diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index b4fc29ef..2bab7b32 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -8,7 +8,7 @@ jobs:
 
     strategy:
       matrix:
-        php: [7.3, 7.4, 8.0]
+        php: [7.4, 8.0, 8.1]
         symfony: [4.4, 5.3]
 
     steps:
@@ -59,7 +59,10 @@ jobs:
           composer require symfony/css-selector=${{ matrix.symfony }} --ignore-platform-req=php --no-update
           composer require symfony/dom-crawler=${{ matrix.symfony }} --ignore-platform-req=php --no-update
           composer require symfony/browser-kit=${{ matrix.symfony }} --ignore-platform-req=php --no-update
-          composer install --prefer-dist --no-progress --ignore-platform-req=php
+          composer require vlucas/phpdotenv --ignore-platform-req=php --no-update
+          composer require codeception/module-asserts --ignore-platform-req=php --no-update
+          composer require codeception/module-doctrine2 --ignore-platform-req=php --no-update
+          composer install --prefer-dist --no-progress --ignore-platform-req=php --no-dev
 
       - name: Validate composer.json and composer.lock
         run: composer validate
diff --git a/composer.json b/composer.json
index 168f4e76..82aeb1d5 100644
--- a/composer.json
+++ b/composer.json
@@ -16,7 +16,7 @@
     ],
     "minimum-stability": "RC",
     "require": {
-        "php": "^7.3 | ^8.0",
+        "php": "^7.4 | ^8.0",
         "ext-json": "*",
         "codeception/lib-innerbrowser": "^1.4",
         "codeception/codeception": "^4.0"
@@ -24,6 +24,14 @@
     "require-dev": {
         "codeception/module-asserts": "^1.3",
         "codeception/module-doctrine2": "^1.1",
+        "doctrine/orm": "^2.10",
+        "symfony/form": "^4.4 | ^5.0",
+        "symfony/framework-bundle": "^4.4 | ^5.0",
+        "symfony/http-kernel": "^4.4 | ^5.0",
+        "symfony/mailer": "^4.4 | ^5.0",
+        "symfony/routing": "^4.4 | ^5.0",
+        "symfony/security-bundle": "^4.4 | ^5.0",
+        "symfony/twig-bundle": "^4.4 | ^5.0",
         "vlucas/phpdotenv": "^4.2 | ^5.3"
     },
     "suggest": {
diff --git a/src/Codeception/Lib/Connector/Symfony.php b/src/Codeception/Lib/Connector/Symfony.php
index 174b1607..c71f1e60 100644
--- a/src/Codeception/Lib/Connector/Symfony.php
+++ b/src/Codeception/Lib/Connector/Symfony.php
@@ -17,25 +17,13 @@
 
 class Symfony extends HttpKernelBrowser
 {
-    /**
-     * @var bool
-     */
-    private $rebootable;
+    private bool $rebootable;
 
-    /**
-     * @var bool
-     */
-    private $hasPerformedRequest = false;
+    private bool $hasPerformedRequest = false;
 
-    /**
-     * @var ContainerInterface
-     */
-    private $container;
+    private ?ContainerInterface $container;
 
-    /**
-     * @var array
-     */
-    public $persistentServices = [];
+    public array $persistentServices = [];
 
     /**
      * Constructor.
@@ -67,6 +55,7 @@ protected function doRequest($request): Response
                 $this->hasPerformedRequest = true;
             }
         }
+
         return parent::doRequest($request);
     }
 
@@ -113,6 +102,7 @@ private function getContainer(): ?ContainerInterface
         if ($container->has('test.service_container')) {
             $container = $container->get('test.service_container');
         }
+
         return $container;
     }
 
@@ -123,6 +113,7 @@ private function getProfiler(): ?Profiler
             $profiler = $this->container->get('profiler');
             return $profiler;
         }
+
         return null;
     }
 
@@ -131,10 +122,11 @@ private function getService(string $serviceName): ?object
         if ($this->container->has($serviceName)) {
             return $this->container->get($serviceName);
         }
+
         return null;
     }
 
-    private function persistDoctrineConnections()
+    private function persistDoctrineConnections(): void
     {
         if (!$this->container->hasParameter('doctrine.connections')) {
             return;
diff --git a/src/Codeception/Module/Symfony.php b/src/Codeception/Module/Symfony.php
index 745cf16a..78ecd898 100644
--- a/src/Codeception/Module/Symfony.php
+++ b/src/Codeception/Module/Symfony.php
@@ -143,16 +143,16 @@ class Symfony extends Framework implements DoctrineProvider, PartedModule
     use TimeAssertionsTrait;
     use TwigAssertionsTrait;
 
-    /**
-     * @var Kernel
-     */
-    public $kernel;
+    public Kernel $kernel;
 
     /**
      * @var SymfonyConnector
      */
     public $client;
 
+    /**
+     * @var array
+     */
     public $config = [
         'app_path' => 'app',
         'kernel_class' => 'App\Kernel',
@@ -172,10 +172,7 @@ public function _parts(): array
         return ['services'];
     }
 
-    /**
-     * @var string|null
-     */
-    protected $kernelClass;
+    protected ?string $kernelClass = null;
 
     /**
      * Services that should be persistent permanently for all tests
@@ -229,6 +226,7 @@ public function _after(TestInterface $test): void
         foreach (array_keys($this->permanentServices) as $serviceName) {
             $this->permanentServices[$serviceName] = $this->grabService($serviceName);
         }
+
         parent::_after($test);
     }
 
@@ -250,6 +248,7 @@ public function _getEntityManager()
         if ($this->kernel === null) {
             $this->fail('Symfony module is not loaded');
         }
+
         $emService = $this->config['em_service'];
         if (!isset($this->permanentServices[$emService])) {
             // Try to persist configured entity manager
@@ -258,13 +257,16 @@ public function _getEntityManager()
             if ($container->has('doctrine')) {
                 $this->persistPermanentService('doctrine');
             }
+
             if ($container->has('doctrine.orm.default_entity_manager')) {
                 $this->persistPermanentService('doctrine.orm.default_entity_manager');
             }
+
             if ($container->has('doctrine.dbal.default_connection')) {
                 $this->persistPermanentService('doctrine.dbal.default_connection');
             }
         }
+
         return $this->permanentServices[$emService];
     }
 
@@ -277,9 +279,11 @@ public function _getContainer(): ContainerInterface
         if (!$container instanceof ContainerInterface) {
             $this->fail('Could not get Symfony container');
         }
+
         if ($container->has('test.service_container')) {
             $container = $container->get('test.service_container');
         }
+
         return $container;
     }
 
@@ -348,6 +352,7 @@ protected function getProfile(): ?Profile
         if (!$profiler = $this->getService('profiler')) {
             return null;
         }
+
         try {
             $response = $this->getClient()->getResponse();
             return $profiler->loadProfileFromResponse($response);
@@ -356,6 +361,7 @@ protected function getProfile(): ?Profile
         } catch (Exception $e) {
             $this->fail($e->getMessage());
         }
+
         return null;
     }
 
@@ -379,6 +385,7 @@ protected function grabCollector(string $collector, string $function, ?string $m
             if ($message) {
                 $this->fail($message);
             }
+
             $this->fail(
                 sprintf("The '%s' collector is needed to use the '%s' function.", $collector, $function)
             );
@@ -419,12 +426,14 @@ protected function debugResponse($url): void
                 $this->debugSection('User', 'Anonymous');
             }
         }
+
         if ($profile->hasCollector('mailer')) {
             /** @var MessageDataCollector $mailerCollector */
             $mailerCollector = $profile->getCollector('mailer');
             $emails = count($mailerCollector->getEvents()->getMessages());
             $this->debugSection('Emails', $emails . ' sent');
         }
+
         if ($profile->hasCollector('time')) {
             /** @var TimeDataCollector $timeCollector */
             $timeCollector = $profile->getCollector('time');
diff --git a/src/Codeception/Module/Symfony/BrowserAssertionsTrait.php b/src/Codeception/Module/Symfony/BrowserAssertionsTrait.php
index f0c53237..cabd34f2 100644
--- a/src/Codeception/Module/Symfony/BrowserAssertionsTrait.php
+++ b/src/Codeception/Module/Symfony/BrowserAssertionsTrait.php
@@ -50,6 +50,7 @@ public function seePageIsAvailable(string $url = null): void
             $this->amOnPage($url);
             $this->seeInCurrentUrl($url);
         }
+
         $this->assertThat($this->getClient()->getResponse(), new ResponseIsSuccessful());
     }
 
@@ -102,6 +103,7 @@ public function submitSymfonyForm(string $name, array $fields): void
             $fixedKey = sprintf('%s%s', $name, $key);
             $params[$fixedKey] = $value;
         }
+
         $button = sprintf('%s_submit', $name);
 
         $this->submitForm($selector, $params, $button);
diff --git a/src/Codeception/Module/Symfony/DoctrineAssertionsTrait.php b/src/Codeception/Module/Symfony/DoctrineAssertionsTrait.php
index c67653ff..45b770de 100644
--- a/src/Codeception/Module/Symfony/DoctrineAssertionsTrait.php
+++ b/src/Codeception/Module/Symfony/DoctrineAssertionsTrait.php
@@ -4,6 +4,7 @@
 
 namespace Codeception\Module\Symfony;
 
+use Doctrine\ORM\EntityRepository;
 use function class_exists;
 use function get_class;
 use function interface_exists;
@@ -39,6 +40,7 @@ public function grabNumRecords(string $entityClass, array $criteria = []): int
                 ->getQuery()
                 ->getSingleScalarResult();
         }
+
         return $repository->count($criteria);
     }
 
@@ -59,18 +61,20 @@ public function grabNumRecords(string $entityClass, array $criteria = []): int
      */
     public function grabRepository($mixed)
     {
-        $entityRepoClass = '\Doctrine\ORM\EntityRepository';
+        $entityRepoClass = EntityRepository::class;
         $isNotARepo = function () use ($mixed): void {
             $this->fail(
                 sprintf("'%s' is not an entity repository", $mixed)
             );
         };
-        $getRepo = function () use ($mixed, $entityRepoClass, $isNotARepo) {
+        $getRepo = function () use ($mixed, $entityRepoClass, $isNotARepo): ?EntityRepository {
             if (!$repo = $this->grabService($mixed)) return null;
+
             if (!$repo instanceof $entityRepoClass) {
                 $isNotARepo();
                 return null;
             }
+
             return $repo;
         };
 
@@ -123,7 +127,7 @@ public function seeNumRecords(int $expectedNum, string $className, array $criter
             $currentNum,
             sprintf(
                 'The number of found %s (%d) does not match expected number %d with %s',
-                $className, $currentNum, $expectedNum, json_encode($criteria)
+                $className, $currentNum, $expectedNum, json_encode($criteria, JSON_THROW_ON_ERROR)
             )
         );
     }
diff --git a/src/Codeception/Module/Symfony/FormAssertionsTrait.php b/src/Codeception/Module/Symfony/FormAssertionsTrait.php
index 4a14af3c..919d18a7 100644
--- a/src/Codeception/Module/Symfony/FormAssertionsTrait.php
+++ b/src/Codeception/Module/Symfony/FormAssertionsTrait.php
@@ -65,6 +65,7 @@ public function seeFormErrorMessage(string $field, ?string $message = null): voi
                 if (!array_key_exists('errors', $child)) {
                     continue;
                 }
+
                 foreach ($child['errors'] as $error) {
                     $errors[$fieldName] = $error['message'];
                 }
diff --git a/src/Codeception/Module/Symfony/MailerAssertionsTrait.php b/src/Codeception/Module/Symfony/MailerAssertionsTrait.php
index 670d2b69..9ead87ff 100644
--- a/src/Codeception/Module/Symfony/MailerAssertionsTrait.php
+++ b/src/Codeception/Module/Symfony/MailerAssertionsTrait.php
@@ -63,6 +63,7 @@ public function grabLastSentEmail(): ?Email
         if ($lastEmail = end($emails)) {
             return $lastEmail;
         }
+
         return null;
     }
 
diff --git a/src/Codeception/Module/Symfony/RouterAssertionsTrait.php b/src/Codeception/Module/Symfony/RouterAssertionsTrait.php
index 043d4b57..e477b82c 100644
--- a/src/Codeception/Module/Symfony/RouterAssertionsTrait.php
+++ b/src/Codeception/Module/Symfony/RouterAssertionsTrait.php
@@ -68,6 +68,7 @@ public function amOnRoute(string $routeName, array $params = []): void
         if ($router->getRouteCollection()->get($routeName) === null) {
             $this->fail(sprintf('Route with name "%s" does not exists.', $routeName));
         }
+
         $url = $router->generate($routeName, $params);
         $this->amOnPage($url);
     }
@@ -107,6 +108,7 @@ public function seeCurrentActionIs(string $action): void
                 return;
             }
         }
+
         $this->fail("Action '{$action}' does not exist");
     }
 
@@ -130,11 +132,13 @@ public function seeCurrentRouteIs(string $routeName, array $params = []): void
         }
 
         $uri = explode('?', $this->grabFromCurrentUrl())[0];
+        $match = [];
         try {
             $match = $router->match($uri);
         } catch (ResourceNotFoundException $e) {
             $this->fail(sprintf('The "%s" url does not match with any route', $uri));
         }
+
         $expected = array_merge(['_route' => $routeName], $params);
         $intersection = array_intersect_assoc($expected, $match);
 
@@ -160,6 +164,7 @@ public function seeInCurrentRoute(string $routeName): void
         }
 
         $uri = explode('?', $this->grabFromCurrentUrl())[0];
+        $matchedRouteName = '';
         try {
             $matchedRouteName = (string) $router->match($uri)['_route'];
         } catch (ResourceNotFoundException $e) {
diff --git a/src/Codeception/Module/Symfony/SecurityAssertionsTrait.php b/src/Codeception/Module/Symfony/SecurityAssertionsTrait.php
index 674c3153..a8ad24b6 100644
--- a/src/Codeception/Module/Symfony/SecurityAssertionsTrait.php
+++ b/src/Codeception/Module/Symfony/SecurityAssertionsTrait.php
@@ -172,6 +172,7 @@ public function seeUserPasswordDoesNotNeedRehash(UserInterface $user = null): vo
                 $this->fail('No user found to validate');
             }
         }
+
         $hasher = $this->grabPasswordHasherService();
 
         $this->assertFalse($hasher->needsRehash($user), 'User password needs rehash');
diff --git a/src/Codeception/Module/Symfony/ServicesAssertionsTrait.php b/src/Codeception/Module/Symfony/ServicesAssertionsTrait.php
index 1fe2124d..c21289c5 100644
--- a/src/Codeception/Module/Symfony/ServicesAssertionsTrait.php
+++ b/src/Codeception/Module/Symfony/ServicesAssertionsTrait.php
@@ -29,6 +29,7 @@ public function grabService(string $serviceId): object
             $this->fail("Service `{$serviceId}` is required by Codeception, but not loaded by Symfony since you're not using it anywhere in your app.\n
             Recommended solution: Set it to `public` in your `config/services_test.php`/`.yaml`, see https://symfony.com/doc/current/service_container/alias_private.html#marking-services-as-public-private");
         }
+
         return $service;
     }
 
@@ -75,9 +76,11 @@ public function unpersistService(string $serviceName): void
         if (isset($this->persistentServices[$serviceName])) {
             unset($this->persistentServices[$serviceName]);
         }
+
         if (isset($this->permanentServices[$serviceName])) {
             unset($this->permanentServices[$serviceName]);
         }
+
         if ($this->client instanceof SymfonyConnector && isset($this->client->persistentServices[$serviceName])) {
             unset($this->client->persistentServices[$serviceName]);
         }
@@ -89,6 +92,7 @@ protected function getService(string $serviceId): ?object
         if ($container->has($serviceId)) {
             return $container->get($serviceId);
         }
+
         return null;
     }
 }
diff --git a/src/Codeception/Module/Symfony/SessionAssertionsTrait.php b/src/Codeception/Module/Symfony/SessionAssertionsTrait.php
index ee4bc56e..8fdadbb8 100644
--- a/src/Codeception/Module/Symfony/SessionAssertionsTrait.php
+++ b/src/Codeception/Module/Symfony/SessionAssertionsTrait.php
@@ -137,6 +137,7 @@ public function logoutProgrammatically(): void
                 $cookieJar->expire($cookieName);
             }
         }
+
         $cookieJar->flushExpiredCookies();
     }