diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index 5f65788..503da53 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -15,10 +15,6 @@ jobs:
     uses: ./.github/workflows/laravel.yml
     with:
       php-versions: '8.2,8.3,8.4,8.5'
-  call-lumen:
-    uses: ./.github/workflows/lumen.yml
-    with:
-      php-versions: '8.2,8.3,8.4,8.5'
   call-slim:
     uses: ./.github/workflows/slim.yml
     with:
diff --git a/.github/workflows/lumen.yml b/.github/workflows/lumen.yml
deleted file mode 100644
index 6b356fd..0000000
--- a/.github/workflows/lumen.yml
+++ /dev/null
@@ -1,49 +0,0 @@
-name: lumen
-
-on:
-  workflow_call:
-    inputs:
-      php-versions:
-        required: true
-        type: string
-
-jobs:
-  test:
-    runs-on: ${{ matrix.operating-system }}
-    env:
-      COMPOSER_AUTH: '{"github-oauth": {"github.com": "${{ secrets.GITHUB_TOKEN }}"}}'
-      COMPOSER_TOKEN: ${{ secrets.GITHUB_TOKEN }}
-    strategy:
-      fail-fast: true
-      matrix:
-        operating-system: [ ubuntu-latest ]
-        php: ${{ fromJson(format('[{0}]', inputs.php-versions)) }}
-        lumen: [ '10.0' ]
-        dependencies: [ 'highest' ]
-
-    name: PHP ${{ matrix.php }} / Lumen ${{ matrix.lumen }} on ${{ matrix.operating-system }} with ${{ matrix.dependencies }} dependencies
-
-    steps:
-      - uses: actions/checkout@v6
-        name: Checkout repository
-
-      - name: Setup PHP
-        uses: shivammathur/setup-php@v2
-        with:
-          php-version: ${{ matrix.php }}
-          coverage: pcov
-
-      - name: Install framework deps
-        run: |
-          composer require --dev laravel/lumen "^${{ matrix.lumen }}" -W
-
-      - name: Composer install
-        uses: ramsey/composer-install@v4
-        with:
-          dependency-versions: ${{ matrix.dependencies }}
-          composer-options: ${{ matrix.composer-options }}
-
-      - name: PHPUnit + Code coverage
-        run: |
-          mkdir -p build/logs
-          vendor/bin/phpunit --coverage-text --coverage-clover build/logs/clover.xml
diff --git a/.gitignore b/.gitignore
index 5928085..55640a2 100644
--- a/.gitignore
+++ b/.gitignore
@@ -6,3 +6,4 @@ composer.lock
 vendor/
 tests/storage/
 tests/*/openapi.yaml
+/.claude/settings.local.json
diff --git a/README.md b/README.md
index 99f8174..ea4ea4f 100644
--- a/README.md
+++ b/README.md
@@ -9,7 +9,6 @@ Allows to (re-)use [Swagger-PHP](https://github.com/zircote/swagger-php) attribu
 to configure routes in the following frameworks:
 
 * [Laravel](https://github.com/laravel/laravel)
-* [Lumen](https://github.com/laravel/lumen)
 * [Slim](https://github.com/slimphp/Slim)
 
 
diff --git a/composer.json b/composer.json
index ed30ca7..1f40b64 100644
--- a/composer.json
+++ b/composer.json
@@ -46,7 +46,7 @@
         "php": ">=8.2",
         "psr/log": "^1.1 || ^2.0 || ^3.0",
         "psr/simple-cache": "^1.0 || ^2.0 || ^3.0",
-        "radebatz/openapi-extras": "^3.0 || ^4.0",
+        "radebatz/openapi-extras": "^4.2",
         "zircote/swagger-php": "^4.11.1 || ^5.0.2 || ^6.0"
     },
     "require-dev": {
diff --git a/src/Adapters/LaravelRoutingAdapter.php b/src/Adapters/LaravelRoutingAdapter.php
index 5e8901b..93b220d 100644
--- a/src/Adapters/LaravelRoutingAdapter.php
+++ b/src/Adapters/LaravelRoutingAdapter.php
@@ -21,7 +21,6 @@ public function __construct(Application $app, array $options = [])
         $this->app = $app;
         $this->options = array_merge([
                 static::OPTION_AUTO_REGEX => true,
-                static::OPTION_NAMESPACE => 'App\\Http\\Controllers\\',
             ], $options);
     }
 
@@ -55,9 +54,6 @@ public function register(Operation $operation, string $controller, array $parame
         }
 
         $controller = str_replace('::__invoke', '', $controller);
-        if ($namespace = $this->options[static::OPTION_NAMESPACE]) {
-            $controller = str_replace($namespace, '', $controller);
-        }
 
         /** @var Router $router */
         $router = $this->app->get('router');
diff --git a/src/Adapters/LumenRoutingAdapter.php b/src/Adapters/LumenRoutingAdapter.php
deleted file mode 100644
index 06b79c9..0000000
--- a/src/Adapters/LumenRoutingAdapter.php
+++ /dev/null
@@ -1,85 +0,0 @@
-<?php declare(strict_types=1);
-
-namespace Radebatz\OpenApi\Routing\Adapters;
-
-use Laravel\Lumen\Application;
-use Laravel\Lumen\Routing\Router;
-use OpenApi\Annotations\Operation;
-use OpenApi\Annotations\Parameter;
-use Radebatz\OpenApi\Routing\RoutingAdapterInterface;
-
-/**
- * Lumen routing adapter.
- */
-class LumenRoutingAdapter implements RoutingAdapterInterface
-{
-    protected Application $app;
-    protected array $options;
-
-    public function __construct(Application $app, array $options = [])
-    {
-        $this->app = $app;
-        $this->options = array_merge([
-            static::OPTION_AUTO_REGEX => true,
-            static::OPTION_NAMESPACE => 'App\\Http\\Controllers\\',
-        ], $options);
-    }
-
-    /**
-     * @inheritdoc
-     */
-    public function register(Operation $operation, string $controller, array $parameters, array $custom): void
-    {
-        $path = $operation->path;
-        $controller = str_replace('::__invoke', '', $controller);
-        if ($namespace = $this->options[self::OPTION_NAMESPACE]) {
-            $controller = str_replace($namespace, '', $controller);
-        }
-
-        /** @var Parameter $parameter */
-        foreach ($parameters as $name => $parameter) {
-            if (!$parameter['required']) {
-                if (false !== strpos($path, $needle = "/{{$name}}[/{")) {
-                    // multiple optional parameters
-                    $path = preg_replace("#/{{$name}}(\[?.*}\])#", "[/{{$name}}$1]", $path);
-                } else {
-                    $path = str_replace("/{{$name}}", "[/{{$name}}]", $path);
-                }
-            }
-
-            switch ($parameter['type']) {
-                case 'regex':
-                    if ($pattern = $parameter['pattern']) {
-                        $path = str_replace("{{$name}}", "{{$name}:$pattern}", $path);
-                    }
-                    break;
-
-                case 'integer':
-                    if ($this->options[self::OPTION_AUTO_REGEX]) {
-                        $path = str_replace("{{$name}}", "{{$name}:[0-9]+}", $path);
-                    }
-                    break;
-            }
-        }
-
-        /** @var Router $router */
-        $router = $this->app->router;
-
-        $action = [
-            'uses' => str_replace('::', '@', $controller),
-        ];
-        if ($custom[static::X_NAME]) {
-            $action['as'] = $custom[static::X_NAME];
-        }
-
-        $router->addRoute(strtoupper($operation->method), $path, $action);
-    }
-
-    /**
-     * @inheritdoc
-     */
-    public function registerCached(): bool
-    {
-        return false;
-    }
-}
diff --git a/src/RoutingAdapterInterface.php b/src/RoutingAdapterInterface.php
index 978ca36..b98a8e7 100644
--- a/src/RoutingAdapterInterface.php
+++ b/src/RoutingAdapterInterface.php
@@ -13,7 +13,6 @@ interface RoutingAdapterInterface
     public const X_NAME = 'name';
     public const X_MIDDLEWARE = 'middleware';
 
-    public const OPTION_NAMESPACE = 'namespace';
     public const OPTION_AUTO_REGEX = 'autoregex';
 
     /**
diff --git a/tests/Laravel/LaravelTest.php b/tests/Laravel/LaravelTest.php
index 0913184..e2901bf 100644
--- a/tests/Laravel/LaravelTest.php
+++ b/tests/Laravel/LaravelTest.php
@@ -56,6 +56,6 @@ public function attributesMiddleware()
         $route = $this->getRouter()->getRoutes()->getByName('attributes');
 
         $this->assertNotNull($route);
-        $this->assertEquals([BarMiddleware::class, FooMiddleware::class], $route->gatherMiddleware());
+        $this->assertSame([FooMiddleware::class, BarMiddleware::class], $route->gatherMiddleware());
     }
 }
diff --git a/tests/Lumen/CallsApplicationTrait.php b/tests/Lumen/CallsApplicationTrait.php
deleted file mode 100644
index 6158ae8..0000000
--- a/tests/Lumen/CallsApplicationTrait.php
+++ /dev/null
@@ -1,58 +0,0 @@
-<?php declare(strict_types=1);
-
-namespace Radebatz\OpenApi\Routing\Tests\Lumen;
-
-use Laravel\Lumen\Application;
-use Laravel\Lumen\Routing\Router;
-use Radebatz\OpenApi\Routing\Adapters\LumenRoutingAdapter;
-use Radebatz\OpenApi\Routing\OpenApiRouter;
-use Radebatz\OpenApi\Routing\Tests\Concerns\Fixtures;
-use function app;
-
-trait CallsApplicationTrait
-{
-    use Fixtures;
-
-    protected function setUp(): void
-    {
-        if (!class_exists('\\Laravel\\Lumen\\Application')) {
-            $this->markTestSkipped('not installed.');
-        }
-        parent::setUp();
-    }
-
-    /** @inheritdoc */
-    public function createApplication()
-    {
-        $app = new Application();
-        app('config')->set([
-            'app.environment' => 'local',
-            'app.debug' => true,
-        ]);
-
-        $options = [
-            OpenApiRouter::OPTION_OA_INFO_INJECT => true,
-            OpenApiRouter::OPTION_OA_OPERATION_ID_AS_NAME => true,
-        ];
-
-        (new OpenApiRouter($this->getFixtureFinder(), new LumenRoutingAdapter($app), $options))
-            ->registerRoutes();
-        $openapi = (new OpenApiRouter($this->getFixtureFinder(), new LumenRoutingAdapter($app), $options))
-            ->scan();
-        file_put_contents(__DIR__ . '/openapi.yaml', $openapi->toYaml());
-
-        return $app;
-    }
-
-    protected function getRouter(?Application $app = null): Router
-    {
-        $app = $app ?: $this->app;
-
-        return $app->router;
-    }
-
-    public function route($name, $parameters = [], $secure = null)
-    {
-        return $this->app['url']->route($name, $parameters, $secure);
-    }
-}
diff --git a/tests/Lumen/LumenTest.php b/tests/Lumen/LumenTest.php
deleted file mode 100644
index 0f32731..0000000
--- a/tests/Lumen/LumenTest.php
+++ /dev/null
@@ -1,51 +0,0 @@
-<?php declare(strict_types=1);
-
-namespace Radebatz\OpenApi\Routing\Tests\Lumen;
-
-class LumenTest extends LumenTestCase
-{
-    public $response;
-
-    use CallsApplicationTrait;
-
-    /** @test */
-    public function namedRoute()
-    {
-        $this->assertTrue(array_key_exists('invoke', $this->getRouter()->namedRoutes));
-    }
-
-    /** @test */
-    public function invoke()
-    {
-        $this->get('/foo/invoke/joe');
-        $this->assertEquals(200, $this->response->getStatusCode());
-    }
-
-    /** @test */
-    public function prefixed()
-    {
-        $this->get($this->route('prefixed'));
-        $this->assertEquals(200, $this->response->getStatusCode());
-
-        $this->get('foo/prefixed');
-        $this->assertEquals(200, $this->response->getStatusCode());
-    }
-
-    /** @test */
-    public function middleware()
-    {
-        $this->get($this->route('mw'));
-        $this->assertEquals(200, $this->response->getStatusCode());
-    }
-
-    /**
-     * @test
-     *
-     * @requires PHP 8.1
-     */
-    public function attributesPrefixed()
-    {
-        $this->get('attributes/prefixed');
-        $this->assertEquals(200, $this->response->getStatusCode());
-    }
-}
diff --git a/tests/Lumen/LumenTestCase.php b/tests/Lumen/LumenTestCase.php
deleted file mode 100644
index 64a596f..0000000
--- a/tests/Lumen/LumenTestCase.php
+++ /dev/null
@@ -1,13 +0,0 @@
-<?php declare(strict_types=1);
-
-namespace Radebatz\OpenApi\Routing\Tests\Lumen;
-
-if (class_exists('\\Laravel\\Lumen\\Testing\\TestCase')) {
-    abstract class LumenTestCase extends \Laravel\Lumen\Testing\TestCase
-    {
-    }
-} else {
-    class LumenTestCase extends \PHPUnit\Framework\TestCase
-    {
-    }
-}
diff --git a/tests/Lumen/ParametersTest.php b/tests/Lumen/ParametersTest.php
deleted file mode 100644
index c1ea2b3..0000000
--- a/tests/Lumen/ParametersTest.php
+++ /dev/null
@@ -1,58 +0,0 @@
-<?php declare(strict_types=1);
-
-namespace Radebatz\OpenApi\Routing\Tests\Lumen;
-
-class ParametersTest extends LumenTestCase
-{
-    public $response;
-    use CallsApplicationTrait;
-
-    /** @test */
-    public function parameter()
-    {
-        $this->get($this->route('hey', ['name' => 'joe']));
-        $this->assertEquals(200, $this->response->getStatusCode());
-    }
-
-    /** @test */
-    public function optionalParameter()
-    {
-        $this->get($this->route('oi', ['name' => 'joe']));
-        $this->assertEquals(200, $this->response->getStatusCode());
-        $this->assertEquals('Oi: joe', $this->response->getContent());
-
-        $this->get($this->route('oi'));
-        $this->assertEquals(200, $this->response->getStatusCode());
-        $this->assertEquals('Oi: you', $this->response->getContent());
-    }
-
-    /** @test */
-    public function typedParameterMatch()
-    {
-        $this->get($this->route('id', ['id' => '123']));
-        $this->assertEquals(200, $this->response->getStatusCode());
-        $this->assertEquals('ID: 123', $this->response->getContent());
-    }
-
-    /** @test */
-    public function typedParameterFail()
-    {
-        $this->get($this->route('id', ['id' => 'x123']));
-        $this->assertEquals(404, $this->response->getStatusCode());
-    }
-
-    /** @test */
-    public function regexParameterMatch()
-    {
-        $this->get($this->route('hid', ['hid' => 'a1b2c3']));
-        $this->assertEquals(200, $this->response->getStatusCode());
-        $this->assertEquals('HID: a1b2c3', $this->response->getContent());
-    }
-
-    /** @test */
-    public function regexParameterFail()
-    {
-        $this->get($this->route('hid', ['hid' => 'za1b2c3']));
-        $this->assertEquals(404, $this->response->getStatusCode());
-    }
-}