diff --git a/config/profiles/builder.nix b/config/profiles/builder.nix
index b4da590..4f6e989 100644
--- a/config/profiles/builder.nix
+++ b/config/profiles/builder.nix
@@ -2,7 +2,7 @@
   kyouma.deployment.auto-upgrade.cache = "daemon";
   nix.gc.options = lib.mkForce "--delete-older-than 60d";
   nix.settings = {
-    trusted-users = [ "build" ];
+    trusted-users = [ "nix-ssh" ];
     #system-features = [ "nixos-test" "benchmark" "big-parallel" "kvm" ] ++ lib.optionals pkgs.hostPlatform.isx86_64 [ "gccarch-x86-64-v3" ];
   };
   nix.extraOptions = ''
@@ -11,11 +11,10 @@
     max-substitution-jobs = 20
     max-silent-time = 14400
   '';
-  users.users.build = {
-    isNormalUser = true;
-    shell = pkgs.bash;
-    ignoreShellProgramCheck = true;
-    openssh.authorizedKeys.keys = [
+  nix.sshServe = {
+    enable = true;
+    write = true;
+    keys = [
       "ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIA/+iN407+HsfHbbC3tfdA8Yf4TZ08qXQMb4tb/SDAs+ emily@card"
       "ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIE/vCXM3IaxJP9v2Y+xcQrQD2IcffgdzqtWhpMjj9Xl5 hydra@seras"
       "ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAICT0dGyLUjxFnvqUmex+5xUGQ7D4yGHKo267JgApcq0k root@ryuuko"
diff --git a/config/services/hydra/nix-config.nix b/config/services/hydra/nix-config.nix
index 32a8333..73e47de 100644
--- a/config/services/hydra/nix-config.nix
+++ b/config/services/hydra/nix-config.nix
@@ -10,7 +10,7 @@
     }
     {
       hostName = "integra.kyouma.net";
-      sshUser = "build";
+      sshUser = "nix-ssh";
       maxJobs = 2;
       speedFactor = 4;
       systems = [ "aarch64-linux" ];
@@ -43,9 +43,6 @@
       "https://"
     ];
   };
-  users.users.hydra-queue-runner.openssh.authorizedKeys.keys = [
-      "ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIE/vCXM3IaxJP9v2Y+xcQrQD2IcffgdzqtWhpMjj9Xl5 hydra@seras"
-  ];
   programs.ssh = {
     knownHosts = {
       "build-worker-03.nyantec.com".publicKey = "ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIEGqTY74c5g15DSNPNM2Wdr5jAwS7BFgX1XRnhtGOnJc";
diff --git a/flake.lock b/flake.lock
index ea8981e..2692e35 100644
--- a/flake.lock
+++ b/flake.lock
@@ -925,11 +925,11 @@
     },
     "nixpkgs_4": {
       "locked": {
-        "lastModified": 1725103162,
-        "narHash": "sha256-Ym04C5+qovuQDYL/rKWSR+WESseQBbNAe5DsXNx5trY=",
+        "lastModified": 1725432240,
+        "narHash": "sha256-+yj+xgsfZaErbfYM3T+QvEE2hU7UuE+Jf0fJCJ8uPS0=",
         "owner": "nixos",
         "repo": "nixpkgs",
-        "rev": "12228ff1752d7b7624a54e9c1af4b222b3c1073b",
+        "rev": "ad416d066ca1222956472ab7d0555a6946746a80",
         "type": "github"
       },
       "original": {
@@ -956,11 +956,11 @@
         "treefmt-nix": "treefmt-nix_2"
       },
       "locked": {
-        "lastModified": 1725499492,
-        "narHash": "sha256-IjpbYl4ljZ6gffzfH/n2qYbtu7PZ1KM2LW+cVL6w1bk=",
+        "lastModified": 1725563454,
+        "narHash": "sha256-RQ9aKwXmqNHMBFOlHEUVrAFo7YHJSVn4nBgi2rcaCY4=",
         "owner": "nix-community",
         "repo": "nixvim",
-        "rev": "e48da949cf41597d43f8e3880fc1389129ad7427",
+        "rev": "84249a9dabdf930d968d248024c4d6240ee14548",
         "type": "github"
       },
       "original": {
@@ -1036,11 +1036,11 @@
         "nixpkgs-stable": "nixpkgs-stable_2"
       },
       "locked": {
-        "lastModified": 1725201042,
-        "narHash": "sha256-lj5pxOwidP0W//E7IvyhbhXrnEUW99I07+QpERnzTS4=",
+        "lastModified": 1725540166,
+        "narHash": "sha256-htc9rsTMSAY5ek+DB3tpntdD/es0eam2hJgO92bWSys=",
         "owner": "Mic92",
         "repo": "sops-nix",
-        "rev": "5db5921e40ae382d6716dce591ea23b0a39d96f7",
+        "rev": "d9d781523a1463965cd1e1333a306e70d9feff07",
         "type": "github"
       },
       "original": {