diff --git a/.scrutinizer.yml b/.scrutinizer.yml
index dac9e20..e394324 100644
--- a/.scrutinizer.yml
+++ b/.scrutinizer.yml
@@ -16,7 +16,7 @@ build:
   dependencies:
     override:
       -
-        command: 'composer require --dev "symfony/symfony:3.4.*" --no-update'
+        command: 'composer require "symfony/symfony:3.4.*" --no-update'
       -
         command: 'composer install --no-interaction -vv --profile --no-progress'
         idle_timeout: 900
diff --git a/.travis.yml b/.travis.yml
index 1dee0c0..949f319 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -16,6 +16,7 @@ php:
 
 env:
   - SYMFONY_VERSION="3.4.*"
+  - SYMFONY_VERSION="~4.1"
 
 # Only send code coverage to Code Climate for the current versions of PHP and Symfony LTS
 # https://github.com/doctrine/doctrine2/blob/3570f4a49afc7e98fed71e0596dded6a39d4fd7b/.travis.yml#L16
@@ -25,7 +26,8 @@ before_install:
  - if [[ $PHPUNIT_FLAGS = "" ]]; then phpenv config-rm xdebug.ini; fi
 
 install:
-  - composer require --dev symfony/symfony:${SYMFONY_VERSION} $DEPENDENCY --no-update
+  - if [[ $SYMFONY_VERSION = '3.4.*' ]]; then composer require symfony/lts:v3 --no-update; fi
+  - composer require symfony/config:${SYMFONY_VERSION} symfony/form:${SYMFONY_VERSION} symfony/framework-bundle:${SYMFONY_VERSION} symfony/templating:${SYMFONY_VERSION} symfony/security-csrf:${SYMFONY_VERSION} symfony/var-dumper:${SYMFONY_VERSION} $DEPENDENCY --no-update
   - composer install --no-interaction --profile --no-progress
 
 script:
diff --git a/README.md b/README.md
index 154b5ea..6cfd0de 100644
--- a/README.md
+++ b/README.md
@@ -46,11 +46,11 @@ This bundle is also used to test several CI (Continuous Integration) services.
 ### Requirements:
 
  - [Twitter keys][Twitter keys]
- - PHP >= 5.5 (required by abraham/twitteroauth 0.6.0)
+ - PHP >= 7.1
  - a database (must be supported by Doctrine2)
- - [Symfony][Symfony GitHub] (2.7 or higher) with [Composer][Composer]. If you want to install it:
+ - [Symfony][Symfony GitHub] (3.4+) with [Composer][Composer]. If you want to install it:
 
-        php composer.phar create-project symfony/framework-standard-edition YOUR_DIRECTORY "2.7.*" -vvv
+        php composer.phar create-project symfony/framework-standard-edition YOUR_DIRECTORY "3.4.*" -vvv
 
 ### Steps:
  
@@ -79,49 +79,24 @@ This bundle is also used to test several CI (Continuous Integration) services.
 ### Usage:
 
  1. Launch this command to fetch tweets: `php app/console statuses:hometimeline --table --env=prod`, with the ` --table` option the imported tweets will be shown
- 2. Update <kbd>app/config/config.yml</kbd> to enable Assetic if it's not activated yet:
- 
-        framework:
-            # ...
-            assets: ~
-
- 3. Import the routes in your <kbd>app/config/routing.yml</kbd>:
+ 2. Import the routes in your <kbd>app/config/routing.yml</kbd>:
  
         asynctweets_website:
             resource: "@AsyncTweetsBundle/Resources/config/routing.yml"
             prefix:   /asynctweets # Use only "/" if you want AsyncTweets at the root of the website
 
- 4. Open the page with your browser `.../YOUR_DIRECTORY/web/asynctweets/` or use the following command `php app/console statuses:read --env=prod` to see tweets
-
- 5. If you have an error `An exception has been thrown during the compilation of a template ("You must add AsyncTweetsBundle to the assetic.bundle config to use the {% image %} tag in AsyncTweetsBundle::layout.html.twig.") in "AsyncTweetsBundle::layout.html.twig".`, add the bundle in assetic bundles:
- 
-        # Assetic Configuration
-        assetic:
-            # ...
-            bundles: [ AsyncTweetsBundle ]
-
- 6. Add `php app/console statuses:hometimeline --env=prod` in your crontab (e.g. every hour) to retrieve tweets automatically
+ 3. Open the page with your browser `.../YOUR_DIRECTORY/web/asynctweets/` or use the following command `php app/console statuses:read --env=prod` to see tweets
+ 4. Add `php app/console statuses:hometimeline --env=prod` in your crontab (e.g. every hour) to retrieve tweets automatically
 
 ## Dependencies
- - [symfony/symfony][Symfony GitHub] (2.7+)
+ - [symfony/symfony][Symfony GitHub] (3.4+)
  - [abraham/twitteroauth][twitteroauth] (^0.6.0)
  - [twitter/bootstrap][Twitter Bootstrap] (use [Bootswatch 3.3.2][Bootstrap CDN])
 
 
 ### Tests:
 
-If `phpunit` is installed:
-
-    phpunit
-
-Or by installing `phpunit` with Composer:
-
-    php composer.phar require --dev phpunit/phpunit "4.8.* || 5.1.*" -vvv ; php vendor/bin/phpunit
-
-### Development environment
-
- - [doctrine/doctrine-fixtures-bundle][doctrine-fixtures-bundle] (~2.3)
- - [liip/functional-test-bundle][functional-test-bundle] (~1.0)
+    php vendor/bin/phpunit 
 
 [Packagist]: https://packagist.org/packages/alexislefebvre/async-tweets-bundle
 [Packagist Stable Image]: https://poser.pugx.org/alexislefebvre/async-tweets-bundle/v/stable.svg
@@ -159,5 +134,3 @@ Or by installing `phpunit` with Composer:
 [twitteroauth]: https://github.com/abraham/twitteroauth
 [Twitter Bootstrap]: https://github.com/twbs/bootstrap
 [Bootstrap CDN]: http://www.bootstrapcdn.com/#bootswatch_tab
-[doctrine-fixtures-bundle]: https://github.com/doctrine/DoctrineFixturesBundle
-[functional-test-bundle]: https://github.com/liip/LiipFunctionalTestBundle
diff --git a/behat.yml b/behat.yml
index 9174366..45e5a03 100644
--- a/behat.yml
+++ b/behat.yml
@@ -5,9 +5,10 @@ default:
                 features: tests/Features
             contexts:
                 - 'Acme\Features\Context\FeatureContext'
-                - Knp\FriendlyContexts\Context\AliceContext
-                - Knp\FriendlyContexts\Context\EntityContext
-                - Knp\FriendlyContexts\Context\MinkContext
+                - 'Acme\Features\Context\DoctrineContext':
+                    doctrine: '@doctrine'
+                - 'Behat\MinkExtension\Context\MinkContext'
+                - behatch:context:browser
     extensions:
         Behat\Symfony2Extension:
             # http://zalas.eu/run-behat-scenarios-and-functional-tests-from-symfony-bundle-in-isolation-of-project/
@@ -20,16 +21,4 @@ default:
             sessions:
                 default:
                     symfony2: ~
-        Knp\FriendlyContexts\Extension:
-            symfony_kernel:
-                bootstrap: tests/App/bootstrap.php
-                path: tests/App/AppKernel.php
-                class: AppKernel
-                env: test
-                debug: true
-            alice:
-                fixtures:
-                    User: tests/Fixtures/User.yml
-                    Tweet: tests/Fixtures/Tweet.yml
-                dependencies:
-                    Tweet: [ User ]
+        Behatch\Extension: ~
diff --git a/circle.yml b/circle.yml
index 36dece2..7970fcd 100644
--- a/circle.yml
+++ b/circle.yml
@@ -9,7 +9,7 @@ dependencies:
     - sed -i 's/^;//' /opt/circleci/php/$(phpenv global)/etc/conf.d/xdebug.ini
     - rm /opt/circleci/php/$(phpenv global)/etc/conf.d/xdebug.ini
   override:
-    - composer require --dev "symfony/symfony:3.4.*" --no-update
+    - composer require "symfony/symfony:3.4.*" --no-update
     - composer install --no-interaction --profile --no-progress
   cache_directories:
     - ~/.composer/cache
diff --git a/composer.json b/composer.json
index f0bd4cc..fdbc8a6 100644
--- a/composer.json
+++ b/composer.json
@@ -14,23 +14,30 @@
     "require" : {
         "php": ">=7.0",
         "ext-mbstring": "*",
-        "symfony/symfony": "~3.4",
+        "symfony/config": "~3.4|~4.0",
+        "symfony/form": "~3.4|~4.0",
+        "symfony/framework-bundle": "~3.4|~4.0",
+        "symfony/security-csrf": "~3.4|~4.0",
+        "symfony/templating": "~3.4|~4.0",
+        "symfony/twig-bundle": "~3.4|~4.0",
+        "symfony/var-dumper": "~3.4|~4.0",
+        "doctrine/orm": "^2.4.8",
         "abraham/twitteroauth": "~0.6"
     },
     "require-dev": {
-        "doctrine/orm": "^2.4.8",
-        "symfony/assetic-bundle": "~2.3",
         "symfony/monolog-bundle": "~3.1",
         "doctrine/doctrine-fixtures-bundle": "^3.0",
         "liip/functional-test-bundle": "~2.0@alpha",
         "phpunit/phpunit": "~6.5.6|~7.0",
-        "knplabs/friendly-contexts": "~0.8",
         "behat/behat": "~3.2",
         "behat/symfony2-extension": "^2.1",
         "behat/mink": "^1.7",
         "behat/mink-extension": "~2.2",
         "behat/mink-browserkit-driver": "~1.3",
-        "phpspec/phpspec": "~3.4||~4.2"
+        "phpspec/phpspec": "~3.4||~4.2",
+        "doctrine/data-fixtures": "^1.3",
+        "nelmio/alice": "^3.4",
+        "behatch/contexts": "^3.1"
     },
     "autoload" : {
         "psr-4" : {
diff --git a/tests/App/AppKernel.php b/tests/App/AppKernel.php
index efd1f21..5939e41 100644
--- a/tests/App/AppKernel.php
+++ b/tests/App/AppKernel.php
@@ -27,10 +27,8 @@ public function registerBundles()
     {
         $bundles = [
             new \Symfony\Bundle\FrameworkBundle\FrameworkBundle(),
-            new \Symfony\Bundle\SecurityBundle\SecurityBundle(),
             new \Symfony\Bundle\TwigBundle\TwigBundle(),
             new \Symfony\Bundle\MonologBundle\MonologBundle(),
-            new \Symfony\Bundle\AsseticBundle\AsseticBundle(),
             new \Doctrine\Bundle\DoctrineBundle\DoctrineBundle(),
             new \AlexisLefebvre\Bundle\AsyncTweetsBundle\AsyncTweetsBundle(),
             new \Doctrine\Bundle\FixturesBundle\DoctrineFixturesBundle(),
diff --git a/tests/App/config.yml b/tests/App/config.yml
index 4846542..680835a 100644
--- a/tests/App/config.yml
+++ b/tests/App/config.yml
@@ -14,9 +14,6 @@ framework:
         storage_id: session.storage.filesystem 
     profiler:
         collect: false
-    # Enable Assetic
-    # see https://github.com/symfony/assetic-bundle/issues/396#issuecomment-160986958
-    assets: ~
 
 monolog:
     handlers:
@@ -26,7 +23,7 @@ monolog:
             handler:      nested
         nested:
             type:  stream
-            path:  %kernel.logs_dir%/%kernel.environment%.log
+            path:  "%kernel.logs_dir%/%kernel.environment%.log"
             level: debug
 
 liip_functional_test:
@@ -39,7 +36,7 @@ doctrine:
         connections:
             default:
                 driver: pdo_sqlite
-                path: %kernel.cache_dir%/test.db
+                path: "%kernel.cache_dir%/test.db"
     orm:
         auto_generate_proxy_classes: "%kernel.debug%"
         auto_mapping: true            
diff --git a/tests/Features/Context/DoctrineContext.php b/tests/Features/Context/DoctrineContext.php
new file mode 100644
index 0000000..a1d6237
--- /dev/null
+++ b/tests/Features/Context/DoctrineContext.php
@@ -0,0 +1,97 @@
+<?php
+
+namespace Acme\Features\Context;
+
+use Behat\Behat\Context\Context;
+use Behat\Gherkin\Node\TableNode;
+use Doctrine\Common\DataFixtures\Executor\ORMExecutor;
+use Doctrine\Common\DataFixtures\Purger\ORMPurger;
+use Doctrine\Common\Persistence\ObjectManager;
+use Doctrine\ORM\Tools\SchemaTool;
+use Nelmio\Alice\Loader\NativeLoader;
+use Symfony\Bridge\Doctrine\ManagerRegistry;
+
+class DoctrineContext implements Context
+{
+    /**
+     * @var ObjectManager
+     */
+    private $manager;
+
+    /**
+     * @var SchemaTool
+     */
+    private $schemaTool;
+
+    /**
+     * @var array
+     */
+    private $classes;
+
+    /**
+     * @var \Nelmio\Alice\Loader\NativeLoader
+     */
+    private $nativeLoader;
+
+    /**
+     * @var \Nelmio\Alice\ObjectSet
+     */
+    private $objectSet;
+
+    public function __construct(
+        ManagerRegistry $doctrine
+    ) {
+        $this->manager = $doctrine->getManager();
+        $this->schemaTool = new SchemaTool($this->manager);
+        $this->classes = $this->manager->getMetadataFactory()->getAllMetadata();
+    }
+
+    /**
+     * @BeforeScenario
+     */
+    public function dropData()
+    {
+        $purger = new ORMPurger();
+        $purger->setPurgeMode(ORMPurger::PURGE_MODE_DELETE);
+
+        $executor = new ORMExecutor($this->manager, $purger);
+        $executor->execute([]);
+    }
+
+    /**
+     * @AfterScenario @dropSchema
+     */
+    public function dropDatabase()
+    {
+        $this->schemaTool->dropSchema($this->classes);
+    }
+
+    /**
+     * @When I load the following fixtures:
+     */
+    public function loadFixtures(TableNode $data)
+    {
+        $this->nativeLoader = new NativeLoader();
+
+        $files = [];
+
+        foreach ($data->getRows() as $row) {
+            $name = $row[0];
+            $filePath = sprintf('%s/../../Fixtures/%s.yml', __DIR__, $name);
+
+            if (!file_exists($filePath)) {
+                throw new \RuntimeException(sprintf('File %s not found', $name));
+            }
+
+            $files[] = $filePath;
+        }
+
+        $this->objectSet = $this->nativeLoader->loadFiles($files)->getObjects();
+
+        foreach ($this->objectSet as $object) {
+            $this->manager->persist($object);
+        }
+
+        $this->manager->flush();
+    }
+}
diff --git a/tests/Features/Controller/Controller.feature b/tests/Features/Controller/Controller.feature
index 9aa3aa9..84e1ffd 100644
--- a/tests/Features/Controller/Controller.feature
+++ b/tests/Features/Controller/Controller.feature
@@ -1,8 +1,7 @@
-@reset-schema
 Feature: Test DefaultController
 
   Scenario: Index
-    When I am on the homepage
+    When I am on "/"
     Then I should see a "html > body" element
     And I should see a "html > head > title" element
     And I should see "Home timeline" in the "html > head > title" element
diff --git a/tests/Features/Controller/ControllerWithFixtures.feature b/tests/Features/Controller/ControllerWithFixtures.feature
index b0d9c9b..32b7d6f 100644
--- a/tests/Features/Controller/ControllerWithFixtures.feature
+++ b/tests/Features/Controller/ControllerWithFixtures.feature
@@ -1,9 +1,12 @@
-@reset-schema
-@alice(*)
 Feature: Test DefaultController with Fixtures
 
+  Background:
+    Given I load the following fixtures:
+      | User  |
+      | Tweet |
+
   Scenario: Index
-    When I am on the homepage
+    When I am on "/"
     Then I should see a "html > body" element
     And I should see a "html > head > title" element
     And I should see "Home timeline" in the "html > head > title" element
@@ -26,10 +29,10 @@ Feature: Test DefaultController with Fixtures
     And I should see "3 pending tweets" in the "body > main.container > div.navigation.row > div.count.alert.alert-info" element
     # There is no message about deleted tweets
     And I should not see a "div.alert.alert-success" element
-    When I press the 2nd "Mark as read" link
+    When I follow the 2nd "Mark as read" link
     Then I should not see a "div.alert.alert-success" element
     # Delete old tweets
-    When I press the "Delete old tweets" link
+    When I follow "Delete old tweets"
     Then I should see a "div.alert.alert-success" element
     And I should see "1 tweets deleted." in the "div.alert.alert-success" element
     And I should see a "main.container > div.tweets" element
diff --git a/tests/Fixtures/Tweet.yml b/tests/Fixtures/Tweet.yml
index 0e6be33..da904a6 100644
--- a/tests/Fixtures/Tweet.yml
+++ b/tests/Fixtures/Tweet.yml
@@ -1,7 +1,7 @@
 AlexisLefebvre\Bundle\AsyncTweetsBundle\Entity\Tweet:
     tweet{1..3}:
         id: <current()>
-        created_at: <date()>
+        created_at: <(new \DateTime())>
         text: "Tweet <current()>"
         user: '@user<current()>'
         retweet_count: 42