diff --git a/composer.json b/composer.json
index 79442cb..757bcb2 100644
--- a/composer.json
+++ b/composer.json
@@ -18,10 +18,10 @@
         }
     ],
     "require": {
-        "illuminate/support": "^5.7|^6.0|^7.0"
+        "illuminate/support": "^5.7|^6.0|^7.0|^8.0"
     },
     "require-dev": {
-        "orchestra/testbench": "^5.0"
+        "orchestra/testbench": "^6.0"
     },
     "autoload": {
         "psr-4": {
diff --git a/src/EventDispatcherDecorator.php b/src/EventDispatcherDecorator.php
index c11c4c3..34e7b7a 100644
--- a/src/EventDispatcherDecorator.php
+++ b/src/EventDispatcherDecorator.php
@@ -18,7 +18,7 @@ public function __construct(DispatcherContract $dispatcher, ContainerContract $c
         $this->container = $container;
     }
 
-    public function listen($events, $listener)
+    public function listen($events, $listener = null)
     {
         if ($this->isActionFullyQualifiedName($listener)) {
             $listener = $listener . '@runAsListener';