diff --git a/machines/lisa/default.nix b/machines/lisa/default.nix
index 7dd869b..65cab40 100644
--- a/machines/lisa/default.nix
+++ b/machines/lisa/default.nix
@@ -111,6 +111,13 @@
     };
   };
 
+  services.openssh.extraConfig = ''
+  HostCertificate /etc/ssh/ssh_host_ed25519_key-cert.pub
+  HostKey /etc/ssh/ssh_host_ed25519_key
+  TrustedUserCAKeys /etc/ssh/ssh_user_key.pub
+  MaxAuthTries 20
+  '';
+
 
   networking.firewall.allowedTCPPorts = [ 51821 ];
   networking.firewall.allowedUDPPorts = [ 51821 ];