diff --git a/config/services/hydra/nix-config.nix b/config/services/hydra/nix-config.nix
index 351d4bf..9902ecb 100644
--- a/config/services/hydra/nix-config.nix
+++ b/config/services/hydra/nix-config.nix
@@ -4,7 +4,7 @@
       hostName = "localhost";
       sshUser = "hydra-queue-runner";
       maxJobs = 40;
-      speedFactor = 40;
+      speedFactor = 30;
       systems = [ "x86_64-linux" ];
       supportedFeatures = [ "nixos-test" "benchmark" "big-parallel" "kvm" ];
       sshKey = config.sops.secrets."services/hydra/id_ed25519_hydra".path;
@@ -18,6 +18,24 @@
       supportedFeatures = [ "nixos-test" "benchmark" "big-parallel" "kvm" ];
       sshKey = config.sops.secrets."services/hydra/id_ed25519_hydra".path;
     }
+    {
+      hostName = "build-worker-03.nyantec.com";
+      sshUser = "nix-ssh";
+      maxJobs = 8;
+      speedFactor = 16;
+      systems = [ "x86_64-linux" ];
+      supportedFeatures = [ "nixos-test" "benchmark" "big-parallel" "kvm" "gccarch-x86-64-v3" ];
+      sshKey = config.sops.secrets."services/hydra/id_ed25519_hydra".path;
+    }
+    {
+      hostName = "build-worker-04.nyantec.com";
+      sshUser = "nix-ssh";
+      maxJobs = 8;
+      speedFactor = 16;
+      systems = [ "x86_64-linux" ];
+      supportedFeatures = [ "nixos-test" "benchmark" "big-parallel" "kvm" "gccarch-x86-64-v3" ];
+      sshKey = config.sops.secrets."services/hydra/id_ed25519_hydra".path;
+    }
   ];
   nix.settings = {
     allowed-uris = [
@@ -31,6 +49,8 @@
       "ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIE/vCXM3IaxJP9v2Y+xcQrQD2IcffgdzqtWhpMjj9Xl5 hydra@seras"
   ];
   programs.ssh = {
+    knownHosts."build-worker-03.nyantec.com".publicKey = "ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIEGqTY74c5g15DSNPNM2Wdr5jAwS7BFgX1XRnhtGOnJc";
+    knownHosts."build-worker-04.nyantec.com".publicKey = "ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAICOq+5I+nlAN2lJoOtoXrYEDuZ/TMPMa43pIlablYigK";
     knownHosts."integra.kyouma.net".publicKey = "ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIIBwEQiSfaDrUAwgul4mktusBPcIVxI4pLNDh9DPopVU";
     knownHosts."localhost".publicKey = "ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIPNVavo3YHVsrYwXRVISu7kDoknn+5inFGySn4azlB8P";
   };