diff --git a/DependencyInjection/Configuration.php b/DependencyInjection/Configuration.php
index ae2fc06..faa8c70 100644
--- a/DependencyInjection/Configuration.php
+++ b/DependencyInjection/Configuration.php
@@ -14,7 +14,7 @@ namespace EXSyst\Bundle\ApiDocBundle\DependencyInjection;
 use Symfony\Component\Config\Definition\Builder\TreeBuilder;
 use Symfony\Component\Config\Definition\ConfigurationInterface;
 
-class Configuration implements ConfigurationInterface
+final class Configuration implements ConfigurationInterface
 {
     public function getConfigTreeBuilder()
     {
diff --git a/DependencyInjection/EXSystApiDocExtension.php b/DependencyInjection/EXSystApiDocExtension.php
index 22f4eb4..843d6be 100644
--- a/DependencyInjection/EXSystApiDocExtension.php
+++ b/DependencyInjection/EXSystApiDocExtension.php
@@ -20,7 +20,7 @@ use Symfony\Component\DependencyInjection\ContainerBuilder;
 use Symfony\Component\DependencyInjection\Loader\XmlFileLoader;
 use Symfony\Component\HttpKernel\DependencyInjection\Extension;
 
-class EXSystApiDocExtension extends Extension
+final class EXSystApiDocExtension extends Extension
 {
     /**
      * {@inheritdoc}
diff --git a/Describer/ApiPlatformDescriber.php b/Describer/ApiPlatformDescriber.php
index 2dd12c0..ef8aed2 100644
--- a/Describer/ApiPlatformDescriber.php
+++ b/Describer/ApiPlatformDescriber.php
@@ -14,7 +14,7 @@ namespace EXSyst\Bundle\ApiDocBundle\Describer;
 use ApiPlatform\Core\Documentation\Documentation;
 use ApiPlatform\Core\Swagger\Serializer\DocumentationNormalizer;
 
-class ApiPlatformDescriber extends ExternalDocDescriber
+final class ApiPlatformDescriber extends ExternalDocDescriber
 {
     public function __construct(Documentation $documentation, DocumentationNormalizer $normalizer, bool $overwrite = false)
     {
diff --git a/Describer/DefaultDescriber.php b/Describer/DefaultDescriber.php
index 3afcd0b..9e4e6b3 100644
--- a/Describer/DefaultDescriber.php
+++ b/Describer/DefaultDescriber.php
@@ -18,7 +18,7 @@ use EXSyst\Component\Swagger\Swagger;
  *
  * @author Ener-Getick <egetick@gmail.com>
  */
-class DefaultDescriber implements DescriberInterface
+final class DefaultDescriber implements DescriberInterface
 {
     public function describe(Swagger $api)
     {
diff --git a/Describer/RouteDescriber.php b/Describer/RouteDescriber.php
index f0f5e8a..775dd7a 100644
--- a/Describer/RouteDescriber.php
+++ b/Describer/RouteDescriber.php
@@ -19,7 +19,7 @@ use Symfony\Component\DependencyInjection\ContainerInterface;
 use Symfony\Component\Routing\Route;
 use Symfony\Component\Routing\RouteCollection;
 
-class RouteDescriber implements DescriberInterface
+final class RouteDescriber implements DescriberInterface
 {
     private $container;
     private $routeCollection;
diff --git a/Describer/SwaggerPhpDescriber.php b/Describer/SwaggerPhpDescriber.php
index 8354a80..c630885 100644
--- a/Describer/SwaggerPhpDescriber.php
+++ b/Describer/SwaggerPhpDescriber.php
@@ -11,7 +11,7 @@
 
 namespace EXSyst\Bundle\ApiDocBundle\Describer;
 
-class SwaggerPhpDescriber extends ExternalDocDescriber
+final class SwaggerPhpDescriber extends ExternalDocDescriber
 {
     public function __construct(string $projectPath, bool $overwrite = false)
     {
diff --git a/EXSystApiDocBundle.php b/EXSystApiDocBundle.php
index b672f38..8acaea5 100644
--- a/EXSystApiDocBundle.php
+++ b/EXSystApiDocBundle.php
@@ -17,7 +17,7 @@ use EXSyst\Bundle\ApiDocBundle\DependencyInjection\EXSystApiDocExtension;
 use Symfony\Component\DependencyInjection\ContainerBuilder;
 use Symfony\Component\HttpKernel\Bundle\Bundle;
 
-class EXSystApiDocBundle extends Bundle
+final class EXSystApiDocBundle extends Bundle
 {
     /**
      * {@inheritdoc}
diff --git a/RouteDescriber/FosRestDescriber.php b/RouteDescriber/FosRestDescriber.php
index 7da508f..3a63252 100644
--- a/RouteDescriber/FosRestDescriber.php
+++ b/RouteDescriber/FosRestDescriber.php
@@ -19,7 +19,7 @@ use Symfony\Component\Routing\Route;
 use Symfony\Component\Validator\Constraint;
 use Symfony\Component\Validator\Constraints\Regex;
 
-class FosRestDescriber implements RouteDescriberInterface
+final class FosRestDescriber implements RouteDescriberInterface
 {
     use RouteDescriberTrait;
 
diff --git a/RouteDescriber/NelmioAnnotationDescriber.php b/RouteDescriber/NelmioAnnotationDescriber.php
index c2237bf..767ee7a 100644
--- a/RouteDescriber/NelmioAnnotationDescriber.php
+++ b/RouteDescriber/NelmioAnnotationDescriber.php
@@ -17,7 +17,7 @@ use EXSyst\Component\Swagger\Swagger;
 use Nelmio\ApiDocBundle\Annotation\ApiDoc;
 use Symfony\Component\Routing\Route;
 
-class NelmioAnnotationDescriber implements RouteDescriberInterface
+final class NelmioAnnotationDescriber implements RouteDescriberInterface
 {
     use RouteDescriberTrait;
 
diff --git a/RouteDescriber/PhpDocDescriber.php b/RouteDescriber/PhpDocDescriber.php
index 90570bd..c86749c 100644
--- a/RouteDescriber/PhpDocDescriber.php
+++ b/RouteDescriber/PhpDocDescriber.php
@@ -16,7 +16,7 @@ use phpDocumentor\Reflection\DocBlockFactory;
 use phpDocumentor\Reflection\DocBlockFactoryInterface;
 use Symfony\Component\Routing\Route;
 
-class PhpDocDescriber implements RouteDescriberInterface
+final class PhpDocDescriber implements RouteDescriberInterface
 {
     use RouteDescriberTrait;
 
diff --git a/RouteDescriber/RouteMetadataDescriber.php b/RouteDescriber/RouteMetadataDescriber.php
index 84a48f1..5d0feed 100644
--- a/RouteDescriber/RouteMetadataDescriber.php
+++ b/RouteDescriber/RouteMetadataDescriber.php
@@ -14,7 +14,7 @@ namespace EXSyst\Bundle\ApiDocBundle\RouteDescriber;
 use EXSyst\Component\Swagger\Swagger;
 use Symfony\Component\Routing\Route;
 
-class RouteMetadataDescriber implements RouteDescriberInterface
+final class RouteMetadataDescriber implements RouteDescriberInterface
 {
     use RouteDescriberTrait;