diff --git a/.travis.yml b/.travis.yml
index 517928a5..e003ff4b 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -18,10 +18,14 @@ matrix:
         - php: 7.2
         - php: 7.3
           env: deps=low
+        - php: 7.4
+          env: SYMFONY_PHPUNIT_VERSION=9.4
+        - php: nightly
+          env: SYMFONY_PHPUNIT_VERSION=9.4
 
 before_install:
     - phpenv config-rm xdebug.ini || true
-    - composer global require --no-progress --no-scripts --no-plugins symfony/flex dev-master
+    - composer global require --no-progress --no-scripts --no-plugins symfony/flex dev-main
 
 install:
     - |
diff --git a/composer.json b/composer.json
index f7f5d3e4..e6fab536 100644
--- a/composer.json
+++ b/composer.json
@@ -21,7 +21,7 @@
     },
     "minimum-stability": "dev",
     "require": {
-        "php": "^7.1.3",
+        "php": ">=7.1.3",
         "symfony/asset": "^3.4 || ^4.0 || ^5.0",
         "symfony/config": "^3.4 || ^4.0 || ^5.0",
         "symfony/dependency-injection": "^3.4 || ^4.0 || ^5.0",
diff --git a/tests/Asset/TagRendererTest.php b/tests/Asset/TagRendererTest.php
index 25131807..9279c4ee 100644
--- a/tests/Asset/TagRendererTest.php
+++ b/tests/Asset/TagRendererTest.php
@@ -13,8 +13,8 @@
 use Symfony\Component\Asset\Packages;
 use Symfony\WebpackEncoreBundle\Asset\EntrypointLookupCollection;
 use Symfony\WebpackEncoreBundle\Asset\EntrypointLookupInterface;
-use Symfony\WebpackEncoreBundle\Asset\IntegrityDataProviderInterface;
 use Symfony\WebpackEncoreBundle\Asset\TagRenderer;
+use Symfony\WebpackEncoreBundle\Tests\TestEntrypointLookupIntegrityDataProviderInterface;
 
 class TagRendererTest extends TestCase
 {
@@ -138,10 +138,7 @@ public function testRenderScriptTagsWithinAnEntryPointCollection()
 
     public function testRenderScriptTagsWithHashes()
     {
-        $entrypointLookup = $this->createMock([
-            EntrypointLookupInterface::class,
-            IntegrityDataProviderInterface::class,
-        ]);
+        $entrypointLookup = $this->createMock(TestEntrypointLookupIntegrityDataProviderInterface::class);
         $entrypointLookup->expects($this->once())
             ->method('getJavaScriptFiles')
             ->willReturn(['/build/file1.js', '/build/file2.js']);
diff --git a/tests/EventListener/ExceptionListenerTest.php b/tests/EventListener/ExceptionListenerTest.php
index 7e0df5a0..b23a2910 100644
--- a/tests/EventListener/ExceptionListenerTest.php
+++ b/tests/EventListener/ExceptionListenerTest.php
@@ -10,6 +10,7 @@
 namespace Symfony\WebpackEncoreBundle\Tests\EventListener;
 
 use Symfony\Component\HttpFoundation\Request;
+use Symfony\Component\HttpKernel\Event\ExceptionEvent;
 use Symfony\Component\HttpKernel\Event\GetResponseForExceptionEvent;
 use Symfony\Component\HttpKernel\HttpKernelInterface;
 use PHPUnit\Framework\TestCase;
@@ -39,7 +40,10 @@ public function testItResetsAllEntrypointLookups()
 
         $request = new Request();
         $exception = new \Exception();
-        $event = new GetResponseForExceptionEvent(
+        $exceptionEventClass = class_exists(ExceptionEvent::class)
+            ? ExceptionEvent::class
+            : GetResponseForExceptionEvent::class;
+        $event = new $exceptionEventClass(
             $this->createMock(HttpKernelInterface::class),
             $request,
             HttpKernelInterface::MASTER_REQUEST,
diff --git a/tests/IntegrationTest.php b/tests/IntegrationTest.php
index 4a28959f..2cf8da5d 100644
--- a/tests/IntegrationTest.php
+++ b/tests/IntegrationTest.php
@@ -36,9 +36,9 @@ public function testTwigIntegration()
     {
         $kernel = new WebpackEncoreIntegrationTestKernel(true);
         $kernel->boot();
-        $container = $kernel->getContainer();
+        $twig = $this->getTwigEnvironmentFromBootedKernel($kernel);
 
-        $html1 = $container->get('twig')->render('@integration_test/template.twig');
+        $html1 = $twig->render('@integration_test/template.twig');
         $this->assertStringContainsString(
             '<script src="/build/file1.js" integrity="sha384-Q86c+opr0lBUPWN28BLJFqmLhho+9ZcJpXHorQvX6mYDWJ24RQcdDarXFQYN8HLc"></script>',
             $html1
@@ -58,7 +58,7 @@ public function testTwigIntegration()
             $html1
         );
 
-        $html2 = $container->get('twig')->render('@integration_test/manual_template.twig');
+        $html2 = $twig->render('@integration_test/manual_template.twig');
         $this->assertStringContainsString(
             '<script src="/build/file3.js"></script>',
             $html2
@@ -73,10 +73,10 @@ public function testEntriesAreNotRepeatedWhenAlreadyOutputIntegration()
     {
         $kernel = new WebpackEncoreIntegrationTestKernel(true);
         $kernel->boot();
-        $container = $kernel->getContainer();
+        $twig = $this->getTwigEnvironmentFromBootedKernel($kernel);
 
-        $html1 = $container->get('twig')->render('@integration_test/template.twig');
-        $html2 = $container->get('twig')->render('@integration_test/manual_template.twig');
+        $html1 = $twig->render('@integration_test/template.twig');
+        $html2 = $twig->render('@integration_test/manual_template.twig');
         $this->assertStringContainsString(
             '<script src="/build/file3.js"></script>',
             $html2
@@ -102,7 +102,7 @@ public function testCacheWarmer()
     {
         $kernel = new WebpackEncoreIntegrationTestKernel(true);
         $kernel->boot();
-        $container = $kernel->getContainer();
+        $container = $this->getContainerFromBootedKernel($kernel);
 
         $cacheWarmer = $container->get(WebpackEncoreCacheWarmerTester::class);
 
@@ -124,8 +124,8 @@ public function testEnabledStrictMode_throwsException_ifBuildMissing()
         $kernel->outputPath = 'missing_build';
         $kernel->builds = ['different_build' => 'missing_build'];
         $kernel->boot();
-        $container = $kernel->getContainer();
-        $container->get('twig')->render('@integration_test/template.twig');
+        $twig = $this->getTwigEnvironmentFromBootedKernel($kernel);
+        $twig->render('@integration_test/template.twig');
     }
 
     public function testDisabledStrictMode_ignoresMissingBuild()
@@ -135,8 +135,8 @@ public function testDisabledStrictMode_ignoresMissingBuild()
         $kernel->strictMode = false;
         $kernel->builds = ['different_build' => 'missing_build'];
         $kernel->boot();
-        $container = $kernel->getContainer();
-        $html = $container->get('twig')->render('@integration_test/template.twig');
+        $twig = $this->getTwigEnvironmentFromBootedKernel($kernel);
+        $html = $twig->render('@integration_test/template.twig');
         self::assertSame('', trim($html));
     }
 
@@ -144,7 +144,7 @@ public function testAutowireableInterfaces()
     {
         $kernel = new WebpackEncoreIntegrationTestKernel(true);
         $kernel->boot();
-        $container = $kernel->getContainer();
+        $container = $this->getContainerFromBootedKernel($kernel);
         $this->assertInstanceOf(WebpackEncoreAutowireTestService::class, $container->get(WebpackEncoreAutowireTestService::class));
     }
 
@@ -152,7 +152,7 @@ public function testPreload()
     {
         $kernel = new WebpackEncoreIntegrationTestKernel(true);
         $kernel->boot();
-        $container = $kernel->getContainer();
+        $container = $this->getContainerFromBootedKernel($kernel);
 
         /** @var TagRenderer $tagRenderer */
         $tagRenderer = $container->get('public.webpack_encore.tag_renderer');
@@ -168,7 +168,7 @@ public function testAutowireDefaultBuildArgument()
     {
         $kernel = new WebpackEncoreIntegrationTestKernel(true);
         $kernel->boot();
-        $container = $kernel->getContainer();
+        $container = $this->getContainerFromBootedKernel($kernel);
 
         $container->get('public.webpack_encore.entrypoint_lookup_collection')
             ->getEntrypointLookup();
@@ -176,6 +176,26 @@ public function testAutowireDefaultBuildArgument()
         // Testing that it doesn't throw an exception is enough
         $this->assertTrue(true);
     }
+
+    private function getContainerFromBootedKernel(WebpackEncoreIntegrationTestKernel $kernel)
+    {
+        if ($kernel::VERSION_ID >= 40100) {
+            return $kernel->getContainer()->get('test.service_container');
+        }
+
+        return $kernel->getContainer();
+    }
+
+    private function getTwigEnvironmentFromBootedKernel(WebpackEncoreIntegrationTestKernel $kernel)
+    {
+        $container = $this->getContainerFromBootedKernel($kernel);
+
+        if ($container->has(\Twig\Environment::class)) {
+            return $container->get(\Twig\Environment::class);
+        }
+
+        return $container->get('twig');
+    }
 }
 
 abstract class AbstractWebpackEncoreIntegrationTestKernel extends Kernel
@@ -206,12 +226,19 @@ public function registerBundles()
 
     protected function configureContainer(ContainerBuilder $container, LoaderInterface $loader)
     {
-        $container->loadFromExtension('framework', [
+        $frameworkConfig = [
             'secret' => 'foo',
             'assets' => [
                 'enabled' => $this->enableAssets,
             ],
-        ]);
+            'test' => true,
+        ];
+        if (AbstractWebpackEncoreIntegrationTestKernel::VERSION_ID >= 50100) {
+            $frameworkConfig['router'] = [
+                'utf8' => true,
+            ];
+        }
+        $container->loadFromExtension('framework', $frameworkConfig);
 
         $container->loadFromExtension('twig', [
             'paths' => [
@@ -238,10 +265,10 @@ protected function configureContainer(ContainerBuilder $container, LoaderInterfa
             ->setPublic(true);
 
         $container->setAlias(new Alias('public.webpack_encore.tag_renderer', true), 'webpack_encore.tag_renderer');
-        $container->getAlias('public.webpack_encore.tag_renderer')->setPrivate(false);
+        $container->getAlias('public.webpack_encore.tag_renderer')->setPublic(true);
 
         $container->setAlias(new Alias('public.webpack_encore.entrypoint_lookup_collection', true), 'webpack_encore.entrypoint_lookup_collection');
-        $container->getAlias('public.webpack_encore.entrypoint_lookup_collection')->setPrivate(false);
+        $container->getAlias('public.webpack_encore.entrypoint_lookup_collection')->setPublic(true);
 
         // avoid logging request logs
         $container->register('logger', Logger::class)
@@ -264,11 +291,11 @@ public function renderFoo()
     }
 }
 
-if (method_exists(AbstractWebpackEncoreIntegrationTestKernel::class, 'configureRouting')) {
+if (AbstractWebpackEncoreIntegrationTestKernel::VERSION_ID >= 50100) {
     class WebpackEncoreIntegrationTestKernel extends AbstractWebpackEncoreIntegrationTestKernel {
         protected function configureRouting(RoutingConfigurator $routes): void
         {
-            $routes->add('/foo', 'kernel:'.(parent::VERSION_ID >= 40100 ? ':' : '').'renderFoo');
+            $routes->add('/foo', 'kernel::renderFoo');
         }
     }
 } else {
diff --git a/tests/TestEntrypointLookupIntegrityDataProviderInterface.php b/tests/TestEntrypointLookupIntegrityDataProviderInterface.php
new file mode 100644
index 00000000..2152b552
--- /dev/null
+++ b/tests/TestEntrypointLookupIntegrityDataProviderInterface.php
@@ -0,0 +1,17 @@
+<?php
+
+/*
+ * This file is part of the Symfony WebpackEncoreBundle package.
+ * (c) Fabien Potencier <fabien@symfony.com>
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Symfony\WebpackEncoreBundle\Tests;
+
+use Symfony\WebpackEncoreBundle\Asset\EntrypointLookupInterface;
+use Symfony\WebpackEncoreBundle\Asset\IntegrityDataProviderInterface;
+
+interface TestEntrypointLookupIntegrityDataProviderInterface extends EntrypointLookupInterface, IntegrityDataProviderInterface
+{
+}