diff --git a/composer.json b/composer.json
index 2ecbd138..5f4ec534 100644
--- a/composer.json
+++ b/composer.json
@@ -4,7 +4,7 @@
     "type": "project",
     "require": {
         "php": "^7.2",
-        "symfony/console": "^4.4",
+        "symfony/console": "^4.4 || ^5.0",
         "psr/container": "^1.0"
     },
     "require-dev": {
diff --git a/src/Cli/Command/ListCommand.php b/src/Cli/Command/ListCommand.php
index 354e8494..9ee4f9ab 100644
--- a/src/Cli/Command/ListCommand.php
+++ b/src/Cli/Command/ListCommand.php
@@ -46,6 +46,8 @@ protected function execute(InputInterface $input, OutputInterface $output)
                 return [\sprintf('<info>%s</info>', $tool->name()), $tool->summary().PHP_EOL.$tool->website().PHP_EOL];
             })->toArray()
         );
+
+        return 0;
     }
 
     private function createStyle(InputInterface $input, OutputInterface $output): StyleInterface