diff --git a/.travis.yml b/.travis.yml
index e937fc1..3ae989d 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -18,6 +18,7 @@ before_install:
 
 install:
     - composer require symfony/http-kernel:${SYMFONY_VERSION} --no-update --no-scripts --prefer-dist
+    - composer require symfony/dotenv:${SYMFONY_VERSION} --no-update --no-scripts --prefer-dist
     - composer require --dev symfony/framework-bundle:${SYMFONY_VERSION} --no-update --no-scripts --prefer-dist
     - composer update --prefer-dist
 
diff --git a/README.md b/README.md
index 740fd17..0e705e6 100644
--- a/README.md
+++ b/README.md
@@ -27,4 +27,29 @@ ensures that application behaviour will not be affected by stateful services.
             FriendsOfBehat\SymfonyExtension: ~
     ```
 
+**Symfony 3 configuration**
+
+```
+FriendsOfBehat\SymfonyExtension:
+    kernel:
+        bootstrap: 'var/bootstrap.php.cache'
+        path: app/AppKernel.php
+        class: 'AppKernel'
+        env: test
+        debug: true
+```
+
+**Symfony 4 configuration**
+
+```
+FriendsOfBehat\SymfonyExtension:
+    env_file: .env
+    kernel:
+        class: 'MyTrip\Kernel'
+        path: src/Kernel.php
+        debug: true
+```
+
+Symfony 4 does not have bootstrap file anymore and the environment is configured in the .env file.
+
 3. Good luck & have fun!
diff --git a/composer.json b/composer.json
index 2152b6f..d6784c0 100644
--- a/composer.json
+++ b/composer.json
@@ -13,7 +13,8 @@
         "php": "^7.1",
 
         "behat/behat": "^3.1",
-        "symfony/http-kernel": "^3.3|^4.0"
+        "symfony/http-kernel": "^3.3|^4.0",
+        "symfony/dotenv": "^3.3|^4.0"
     },
     "require-dev": {
         "behat/mink": "^1.7",
diff --git a/features/not_crashing_behat.feature b/features/not_crashing_behat.feature
index a973f8d..7fc7f9b 100644
--- a/features/not_crashing_behat.feature
+++ b/features/not_crashing_behat.feature
@@ -56,3 +56,36 @@ Feature: Not crashing Behat
         And a feature file with passing scenario
         When I run Behat
         Then it should pass
+
+    Scenario: This extension boot a Symfony4 kernel
+        Given a Behat configuration containing:
+        """
+        default:
+            extensions:
+                FriendsOfBehat\SymfonyExtension:
+                    env_file: .env_in_memory
+                    kernel:
+                        path: src/MyKernel.php
+                        class: MyKernel
+                        bootstrap: ~
+        """
+        And a file ".env_in_memory" containing:
+        """
+        APP_ENV=dev
+        """
+        And a file "src/MyKernel.php" containing:
+        """
+        <?php
+
+        use Symfony\Component\HttpKernel\Kernel;
+        use Symfony\Component\Config\Loader\LoaderInterface;
+
+        class MyKernel extends Kernel
+        {
+            public function registerBundles() { return []; }
+            public function registerContainerConfiguration(LoaderInterface $loader) {}
+        }
+        """
+        And a feature file with passing scenario
+        When I run Behat
+        Then it should pass
diff --git a/src/ServiceContainer/SymfonyExtension.php b/src/ServiceContainer/SymfonyExtension.php
index 3f89f9a..10afb25 100644
--- a/src/ServiceContainer/SymfonyExtension.php
+++ b/src/ServiceContainer/SymfonyExtension.php
@@ -27,6 +27,7 @@ use Symfony\Component\DependencyInjection\Container;
 use Symfony\Component\DependencyInjection\ContainerBuilder;
 use Symfony\Component\DependencyInjection\Definition;
 use Symfony\Component\DependencyInjection\Reference;
+use Symfony\Component\Dotenv\Dotenv;
 
 final class SymfonyExtension implements Extension
 {
@@ -60,6 +61,16 @@ final class SymfonyExtension implements Extension
      */
     const SHARED_KERNEL_CONTAINER_ID = 'sylius_symfony_extension.shared_kernel.container';
 
+    /**
+     * Default symfony environment used to run your suites.
+     */
+    private const DEFAULT_ENV = 'test';
+
+    /**
+     * Enable or disable the debug mode
+     */
+    private const DEBUG_MODE = false;
+
     /**
      * @var CrossContainerProcessor|null
      */
@@ -90,6 +101,7 @@ final class SymfonyExtension implements Extension
         $builder
             ->addDefaultsIfNotSet()
                 ->children()
+                    ->scalarNode('env_file')->defaultNull()->end()
                     ->arrayNode('kernel')
                         ->addDefaultsIfNotSet()
                         ->children()
@@ -110,6 +122,16 @@ final class SymfonyExtension implements Extension
      */
     public function load(ContainerBuilder $container, array $config): void
     {
+        if (null !== $config['env_file']) {
+            $this->loadEnvVars($container, $config['env_file']);
+
+            $environment = false !== getenv('APP_ENV') ? getenv('APP_ENV') : self::DEFAULT_ENV;
+            $debugMode = false !== getenv('APP_DEBUG') ? getenv('APP_DEBUG') : self::DEBUG_MODE;
+
+            $config['kernel']['env'] = $environment;
+            $config['kernel']['kernel'] = $debugMode;
+        }
+
         $this->loadKernel($container, $config['kernel']);
         $this->loadKernelContainer($container);
 
@@ -129,6 +151,16 @@ final class SymfonyExtension implements Extension
     {
     }
 
+    /**
+     * @param ContainerBuilder $container
+     * @param string $fileName
+     */
+    private function loadEnvVars(ContainerBuilder $container, string $fileName): void
+    {
+        $envFilePath = sprintf('%s/%s', $container->getParameter('paths.base'), $fileName);
+        (new Dotenv())->load($envFilePath);
+    }
+
     /**
      * @param ContainerBuilder $container
      */
@@ -203,6 +235,8 @@ final class SymfonyExtension implements Extension
 
     /**
      * @param ContainerBuilder $container
+     *
+     * @throws \Exception
      */
     private function declareSymfonyContainers(ContainerBuilder $container): void
     {