diff --git a/config/profiles/builder.nix b/config/profiles/builder.nix
index 48e8861..6e4a7cd 100644
--- a/config/profiles/builder.nix
+++ b/config/profiles/builder.nix
@@ -13,6 +13,7 @@
     ignoreShellProgramCheck = true;
     openssh.authorizedKeys.keys = [
       "ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIA/+iN407+HsfHbbC3tfdA8Yf4TZ08qXQMb4tb/SDAs+ emily@card"
+      "ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIE/vCXM3IaxJP9v2Y+xcQrQD2IcffgdzqtWhpMjj9Xl5 hydra@seras"
       "ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAICT0dGyLUjxFnvqUmex+5xUGQ7D4yGHKo267JgApcq0k root@ryuuko"
       "ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIIDTwCSWYODyvTJxwB6Rahuy0j6s/YYwtQta8bjzG/We root@ryuuko-arch"
     ];
diff --git a/config/services/hydra.nix b/config/services/hydra.nix
index f584d71..cccd558 100644
--- a/config/services/hydra.nix
+++ b/config/services/hydra.nix
@@ -22,6 +22,7 @@
       speedFactor = 8;
       systems = [ "aarch64-linux" "aarch64-darwin" ];
       supportedFeatures = [ "nixos-test" "benchmark" "big-parallel" "kvm" ];
+      sshKey = "/var/lib/hydra/id_ed25519";
     }
   ];
   nix.settings.allowed-uris = [