diff --git a/Controller/DocumentationController.php b/Controller/DocumentationController.php
index dd28427..0450d3a 100644
--- a/Controller/DocumentationController.php
+++ b/Controller/DocumentationController.php
@@ -11,11 +11,9 @@
 
 namespace Nelmio\ApiDocBundle\Controller;
 
-use Nelmio\ApiDocBundle\ApiDocGenerator;
 use OpenApi\Annotations\OpenApi;
 use OpenApi\Annotations\Server;
 use Psr\Container\ContainerInterface;
-use Symfony\Component\DependencyInjection\ServiceLocator;
 use Symfony\Component\HttpFoundation\JsonResponse;
 use Symfony\Component\HttpFoundation\Request;
 use Symfony\Component\HttpKernel\Exception\BadRequestHttpException;
@@ -24,22 +22,8 @@ final class DocumentationController
 {
     private $generatorLocator;
 
-    /**
-     * @param ContainerInterface $generatorLocator
-     */
-    public function __construct($generatorLocator)
+    public function __construct(ContainerInterface $generatorLocator)
     {
-        if (!$generatorLocator instanceof ContainerInterface) {
-            if (!$generatorLocator instanceof ApiDocGenerator) {
-                throw new \InvalidArgumentException(sprintf('Providing an instance of "%s" to "%s" is not supported.', get_class($generatorLocator), __METHOD__));
-            }
-
-            @trigger_error(sprintf('Providing an instance of "%s" to "%s()" is deprecated since version 3.1. Provide it an instance of "%s" instead.', ApiDocGenerator::class, __METHOD__, ContainerInterface::class), E_USER_DEPRECATED);
-            $generatorLocator = new ServiceLocator(['default' => function () use ($generatorLocator): ApiDocGenerator {
-                return $generatorLocator;
-            }]);
-        }
-
         $this->generatorLocator = $generatorLocator;
     }
 
diff --git a/Controller/SwaggerUiController.php b/Controller/SwaggerUiController.php
index ebff95b..b927d00 100644
--- a/Controller/SwaggerUiController.php
+++ b/Controller/SwaggerUiController.php
@@ -11,11 +11,9 @@
 
 namespace Nelmio\ApiDocBundle\Controller;
 
-use Nelmio\ApiDocBundle\ApiDocGenerator;
 use OpenApi\Annotations\OpenApi;
 use OpenApi\Annotations\Server;
 use Psr\Container\ContainerInterface;
-use Symfony\Component\DependencyInjection\ServiceLocator;
 use Symfony\Component\HttpFoundation\Request;
 use Symfony\Component\HttpFoundation\Response;
 use Symfony\Component\HttpKernel\Exception\BadRequestHttpException;
@@ -27,26 +25,12 @@ final class SwaggerUiController
 
     private $twig;
 
-    /**
-     * @param ContainerInterface $generatorLocator
-     */
-    public function __construct($generatorLocator, $twig)
+    public function __construct(ContainerInterface $generatorLocator, $twig)
     {
         if (!$twig instanceof \Twig_Environment && !$twig instanceof Environment) {
             throw new \InvalidArgumentException(sprintf('Providing an instance of "%s" as twig is not supported.', get_class($twig)));
         }
 
-        if (!$generatorLocator instanceof ContainerInterface) {
-            if (!$generatorLocator instanceof ApiDocGenerator) {
-                throw new \InvalidArgumentException(sprintf('Providing an instance of "%s" to "%s" is not supported.', get_class($generatorLocator), __METHOD__));
-            }
-
-            @trigger_error(sprintf('Providing an instance of "%s" to "%s()" is deprecated since version 3.1. Provide it an instance of "%s" instead.', ApiDocGenerator::class, __METHOD__, ContainerInterface::class), E_USER_DEPRECATED);
-            $generatorLocator = new ServiceLocator(['default' => function () use ($generatorLocator): ApiDocGenerator {
-                return $generatorLocator;
-            }]);
-        }
-
         $this->generatorLocator = $generatorLocator;
         $this->twig = $twig;
     }
diff --git a/DependencyInjection/Configuration.php b/DependencyInjection/Configuration.php
index 1b97a9f..797b59c 100644
--- a/DependencyInjection/Configuration.php
+++ b/DependencyInjection/Configuration.php
@@ -28,24 +28,6 @@ final class Configuration implements ConfigurationInterface
         }
 
         $rootNode
-            ->beforeNormalization()
-                ->ifTrue(function ($v) {
-                    return !isset($v['areas']) && isset($v['routes']);
-                })
-                ->then(function ($v) {
-                    $v['areas'] = $v['routes'];
-                    unset($v['routes']);
-                    @trigger_error('The `nelmio_api_doc.routes` config option is deprecated. Please use `nelmio_api_doc.areas` instead (just replace `routes` by `areas` in your config).', E_USER_DEPRECATED);
-
-                    return $v;
-                })
-            ->end()
-            ->beforeNormalization()
-                ->ifTrue(function ($v) {
-                    return isset($v['routes']);
-                })
-                ->thenInvalid('You must not use both `nelmio_api_doc.areas` and `nelmio_api_doc.routes` config options. Please update your config to only use `nelmio_api_doc.areas`.')
-            ->end()
             ->children()
                 ->arrayNode('documentation')
                     ->useAttributeAsKey('key')
diff --git a/Tests/Controller/ControllersTest.php b/Tests/Controller/ControllersTest.php
deleted file mode 100644
index 3c83e0d..0000000
--- a/Tests/Controller/ControllersTest.php
+++ /dev/null
@@ -1,47 +0,0 @@
-<?php
-
-/*
- * This file is part of the NelmioApiDocBundle package.
- *
- * (c) Nelmio
- *
- * For the full copyright and license information, please view the LICENSE
- * file that was distributed with this source code.
- */
-
-namespace Nelmio\ApiDocBundle\Tests\Controller;
-
-use Nelmio\ApiDocBundle\ApiDocGenerator;
-use Nelmio\ApiDocBundle\Controller\DocumentationController;
-use Nelmio\ApiDocBundle\Controller\SwaggerUiController;
-use PHPUnit\Framework\TestCase;
-use Symfony\Component\HttpFoundation\Request;
-
-class ControllersTest extends TestCase
-{
-    /**
-     * @group legacy
-     * @expectedDeprecation Providing an instance of "Nelmio\ApiDocBundle\ApiDocGenerator" to "Nelmio\ApiDocBundle\Controller\SwaggerUiController::__construct()" is deprecated since version 3.1. Provide it an instance of "Psr\Container\ContainerInterface" instead.
-     */
-    public function testSwaggerUiControllerInstanciation()
-    {
-        if (class_exists('Twig_Environment')) {
-            $twigMock = $this->createMock('Twig_Environment');
-        } else {
-            $twigMock = $this->createMock('Twig\Environment');
-        }
-
-        $controller = new SwaggerUiController(new ApiDocGenerator([], []), $twigMock);
-        $controller(new Request());
-    }
-
-    /**
-     * @group legacy
-     * @expectedDeprecation Providing an instance of "Nelmio\ApiDocBundle\ApiDocGenerator" to "Nelmio\ApiDocBundle\Controller\DocumentationController::__construct()" is deprecated since version 3.1. Provide it an instance of "Psr\Container\ContainerInterface" instead.
-     */
-    public function testDocumentationControllerInstanciation()
-    {
-        $controller = new DocumentationController(new ApiDocGenerator([], []));
-        $controller(new Request());
-    }
-}
diff --git a/Tests/DependencyInjection/ConfigurationTest.php b/Tests/DependencyInjection/ConfigurationTest.php
index 3a7d545..306d706 100644
--- a/Tests/DependencyInjection/ConfigurationTest.php
+++ b/Tests/DependencyInjection/ConfigurationTest.php
@@ -144,39 +144,4 @@ class ConfigurationTest extends TestCase
             ],
         ], $config['models']['names']);
     }
-
-    /**
-     * @group legacy
-     */
-    public function testBothAreasAndRoutes()
-    {
-        $this->expectException(\InvalidArgumentException::class);
-        $this->expectExceptionMessage('You must not use both `nelmio_api_doc.areas` and `nelmio_api_doc.routes` config options. Please update your config to only use `nelmio_api_doc.areas`.');
-
-        $processor = new Processor();
-        $config = $processor->processConfiguration(new Configuration(), [['areas' => [], 'routes' => []]]);
-    }
-
-    /**
-     * @group legacy
-     * @expectedDeprecation The `nelmio_api_doc.routes` config option is deprecated. Please use `nelmio_api_doc.areas` instead (just replace `routes` by `areas` in your config).
-     */
-    public function testDefaultConfig()
-    {
-        $processor = new Processor();
-        $config = $processor->processConfiguration(new Configuration(), [['routes' => ['path_patterns' => ['/foo']]]]);
-
-        $this->assertSame(
-            [
-                'default' => [
-                    'path_patterns' => ['/foo'],
-                    'host_patterns' => [],
-                    'name_patterns' => [],
-                    'with_annotation' => false,
-                    'documentation' => [],
-                ],
-            ],
-            $config['areas']
-        );
-    }
 }