" name="g-recaptcha">',
-            $this->noCaptcha->input('g-recaptcha')->toHtml()
+            $noCaptcha->input('g-recaptcha')->toHtml()
         );
     }
 
diff --git a/tests/TestCase.php b/tests/TestCase.php
index 6fed637..3805b36 100644
--- a/tests/TestCase.php
+++ b/tests/TestCase.php
@@ -1,4 +1,8 @@
-<?php namespace Arcanedev\NoCaptcha\Tests;
+<?php
+
+declare(strict_types=1);
+
+namespace Arcanedev\NoCaptcha\Tests;
 
 use PHPUnit\Framework\TestCase as BaseTestCase;
 
diff --git a/tests/Utilities/RequestTest.php b/tests/Utilities/RequestTest.php
index c0c2252..d24244c 100644
--- a/tests/Utilities/RequestTest.php
+++ b/tests/Utilities/RequestTest.php
@@ -1,4 +1,8 @@
-<?php namespace Arcanedev\NoCaptcha\Tests\Utilities;
+<?php
+
+declare(strict_types=1);
+
+namespace Arcanedev\NoCaptcha\Tests\Utilities;
 
 use Arcanedev\NoCaptcha\Tests\TestCase;
 use Arcanedev\NoCaptcha\Utilities\Request;
@@ -51,13 +55,20 @@ public function tearDown(): void
      */
 
     /** @test */
-    public function it_can_be_instantiated()
+    public function it_can_be_instantiated(): void
     {
-        static::assertInstanceOf(Request::class, $this->request);
+        $expectations = [
+            \Arcanedev\NoCaptcha\Contracts\Utilities\Request::class,
+            \Arcanedev\NoCaptcha\Utilities\Request::class,
+        ];
+
+        foreach ($expectations as $expected) {
+            static::assertInstanceOf($expected, $this->request);
+        }
     }
 
     /** @test */
-    public function it_must_throw_invalid_type_exception_on_url()
+    public function it_must_throw_invalid_type_exception_on_url(): void
     {
         $this->expectException(\Arcanedev\NoCaptcha\Exceptions\InvalidUrlException::class);
         $this->expectExceptionMessage('The url must be a string value, NULL given');
@@ -66,7 +77,7 @@ public function it_must_throw_invalid_type_exception_on_url()
     }
 
     /** @test */
-    public function it_must_throw_api_exception_on_url()
+    public function it_must_throw_api_exception_on_url(): void
     {
         $this->expectException(\Arcanedev\NoCaptcha\Exceptions\InvalidUrlException::class);
         $this->expectExceptionMessage('The url must not be empty');
@@ -75,7 +86,7 @@ public function it_must_throw_api_exception_on_url()
     }
 
     /** @test */
-    public function it_must_throw_invalid_url_exception_on_url()
+    public function it_must_throw_invalid_url_exception_on_url(): void
     {
         $this->expectException(\Arcanedev\NoCaptcha\Exceptions\InvalidUrlException::class);
         $this->expectExceptionMessage('The url [trust-me-im-a-valid-url] is invalid');
diff --git a/tests/Utilities/ResponseV2Test.php b/tests/Utilities/ResponseV2Test.php
index a432ad2..0dcd930 100644
--- a/tests/Utilities/ResponseV2Test.php
+++ b/tests/Utilities/ResponseV2Test.php
@@ -1,4 +1,8 @@
-<?php namespace Arcanedev\NoCaptcha\Tests\Utilities;
+<?php
+
+declare(strict_types=1);
+
+namespace Arcanedev\NoCaptcha\Tests\Utilities;
 
 use Arcanedev\NoCaptcha\Tests\TestCase;
 use Arcanedev\NoCaptcha\Utilities\ResponseV2;
@@ -17,7 +21,7 @@ class ResponseV2Test extends TestCase
      */
 
     /** @test */
-    public function it_can_be_instantiated()
+    public function it_can_be_instantiated(): void
     {
         $response = new ResponseV2(true);
 
@@ -25,7 +29,7 @@ public function it_can_be_instantiated()
     }
 
     /** @test */
-    public function it_can_be_instantiated_from_json()
+    public function it_can_be_instantiated_from_json(): void
     {
         $response = ResponseV2::fromJson('{"success": true}');
 
@@ -33,7 +37,7 @@ public function it_can_be_instantiated_from_json()
     }
 
     /** @test */
-    public function it_can_convert_to_json()
+    public function it_can_convert_to_json(): void
     {
         $response = ResponseV2::fromArray(['success' => true]);
 
@@ -47,7 +51,7 @@ public function it_can_convert_to_json()
     }
 
     /** @test */
-    public function it_can_be_instantiated_from_array()
+    public function it_can_be_instantiated_from_array(): void
     {
         $response = ResponseV2::fromArray(['success' => true]);
 
@@ -55,7 +59,7 @@ public function it_can_be_instantiated_from_array()
     }
 
     /** @test */
-    public function it_can_get_response_data()
+    public function it_can_get_response_data(): void
     {
         $response = new ResponseV2(
             false,
@@ -83,7 +87,7 @@ public function it_can_get_response_data()
     }
 
     /** @test */
-    public function it_can_convert_to_array()
+    public function it_can_convert_to_array(): void
     {
         $response = new ResponseV2(
             false,
@@ -104,7 +108,7 @@ public function it_can_convert_to_array()
     }
 
     /** @test */
-    public function it_can_check_the_hostname()
+    public function it_can_check_the_hostname(): void
     {
         $response = ResponseV2::fromArray([
             'success'  => true,
diff --git a/tests/Utilities/ResponseV3Test.php b/tests/Utilities/ResponseV3Test.php
index f35974b..6249cf3 100644
--- a/tests/Utilities/ResponseV3Test.php
+++ b/tests/Utilities/ResponseV3Test.php
@@ -1,4 +1,8 @@
-<?php namespace Arcanedev\NoCaptcha\Tests\Utilities;
+<?php
+
+declare(strict_types=1);
+
+namespace Arcanedev\NoCaptcha\Tests\Utilities;
 
 use Arcanedev\NoCaptcha\Tests\TestCase;
 use Arcanedev\NoCaptcha\Utilities\ResponseV3;
@@ -17,7 +21,7 @@ class ResponseV3Test extends TestCase
      */
 
     /** @test */
-    public function it_can_be_instantiated()
+    public function it_can_be_instantiated(): void
     {
         $response = new ResponseV3(true);
 
@@ -25,7 +29,7 @@ public function it_can_be_instantiated()
     }
 
     /** @test */
-    public function it_can_be_instantiated_from_json()
+    public function it_can_be_instantiated_from_json(): void
     {
         $response = ResponseV3::fromJson('{"success": true}');
 
@@ -33,7 +37,7 @@ public function it_can_be_instantiated_from_json()
     }
 
     /** @test */
-    public function it_can_be_instantiated_with_invalid_json()
+    public function it_can_be_instantiated_with_invalid_json(): void
     {
         $response = ResponseV3::fromJson('');
 
@@ -42,7 +46,7 @@ public function it_can_be_instantiated_with_invalid_json()
     }
 
     /** @test */
-    public function it_can_convert_to_json()
+    public function it_can_convert_to_json(): void
     {
         $response = ResponseV3::fromArray(['success' => true]);
 
@@ -56,7 +60,7 @@ public function it_can_convert_to_json()
     }
 
     /** @test */
-    public function it_can_be_instantiated_from_array()
+    public function it_can_be_instantiated_from_array(): void
     {
         $response = ResponseV3::fromArray(['success' => true]);
 
@@ -64,7 +68,7 @@ public function it_can_be_instantiated_from_array()
     }
 
     /** @test */
-    public function it_can_get_response_data()
+    public function it_can_get_response_data(): void
     {
         $response = new ResponseV3(
             false,
@@ -96,7 +100,7 @@ public function it_can_get_response_data()
     }
 
     /** @test */
-    public function it_can_convert_to_array()
+    public function it_can_convert_to_array(): void
     {
         $response = new ResponseV3(
             false,
@@ -121,7 +125,7 @@ public function it_can_convert_to_array()
     }
 
     /** @test */
-    public function it_can_check_the_score()
+    public function it_can_check_the_score(): void
     {
         $response = ResponseV3::fromArray([
             'success' => true,
@@ -146,7 +150,7 @@ public function it_can_check_the_score()
     }
 
     /** @test */
-    public function it_can_check_the_hostname()
+    public function it_can_check_the_hostname(): void
     {
         $response = ResponseV3::fromArray([
             'success'  => true,
@@ -164,7 +168,7 @@ public function it_can_check_the_hostname()
     }
 
     /** @test */
-    public function it_can_check_the_action_name()
+    public function it_can_check_the_action_name(): void
     {
         $response = ResponseV3::fromArray([
             'success' => true,