diff --git a/hosts/aristotle/configuration.nix b/hosts/aristotle/configuration.nix
new file mode 100644
index 0000000..53fc7bc
--- /dev/null
+++ b/hosts/aristotle/configuration.nix
@@ -0,0 +1,44 @@
+{ config, pkgs, ... }:
+
+{
+  imports = [ # Include the results of the hardware scan.
+    ./hardware-configuration.nix
+  ];
+
+  # Use the extlinux boot loader. (NixOS wants to enable GRUB by default)
+  boot.loader.grub.enable = false;
+  # Enables the generation of /boot/extlinux/extlinux.conf
+  boot.loader.generic-extlinux-compatible.enable = true;
+
+  boot.kernelPackages = pkgs.linuxPackages_rpi4;
+  boot.loader.raspberryPi = {
+    enable = true;
+    version = 4;
+  };
+
+  # networking.hostName = "nixos"; # Define your hostname.
+  # networking.wireless.enable = true;  # Enables wireless support via wpa_supplicant.
+
+  # The global useDHCP flag is deprecated, therefore explicitly set to false here.
+  # Per-interface useDHCP will be mandatory in the future, so this generated config
+  # replicates the default behaviour.
+  networking.useDHCP = false;
+  networking.interfaces.eth0.useDHCP = true;
+  networking.interfaces.wlan0.useDHCP = true;
+
+  # Enable the OpenSSH daemon.
+  services.openssh.enable = true;
+  users.users.root.openssh.authorizedKeys.keys = [
+    "ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIJ0mE4MyMnfd1b2nlBJT7kpZ6Vov+ILuGNfzdp5ZBNQe walkah@walkah.net"
+  ];
+
+  services.tailscale.enable = true;
+
+  # This value determines the NixOS release from which the default
+  # settings for stateful data, like file locations and database versions
+  # on your system were taken. It‘s perfectly fine and recommended to leave
+  # this value at the release version of the first install of this system.
+  # Before changing this value read the documentation for this option
+  # (e.g. man configuration.nix or on https://nixos.org/nixos/options.html).
+  system.stateVersion = "21.03"; # Did you read the comment?
+}
diff --git a/hosts/aristotle/hardware-configuration.nix b/hosts/aristotle/hardware-configuration.nix
new file mode 100644
index 0000000..bb1fa45
--- /dev/null
+++ b/hosts/aristotle/hardware-configuration.nix
@@ -0,0 +1,22 @@
+# Do not modify this file!  It was generated by ‘nixos-generate-config’
+# and may be overwritten by future invocations.  Please make changes
+# to /etc/nixos/configuration.nix instead.
+{ config, lib, pkgs, modulesPath, ... }:
+
+{
+  imports = [ (modulesPath + "/installer/scan/not-detected.nix") ];
+
+  boot.initrd.availableKernelModules = [ "usbhid" ];
+  boot.initrd.kernelModules = [ ];
+  boot.kernelModules = [ ];
+  boot.extraModulePackages = [ ];
+
+  fileSystems."/" = {
+    device = "/dev/disk/by-uuid/44444444-4444-4444-8888-888888888888";
+    fsType = "ext4";
+  };
+
+  swapDevices = [ ];
+
+  powerManagement.cpuFreqGovernor = lib.mkDefault "ondemand";
+}
diff --git a/nix/sources.json b/nix/sources.json
index 09ae009..414aa01 100644
--- a/nix/sources.json
+++ b/nix/sources.json
@@ -17,10 +17,10 @@
         "homepage": "",
         "owner": "NixOS",
         "repo": "nixpkgs",
-        "rev": "5df05c902cde398e056eb6271d5fe13e418db4c6",
-        "sha256": "12plc7k251z1dmmrd29lyrpw0xmjvmf79yj568aapzrcki5mrw74",
+        "rev": "55fafd9e23aa3e674a8db89013a004512ec5d2a9",
+        "sha256": "02vy0544zvh7j6azmg35az0za55m2pyczb2361w0awriz2ckbpav",
         "type": "tarball",
-        "url": "https://github.com/NixOS/nixpkgs/archive/5df05c902cde398e056eb6271d5fe13e418db4c6.tar.gz",
+        "url": "https://github.com/NixOS/nixpkgs/archive/55fafd9e23aa3e674a8db89013a004512ec5d2a9.tar.gz",
         "url_template": "https://github.com/<owner>/<repo>/archive/<rev>.tar.gz"
     }
 }
diff --git a/ops/aristotle.nix b/ops/aristotle.nix
new file mode 100644
index 0000000..efb5167
--- /dev/null
+++ b/ops/aristotle.nix
@@ -0,0 +1,39 @@
+{
+  network = { description = "RPi 4 cluster"; };
+
+  agent = { config, pkgs, ... }: {
+    imports = [ ../hosts/aristotle/configuration.nix ];
+    networking.hostName = "agent";
+    nixpkgs.system = "aarch64-linux";
+
+    deployment.targetHost = "192.168.6.200";
+    deployment.targetUser = "root";
+  };
+
+  form = { config, pkgs, ... }: {
+    imports = [ ../hosts/aristotle/configuration.nix ];
+    networking.hostName = "form";
+    nixpkgs.system = "aarch64-linux";
+
+    deployment.targetHost = "192.168.6.201";
+    deployment.targetUser = "root";
+  };
+
+  matter = { config, pkgs, ... }: {
+    imports = [ ../hosts/aristotle/configuration.nix ];
+    networking.hostName = "matter";
+    nixpkgs.system = "aarch64-linux";
+
+    deployment.targetHost = "192.168.6.202";
+    deployment.targetUser = "root";
+  };
+
+  purpose = { config, pkgs, ... }: {
+    imports = [ ../hosts/aristotle/configuration.nix ];
+    networking.hostName = "purpose";
+    nixpkgs.system = "aarch64-linux";
+
+    deployment.targetHost = "192.168.6.203";
+    deployment.targetUser = "root";
+  };
+}
diff --git a/shell.nix b/shell.nix
index df4e0c7..d2241df 100644
--- a/shell.nix
+++ b/shell.nix
@@ -2,5 +2,5 @@
 
 pkgs.mkShell {
   name = "athens";
-  buildInputs = [ ];
+  buildInputs = [ pkgs.morph ];
 }