diff --git a/composer.json b/composer.json
index 39dae4d0..5218d749 100644
--- a/composer.json
+++ b/composer.json
@@ -17,7 +17,7 @@
         "symfony/framework-bundle": "^4.3",
         "symfony/http-foundation": "^4.3",
         "symfony/http-kernel": "^4.3",
-        "symfony/messenger": "~4.3.0",
+        "symfony/messenger": "^4.3",
         "symfony/options-resolver": "^4.3",
         "symfony/routing": "^4.3"
     },
diff --git a/src/Cli/GenerateInvoicesCommand.php b/src/Cli/GenerateInvoicesCommand.php
index fbd3b397..0e2b8da2 100644
--- a/src/Cli/GenerateInvoicesCommand.php
+++ b/src/Cli/GenerateInvoicesCommand.php
@@ -28,7 +28,7 @@ public function __construct(
         $this->orderRepository = $orderRepository;
     }
 
-    public function execute(InputInterface $input, OutputInterface $output): void
+    public function execute(InputInterface $input, OutputInterface $output): int
     {
         /** @var array $orders */
         $orders = $this->orderRepository
@@ -40,6 +40,8 @@ public function execute(InputInterface $input, OutputInterface $output): void
         $this->massInvoicesCreator->__invoke($orders);
 
         $output->writeln('Invoices generated successfully');
+
+        return 0;
     }
 
     protected function configure(): void