diff --git a/bert/configuration.nix b/bert/configuration.nix
index f9a6c33..c475e2a 100644
--- a/bert/configuration.nix
+++ b/bert/configuration.nix
@@ -51,6 +51,7 @@
 
   # Enable the OpenSSH daemon.
   services.openssh.enable = true;
+  services.openssh.settings.PasswordAuthentication = false;
   users.users.root.openssh.authorizedKeys.keys = [''ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIEhPyyqS3BGYor3zLbjc8hZuhem3mS8TNmvWogXcnz/b chandler@chandlerswift.com'' ];
 
   networking.firewall.allowedTCPPorts = [