diff --git a/src/Infrastructure/Cli/Ssh.php b/src/Infrastructure/Cli/Ssh.php
index a2dfc94..e231f65 100644
--- a/src/Infrastructure/Cli/Ssh.php
+++ b/src/Infrastructure/Cli/Ssh.php
@@ -49,7 +49,7 @@ public function exec(string $command, string $username, ?string $password = null
         return $output;
     }
 
-    public function getAuthenticatedConnection(string $username, ?$password = null)
+    public function getAuthenticatedConnection(string $username, ?string $password = null)
     {
         $connection = ssh2_connect($this->host, $this->port);