diff --git a/sets/builder.nix b/sets/builder.nix
index 4393e37..5d201d8 100644
--- a/sets/builder.nix
+++ b/sets/builder.nix
@@ -9,6 +9,7 @@
     useDefaultShell = true;
     openssh.authorizedKeys.keys = [
       "ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIFOBdARV3DVx4fKTf1hCSmOz+S06pI28cvrdo+FbWDP/ root@rainbowdash"
+      "ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIElCYORRBERl/as01Obp1Og/mdy28V7gw32uCZseOSZt root@spike"
     ];
   };
 }
diff --git a/sets/ssh.nix b/sets/ssh.nix
index f4e667c..ac4e491 100644
--- a/sets/ssh.nix
+++ b/sets/ssh.nix
@@ -4,6 +4,7 @@
   services.openssh = {
     enable = true;
     passwordAuthentication = false;
+    challengeResponseAuthentication = false;
   };
   # users.users.artemis.openssh.authorizedKeys.keys set in private
 }
diff --git a/system/spike/default.nix b/system/spike/default.nix
index 1f01dc8..f78e02b 100644
--- a/system/spike/default.nix
+++ b/system/spike/default.nix
@@ -9,6 +9,7 @@
     ../../sets/hacking.nix
     ../../sets/laptop.nix
     ../../sets/ssh.nix
+    ../../sets/buildMachines.nix
     ../../sets/workstation.nix
   ];