diff --git a/src/Console/Application.php b/src/Console/Application.php
index 3aeaf90..c3dcc73 100644
--- a/src/Console/Application.php
+++ b/src/Console/Application.php
@@ -23,6 +23,7 @@
 use SelfUpdate\SelfUpdateCommand;
 use Symfony\Component\Console\Application as BaseApplication;
 use Symfony\Component\Console\Command\Command;
+use Symfony\Component\Console\Input\InputDefinition;
 use Symfony\Component\Console\Input\InputOption;
 use Symfony\Component\Console\Input\InputInterface;
 use Symfony\Component\Console\Output\OutputInterface;
@@ -59,7 +60,7 @@ public function __construct(Config $config)
     /**
      * {@inheritdoc}
      */
-    protected function getDefaultCommands()
+    protected function getDefaultCommands(): array
     {
         $commands = parent::getDefaultCommands();
         $commands[] = new SelfUpdateCommand(
@@ -102,7 +103,7 @@ protected function getDefaultCommands()
     /**
      * {@inheritDoc}
      */
-    protected function getDefaultInputDefinition()
+    protected function getDefaultInputDefinition(): InputDefinition
     {
         $definition = parent::getDefaultInputDefinition();
         $definition->addOption(new InputOption('--fcgi', null, InputOption::VALUE_OPTIONAL, 'If specified, used as a connection string to FastCGI server.'));