diff --git a/src/Client.php b/src/Client.php
index 5959146..4dab926 100644
--- a/src/Client.php
+++ b/src/Client.php
@@ -15,7 +15,7 @@ use RuntimeException;
 use TelegramApiServer\EventObservers\EventHandler;
 use TelegramApiServer\EventObservers\EventObserver;
 
-class Client
+final class Client
 {
     public static Client $self;
     /** @var API[] */
diff --git a/src/Config.php b/src/Config.php
index d2e4845..024c276 100644
--- a/src/Config.php
+++ b/src/Config.php
@@ -4,7 +4,7 @@
 namespace TelegramApiServer;
 
 
-class Config
+final class Config
 {
     private static ?Config $instance = null;
     private array $config;
diff --git a/src/Controllers/ApiController.php b/src/Controllers/ApiController.php
index 61814b8..34b038f 100644
--- a/src/Controllers/ApiController.php
+++ b/src/Controllers/ApiController.php
@@ -15,7 +15,7 @@ use function Amp\async;
 use function Amp\delay;
 use function Amp\Future\awaitAll;
 
-class ApiController extends AbstractApiController
+final class ApiController extends AbstractApiController
 {
 
     private ?string $session = '';
diff --git a/src/Controllers/EventsController.php b/src/Controllers/EventsController.php
index 9d35878..992b3aa 100644
--- a/src/Controllers/EventsController.php
+++ b/src/Controllers/EventsController.php
@@ -20,7 +20,7 @@ use TelegramApiServer\EventObservers\EventObserver;
 use TelegramApiServer\Logger;
 use Throwable;
 
-class EventsController implements WebsocketClientHandler, WebsocketAcceptor
+final class EventsController implements WebsocketClientHandler, WebsocketAcceptor
 {
     private const PING_INTERVAL_MS = 10_000;
     private WebsocketClientGateway $gateway;
diff --git a/src/Controllers/LogController.php b/src/Controllers/LogController.php
index 0f4bb14..1f6dbf6 100644
--- a/src/Controllers/LogController.php
+++ b/src/Controllers/LogController.php
@@ -17,7 +17,7 @@ use Revolt\EventLoop;
 use TelegramApiServer\EventObservers\LogObserver;
 use TelegramApiServer\Logger;
 
-class LogController implements WebsocketClientHandler, WebsocketAcceptor
+final class LogController implements WebsocketClientHandler, WebsocketAcceptor
 {
     private const PING_INTERVAL_MS = 10_000;
     private WebsocketClientGateway $gateway;
diff --git a/src/Controllers/SystemController.php b/src/Controllers/SystemController.php
index 1159b4c..9ea2831 100644
--- a/src/Controllers/SystemController.php
+++ b/src/Controllers/SystemController.php
@@ -5,7 +5,7 @@ namespace TelegramApiServer\Controllers;
 use Exception;
 use TelegramApiServer\Client;
 
-class SystemController extends AbstractApiController
+final class SystemController extends AbstractApiController
 {
     /**
      * Получаем параметры из uri
diff --git a/src/EventObservers/EventHandler.php b/src/EventObservers/EventHandler.php
index 9f3565a..b231d72 100644
--- a/src/EventObservers/EventHandler.php
+++ b/src/EventObservers/EventHandler.php
@@ -4,7 +4,7 @@ namespace TelegramApiServer\EventObservers;
 
 use TelegramApiServer\Files;
 
-class EventHandler extends \danog\MadelineProto\EventHandler
+final class EventHandler extends \danog\MadelineProto\EventHandler
 {
     public static array $instances = [];
     private string $sessionName;
diff --git a/src/EventObservers/EventObserver.php b/src/EventObservers/EventObserver.php
index 70a2112..174c428 100644
--- a/src/EventObservers/EventObserver.php
+++ b/src/EventObservers/EventObserver.php
@@ -9,7 +9,7 @@ use TelegramApiServer\Client;
 use TelegramApiServer\Logger;
 use Throwable;
 
-class EventObserver
+final class EventObserver
 {
     use ObserverTrait;
 
diff --git a/src/EventObservers/LogObserver.php b/src/EventObservers/LogObserver.php
index dd71990..c457deb 100644
--- a/src/EventObservers/LogObserver.php
+++ b/src/EventObservers/LogObserver.php
@@ -5,7 +5,7 @@ namespace TelegramApiServer\EventObservers;
 use TelegramApiServer\Logger;
 use Throwable;
 
-class LogObserver
+final class LogObserver
 {
     use ObserverTrait;
 
diff --git a/src/Exceptions/NoMediaException.php b/src/Exceptions/NoMediaException.php
index 2e17e87..73476ff 100644
--- a/src/Exceptions/NoMediaException.php
+++ b/src/Exceptions/NoMediaException.php
@@ -2,7 +2,7 @@
 
 namespace TelegramApiServer\Exceptions;
 
-class NoMediaException extends NoticeException
+final class NoMediaException extends NoticeException
 {
 
 }
\ No newline at end of file
diff --git a/src/Exceptions/NoticeException.php b/src/Exceptions/NoticeException.php
index 54e8d22..f488fb6 100644
--- a/src/Exceptions/NoticeException.php
+++ b/src/Exceptions/NoticeException.php
@@ -4,7 +4,7 @@ namespace TelegramApiServer\Exceptions;
 
 use Exception;
 
-class NoticeException extends Exception
+final class NoticeException extends Exception
 {
 
 }
\ No newline at end of file
diff --git a/src/Files.php b/src/Files.php
index 30cfdb4..e8a6164 100644
--- a/src/Files.php
+++ b/src/Files.php
@@ -4,7 +4,7 @@ namespace TelegramApiServer;
 
 use RuntimeException;
 
-class Files
+final class Files
 {
 
     public const SESSION_EXTENSION = '.madeline';
diff --git a/src/Logger.php b/src/Logger.php
index 3cfd1f5..7bf2951 100644
--- a/src/Logger.php
+++ b/src/Logger.php
@@ -34,7 +34,7 @@ use const PHP_EOL;
  *
  * @author Kévin Dunglas <dunglas@gmail.com>
  */
-class Logger extends AbstractLogger
+final class Logger extends AbstractLogger
 {
     private static ?Logger $instanse = null;
 
diff --git a/src/MadelineProtoExtensions/ApiExtensions.php b/src/MadelineProtoExtensions/ApiExtensions.php
index 874bf17..074b241 100644
--- a/src/MadelineProtoExtensions/ApiExtensions.php
+++ b/src/MadelineProtoExtensions/ApiExtensions.php
@@ -15,7 +15,7 @@ use TelegramApiServer\EventObservers\EventHandler;
 use TelegramApiServer\Exceptions\NoMediaException;
 use function Amp\delay;
 
-class ApiExtensions
+final class ApiExtensions
 {
 
     private MadelineProto\Api $madelineProto;
diff --git a/src/MadelineProtoExtensions/SystemApiExtensions.php b/src/MadelineProtoExtensions/SystemApiExtensions.php
index a78a223..c119003 100644
--- a/src/MadelineProtoExtensions/SystemApiExtensions.php
+++ b/src/MadelineProtoExtensions/SystemApiExtensions.php
@@ -13,7 +13,7 @@ use function Amp\async;
 use function Amp\File\deleteFile;
 use function Amp\Future\awaitAll;
 
-class SystemApiExtensions
+final class SystemApiExtensions
 {
     private Client $client;
 
diff --git a/src/Migrations/StartUpFixes.php b/src/Migrations/StartUpFixes.php
index f454f57..a443dea 100644
--- a/src/Migrations/StartUpFixes.php
+++ b/src/Migrations/StartUpFixes.php
@@ -4,7 +4,7 @@ namespace TelegramApiServer\Migrations;
 
 use danog\MadelineProto\Magic;
 
-class StartUpFixes
+final class StartUpFixes
 {
     public static function fix(): void
     {
diff --git a/src/Server/AccessLoggerMiddleware.php b/src/Server/AccessLoggerMiddleware.php
index 14eb60e..28ca0db 100644
--- a/src/Server/AccessLoggerMiddleware.php
+++ b/src/Server/AccessLoggerMiddleware.php
@@ -9,7 +9,7 @@ use Amp\Http\Server\Response;
 use Psr\Log\LoggerInterface as PsrLogger;
 use Psr\Log\LogLevel;
 
-class AccessLoggerMiddleware implements Middleware
+final class AccessLoggerMiddleware implements Middleware
 {
     public function __construct(
         private readonly PsrLogger $logger,
diff --git a/src/Server/Authorization.php b/src/Server/Authorization.php
index b4db07e..07c28d3 100644
--- a/src/Server/Authorization.php
+++ b/src/Server/Authorization.php
@@ -9,7 +9,7 @@ use Amp\Http\Server\RequestHandler;
 use Amp\Http\Server\Response;
 use TelegramApiServer\Config;
 
-class Authorization implements Middleware
+final class Authorization implements Middleware
 {
     private array $ipWhitelist;
     private int $selfIp;
diff --git a/src/Server/ErrorResponses.php b/src/Server/ErrorResponses.php
index ba5307d..1ce3b46 100644
--- a/src/Server/ErrorResponses.php
+++ b/src/Server/ErrorResponses.php
@@ -5,7 +5,7 @@ namespace TelegramApiServer\Server;
 use Amp\Http\Server\Response;
 use TelegramApiServer\Controllers\AbstractApiController;
 
-class ErrorResponses
+final class ErrorResponses
 {
     /**
      * @param int $status
diff --git a/src/Server/Router.php b/src/Server/Router.php
index 7e96fb1..82650a3 100644
--- a/src/Server/Router.php
+++ b/src/Server/Router.php
@@ -16,7 +16,7 @@ use TelegramApiServer\MadelineProtoExtensions\ApiExtensions;
 use TelegramApiServer\MadelineProtoExtensions\SystemApiExtensions;
 use function Amp\Http\Server\Middleware\stackMiddleware;
 
-class Router
+final class Router
 {
     private \Amp\Http\Server\Router $router;
     private SocketHttpServer $server;
diff --git a/src/Server/Server.php b/src/Server/Server.php
index 36eccf8..6309dd2 100644
--- a/src/Server/Server.php
+++ b/src/Server/Server.php
@@ -18,7 +18,7 @@ use function sprintf;
 use const SIGINT;
 use const SIGTERM;
 
-class Server
+final class Server
 {
     /**
      * Server constructor.