diff --git a/README.md b/README.md
index 6478109..58df691 100644
--- a/README.md
+++ b/README.md
@@ -11,7 +11,7 @@ Documentation is available at: https://docs.dotkernel.org/dot-router/.
 ## Badges
 
 ![OSS Lifecycle](https://img.shields.io/osslifecycle/dotkernel/dot-router)
-![PHP from Packagist (specify version)](https://img.shields.io/packagist/php-v/dotkernel/dot-router/1.0.2)
+![PHP from Packagist (specify version)](https://img.shields.io/packagist/php-v/dotkernel/dot-router/1.0.3)
 
 [![GitHub issues](https://img.shields.io/github/issues/dotkernel/dot-router)](https://github.com/dotkernel/dot-router/issues)
 [![GitHub forks](https://img.shields.io/github/forks/dotkernel/dot-router)](https://github.com/dotkernel/dot-router/network)
diff --git a/src/RouteCollectorInterface.php b/src/RouteCollectorInterface.php
index 3df2e3d..e863f11 100644
--- a/src/RouteCollectorInterface.php
+++ b/src/RouteCollectorInterface.php
@@ -12,7 +12,7 @@ interface RouteCollectorInterface
 {
     public function group(
         string $prefix,
-        string|array|callable|MiddlewareInterface|RequestHandlerInterface $middleware,
+        null|string|array|callable|MiddlewareInterface|RequestHandlerInterface $middleware = null,
     ): RouteGroupCollectorInterface;
 
     public function route(