diff --git a/.forgejo/workflows/ci.yaml b/.forgejo/workflows/ci.yaml
index 26097f39..751a1127 100644
--- a/.forgejo/workflows/ci.yaml
+++ b/.forgejo/workflows/ci.yaml
@@ -26,3 +26,9 @@ jobs:
     steps:
       - uses: actions/checkout@v4
       - run: cd panel && nix-build -A tests
+
+  check-deployment-basic:
+    runs-on: native
+    steps:
+      - uses: actions/checkout@v4
+      - run: nix build .#checks.x86_64-linux.deployment-basic -L
diff --git a/deployment/check/basic/README.md b/deployment/check/basic/README.md
new file mode 100644
index 00000000..7b17dec5
--- /dev/null
+++ b/deployment/check/basic/README.md
@@ -0,0 +1,9 @@
+# Basic deployment test
+
+Basic deployment test with one deployer machine, one target machine, and a
+simple target application, namely cowsay. The goal is to check that basic
+functionalities are here.
+
+It is heavily inspired by a similar test in nixops4-nixos:
+
+https://github.com/nixops4/nixops4-nixos/blob/main/test/default/nixosTest.nix
diff --git a/deployment/check/basic/deployer.pub b/deployment/check/basic/deployer.pub
new file mode 100644
index 00000000..6da96ddb
--- /dev/null
+++ b/deployment/check/basic/deployer.pub
@@ -0,0 +1 @@
+## This file is just a placeholder. It is overwritten by the test.
diff --git a/deployment/check/basic/deployment.nix b/deployment/check/basic/deployment.nix
new file mode 100644
index 00000000..df40a765
--- /dev/null
+++ b/deployment/check/basic/deployment.nix
@@ -0,0 +1,32 @@
+{
+  inputs,
+  lib,
+  providers,
+  ...
+}:
+
+{
+  providers.local = inputs.nixops4.modules.nixops4Provider.local;
+
+  resources.target = {
+    type = providers.local.exec;
+    imports = [ inputs.nixops4-nixos.modules.nixops4Resource.nixos ];
+
+    ssh = {
+      host = "target";
+      hostPublicKey = builtins.readFile ./target_host_key.pub;
+    };
+
+    nixpkgs = inputs.nixpkgs;
+    nixos.module =
+      { pkgs, ... }:
+      {
+        imports = [
+          ./minimalTarget.nix
+          (lib.modules.importJSON ./target-network.json)
+        ];
+        nixpkgs.hostPlatform = "x86_64-linux";
+        environment.systemPackages = [ pkgs.cowsay ];
+      };
+  };
+}
diff --git a/deployment/check/basic/flake-part.nix b/deployment/check/basic/flake-part.nix
new file mode 100644
index 00000000..aabf4705
--- /dev/null
+++ b/deployment/check/basic/flake-part.nix
@@ -0,0 +1,21 @@
+{ inputs, ... }:
+
+{
+  nixops4Deployments.check-deployment-basic =
+    { ... }:
+    {
+      imports = [
+        ./deployment.nix
+      ];
+      _module.args.inputs = inputs;
+    };
+
+  perSystem =
+    { inputs', pkgs, ... }:
+    {
+      checks.deployment-basic = pkgs.callPackage ./nixosTest.nix {
+        nixops4-flake-in-a-bottle = inputs'.nixops4.packages.flake-in-a-bottle;
+        inherit inputs;
+      };
+    };
+}
diff --git a/deployment/check/basic/minimalTarget.nix b/deployment/check/basic/minimalTarget.nix
new file mode 100644
index 00000000..8cf22423
--- /dev/null
+++ b/deployment/check/basic/minimalTarget.nix
@@ -0,0 +1,35 @@
+{
+  lib,
+  modulesPath,
+  ...
+}:
+
+{
+  imports = [
+    (modulesPath + "/profiles/qemu-guest.nix")
+    (modulesPath + "/../lib/testing/nixos-test-base.nix")
+  ];
+
+  ## Test framework disables switching by default. That might be OK by itself,
+  ## but we also use this config for getting the dependencies in
+  ## `deployer.system.extraDependencies`.
+  system.switch.enable = true;
+
+  nix = {
+    ## Not used; save a large copy operation
+    channel.enable = false;
+    registry = lib.mkForce { };
+  };
+
+  services.openssh = {
+    enable = true;
+    settings.PermitRootLogin = "yes";
+  };
+
+  networking.firewall.allowedTCPPorts = [ 22 ];
+
+  users.users.root.openssh.authorizedKeys.keyFiles = [ ./deployer.pub ];
+
+  ## Test VMs don't have a bootloader by default.
+  boot.loader.grub.enable = false;
+}
diff --git a/deployment/check/basic/nixosTest.nix b/deployment/check/basic/nixosTest.nix
new file mode 100644
index 00000000..11e1de55
--- /dev/null
+++ b/deployment/check/basic/nixosTest.nix
@@ -0,0 +1,161 @@
+{
+  testers,
+  inputs,
+  runCommandNoCC,
+  nixops4-flake-in-a-bottle,
+  ...
+}:
+
+testers.runNixOSTest (
+  {
+    lib,
+    config,
+    hostPkgs,
+    ...
+  }:
+  let
+    vmSystem = config.node.pkgs.hostPlatform.system;
+
+    pathToRoot = ../../..;
+    pathFromRoot = "deployment/check/basic";
+    deploymentName = "check-deployment-basic";
+
+    ## TODO: sanity check the existence of (pathToRoot + "/flake.nix")
+    ## TODO: sanity check that (pathToRoot + "/${pathFromRoot}" == ./.)
+
+    ## The whole repository, with the flake at its root.
+    src = lib.fileset.toSource {
+      fileset = pathToRoot;
+      root = pathToRoot;
+    };
+
+    ## We will need to override some inputs by the empty flake, so we make one.
+    emptyFlake = runCommandNoCC "empty-flake" { } ''
+      mkdir $out
+      echo "{ outputs = { self }: {}; }" > $out/flake.nix
+    '';
+
+    targetNetworkJSON = hostPkgs.writeText "target-network.json" (
+      builtins.toJSON config.nodes.target.system.build.networkConfig
+    );
+
+  in
+  {
+    name = "deployment-basic";
+    imports = [
+      inputs.nixops4-nixos.modules.nixosTest.static
+    ];
+
+    nodes = {
+      deployer =
+        { pkgs, nodes, ... }:
+        {
+          environment.systemPackages = [
+            inputs.nixops4.packages.${vmSystem}.default
+          ];
+
+          virtualisation = {
+            ## Memory use is expected to be dominated by the NixOS evaluation,
+            ## which happens on the deployer.
+            memorySize = 4096;
+            diskSize = 10 * 1024;
+            cores = 2;
+          };
+
+          nix.settings = {
+            substituters = lib.mkForce [ ];
+            hashed-mirrors = null;
+            connect-timeout = 1;
+          };
+
+          system.extraDependencies =
+            [
+              "${inputs.flake-parts}"
+              "${inputs.flake-parts.inputs.nixpkgs-lib}"
+              "${inputs.nixops4}"
+              "${inputs.nixops4-nixos}"
+              "${inputs.nixpkgs}"
+
+              pkgs.stdenv
+              pkgs.stdenvNoCC
+
+              pkgs.cowsay
+              pkgs.cowsay.inputDerivation # NOTE: Crucial!!!
+
+              ## Some derivations will be different compared to target's initial
+              ## state, so we'll need to be able to build something similar.
+              ## Generally the derivation inputs aren't that different, so we
+              ## use the initial state of the target as a base.
+              nodes.target.system.build.toplevel.inputDerivation
+              nodes.target.system.build.etc.inputDerivation
+              nodes.target.system.path.inputDerivation
+              nodes.target.system.build.bootStage1.inputDerivation
+              nodes.target.system.build.bootStage2.inputDerivation
+            ]
+            ++ lib.concatLists (
+              lib.mapAttrsToList (
+                _k: v: if v ? source.inputDerivation then [ v.source.inputDerivation ] else [ ]
+              ) nodes.target.environment.etc
+            );
+        };
+
+      target.imports = [ ./minimalTarget.nix ];
+    };
+
+    testScript = ''
+      start_all()
+
+      target.wait_for_unit("multi-user.target")
+      deployer.wait_for_unit("multi-user.target")
+
+      with subtest("Unpacking"):
+        deployer.succeed("cp -r --no-preserve=mode ${src} work")
+
+      with subtest("Configure the network"):
+        deployer.copy_from_host("${targetNetworkJSON}", "/root/target-network.json")
+        deployer.succeed("mv /root/target-network.json work/${pathFromRoot}/target-network.json")
+
+      with subtest("Configure the deployer key"):
+        deployer.succeed("""mkdir -p ~/.ssh && ssh-keygen -t rsa -N "" -f ~/.ssh/id_rsa""")
+        deployer_key = deployer.succeed("cat ~/.ssh/id_rsa.pub").strip()
+        deployer.succeed(f"echo '{deployer_key}' > work/${pathFromRoot}/deployer.pub")
+        target.succeed(f"mkdir -p /root/.ssh && echo '{deployer_key}' >> /root/.ssh/authorized_keys")
+
+      with subtest("Configure the target host key"):
+        target_host_key = target.succeed("ssh-keyscan target | grep -v '^#' | cut -f 2- -d ' ' | head -n 1")
+        deployer.succeed(f"echo '{target_host_key}' > work/${pathFromRoot}/target_host_key.pub")
+
+      ## NOTE: This is super slow. It could probably be optimised in Nix, for
+      ## instance by allowing to grab things directly from the host's store.
+      with subtest("Override the lock"):
+        deployer.succeed("""
+          cd work
+          nix flake lock --extra-experimental-features 'flakes nix-command' \
+            --offline -v \
+            --override-input flake-parts ${inputs.flake-parts} \
+            --override-input nixops4 ${nixops4-flake-in-a-bottle} \
+            \
+            --override-input nixops4-nixos ${inputs.nixops4-nixos} \
+            --override-input nixops4-nixos/flake-parts ${inputs.nixops4-nixos.inputs.flake-parts} \
+            --override-input nixops4-nixos/flake-parts/nixpkgs-lib ${inputs.nixops4-nixos.inputs.flake-parts.inputs.nixpkgs-lib} \
+            --override-input nixops4-nixos/nixops4-nixos ${emptyFlake} \
+            --override-input nixops4-nixos/nixpkgs ${inputs.nixops4-nixos.inputs.nixpkgs} \
+            --override-input nixops4-nixos/nixops4 ${nixops4-flake-in-a-bottle} \
+            --override-input nixops4-nixos/git-hooks-nix ${emptyFlake} \
+            \
+            --override-input nixpkgs ${inputs.nixpkgs} \
+            --override-input git-hooks ${inputs.git-hooks} \
+            ;
+        """)
+
+      with subtest("Check the status before deployment"):
+        target.fail("cowsay hi 1>&2")
+
+      with subtest("Run the deployment"):
+        deployer.succeed("cd work && nixops4 apply ${deploymentName} --show-trace --no-interactive")
+
+      with subtest("Check the deployment"):
+        target.succeed("cowsay hi 1>&2")
+    '';
+  }
+)
diff --git a/deployment/check/basic/target-network.json b/deployment/check/basic/target-network.json
new file mode 100644
index 00000000..45cdf494
--- /dev/null
+++ b/deployment/check/basic/target-network.json
@@ -0,0 +1 @@
+{"comment": "This file is just a placeholder. It is overwritten by the test."}
diff --git a/deployment/check/basic/target_host_key.pub b/deployment/check/basic/target_host_key.pub
new file mode 100644
index 00000000..6da96ddb
--- /dev/null
+++ b/deployment/check/basic/target_host_key.pub
@@ -0,0 +1 @@
+## This file is just a placeholder. It is overwritten by the test.
diff --git a/deployment/flake-part.nix b/deployment/flake-part.nix
new file mode 100644
index 00000000..50030505
--- /dev/null
+++ b/deployment/flake-part.nix
@@ -0,0 +1,3 @@
+{
+  imports = [ ./check/basic/flake-part.nix ];
+}
diff --git a/flake.lock b/flake.lock
index ad891639..8ecb7bd0 100644
--- a/flake.lock
+++ b/flake.lock
@@ -38,23 +38,6 @@
         "type": "github"
       }
     },
-    "crane_2": {
-      "flake": false,
-      "locked": {
-        "lastModified": 1727316705,
-        "narHash": "sha256-/mumx8AQ5xFuCJqxCIOFCHTVlxHkMT21idpbgbm/TIE=",
-        "owner": "ipetkov",
-        "repo": "crane",
-        "rev": "5b03654ce046b5167e7b0bccbd8244cb56c16f0e",
-        "type": "github"
-      },
-      "original": {
-        "owner": "ipetkov",
-        "ref": "v0.19.0",
-        "repo": "crane",
-        "type": "github"
-      }
-    },
     "darwin": {
       "inputs": {
         "nixpkgs": [
@@ -98,6 +81,7 @@
     "dream2nix": {
       "inputs": {
         "nixpkgs": [
+          "nixops4-nixos",
           "nixops4",
           "nix-cargo-integration",
           "nixpkgs"
@@ -119,31 +103,6 @@
         "type": "github"
       }
     },
-    "dream2nix_2": {
-      "inputs": {
-        "nixpkgs": [
-          "nixops4-nixos",
-          "nixops4",
-          "nix-cargo-integration",
-          "nixpkgs"
-        ],
-        "purescript-overlay": "purescript-overlay_2",
-        "pyproject-nix": "pyproject-nix_2"
-      },
-      "locked": {
-        "lastModified": 1735160684,
-        "narHash": "sha256-n5CwhmqKxifuD4Sq4WuRP/h5LO6f23cGnSAuJemnd/4=",
-        "owner": "nix-community",
-        "repo": "dream2nix",
-        "rev": "8ce6284ff58208ed8961681276f82c2f8f978ef4",
-        "type": "github"
-      },
-      "original": {
-        "owner": "nix-community",
-        "repo": "dream2nix",
-        "type": "github"
-      }
-    },
     "flake-compat": {
       "flake": false,
       "locked": {
@@ -163,11 +122,11 @@
     "flake-compat_2": {
       "flake": false,
       "locked": {
-        "lastModified": 1733328505,
-        "narHash": "sha256-NeCCThCEP3eCl2l/+27kNNK7QrwZB1IJCrXfrbv5oqU=",
+        "lastModified": 1696426674,
+        "narHash": "sha256-kvjfFW7WAETZlt09AgDn1MrtKzP7t90Vf7vypd3OL1U=",
         "owner": "edolstra",
         "repo": "flake-compat",
-        "rev": "ff81ac966bb2cae68946d5ed5fc4994f96d0ffec",
+        "rev": "0f9255e01c2351cc7d116c072cb317785dd33b33",
         "type": "github"
       },
       "original": {
@@ -177,38 +136,6 @@
       }
     },
     "flake-compat_3": {
-      "flake": false,
-      "locked": {
-        "lastModified": 1696426674,
-        "narHash": "sha256-kvjfFW7WAETZlt09AgDn1MrtKzP7t90Vf7vypd3OL1U=",
-        "owner": "edolstra",
-        "repo": "flake-compat",
-        "rev": "0f9255e01c2351cc7d116c072cb317785dd33b33",
-        "type": "github"
-      },
-      "original": {
-        "owner": "edolstra",
-        "repo": "flake-compat",
-        "type": "github"
-      }
-    },
-    "flake-compat_4": {
-      "flake": false,
-      "locked": {
-        "lastModified": 1696426674,
-        "narHash": "sha256-kvjfFW7WAETZlt09AgDn1MrtKzP7t90Vf7vypd3OL1U=",
-        "owner": "edolstra",
-        "repo": "flake-compat",
-        "rev": "0f9255e01c2351cc7d116c072cb317785dd33b33",
-        "type": "github"
-      },
-      "original": {
-        "owner": "edolstra",
-        "repo": "flake-compat",
-        "type": "github"
-      }
-    },
-    "flake-compat_5": {
       "flake": false,
       "locked": {
         "lastModified": 1733328505,
@@ -224,7 +151,7 @@
         "type": "github"
       }
     },
-    "flake-compat_6": {
+    "flake-compat_4": {
       "flake": false,
       "locked": {
         "lastModified": 1696426674,
@@ -277,28 +204,6 @@
       }
     },
     "flake-parts_3": {
-      "inputs": {
-        "nixpkgs-lib": [
-          "nixops4",
-          "nix",
-          "nixpkgs"
-        ]
-      },
-      "locked": {
-        "lastModified": 1733312601,
-        "narHash": "sha256-4pDvzqnegAfRkPwO3wmwBhVi/Sye1mzps0zHWYnP88c=",
-        "owner": "hercules-ci",
-        "repo": "flake-parts",
-        "rev": "205b12d8b7cd4802fbcb8e8ef6a0f1408781a4f9",
-        "type": "github"
-      },
-      "original": {
-        "owner": "hercules-ci",
-        "repo": "flake-parts",
-        "type": "github"
-      }
-    },
-    "flake-parts_4": {
       "inputs": {
         "nixpkgs-lib": "nixpkgs-lib_3"
       },
@@ -316,25 +221,7 @@
         "type": "github"
       }
     },
-    "flake-parts_5": {
-      "inputs": {
-        "nixpkgs-lib": "nixpkgs-lib_4"
-      },
-      "locked": {
-        "lastModified": 1738453229,
-        "narHash": "sha256-7H9XgNiGLKN1G1CgRh0vUL4AheZSYzPm+zmZ7vxbJdo=",
-        "owner": "hercules-ci",
-        "repo": "flake-parts",
-        "rev": "32ea77a06711b758da0ad9bd6a844c5740a87abd",
-        "type": "github"
-      },
-      "original": {
-        "owner": "hercules-ci",
-        "repo": "flake-parts",
-        "type": "github"
-      }
-    },
-    "flake-parts_6": {
+    "flake-parts_4": {
       "inputs": {
         "nixpkgs-lib": [
           "nixops4-nixos",
@@ -375,24 +262,6 @@
         "type": "github"
       }
     },
-    "flake-utils_2": {
-      "inputs": {
-        "systems": "systems_3"
-      },
-      "locked": {
-        "lastModified": 1710146030,
-        "narHash": "sha256-SZ5L6eA7HJ/nmkzGG7/ISclqe6oZdOZTNoesiInkXPQ=",
-        "owner": "numtide",
-        "repo": "flake-utils",
-        "rev": "b1d9ab70662946ef0850d488da1c9019f3a9752a",
-        "type": "github"
-      },
-      "original": {
-        "owner": "numtide",
-        "repo": "flake-utils",
-        "type": "github"
-      }
-    },
     "git-hooks": {
       "inputs": {
         "flake-compat": "flake-compat",
@@ -415,44 +284,9 @@
     },
     "git-hooks-nix": {
       "inputs": {
-        "flake-compat": [
-          "nixops4",
-          "nix"
-        ],
-        "gitignore": [
-          "nixops4",
-          "nix"
-        ],
-        "nixpkgs": [
-          "nixops4",
-          "nix",
-          "nixpkgs"
-        ],
-        "nixpkgs-stable": [
-          "nixops4",
-          "nix",
-          "nixpkgs"
-        ]
-      },
-      "locked": {
-        "lastModified": 1734279981,
-        "narHash": "sha256-NdaCraHPp8iYMWzdXAt5Nv6sA3MUzlCiGiR586TCwo0=",
-        "owner": "cachix",
-        "repo": "git-hooks.nix",
-        "rev": "aa9f40c906904ebd83da78e7f328cd8aeaeae785",
-        "type": "github"
-      },
-      "original": {
-        "owner": "cachix",
-        "repo": "git-hooks.nix",
-        "type": "github"
-      }
-    },
-    "git-hooks-nix_2": {
-      "inputs": {
-        "flake-compat": "flake-compat_4",
+        "flake-compat": "flake-compat_2",
         "gitignore": "gitignore_2",
-        "nixpkgs": "nixpkgs_5"
+        "nixpkgs": "nixpkgs_4"
       },
       "locked": {
         "lastModified": 1737465171,
@@ -468,7 +302,7 @@
         "type": "github"
       }
     },
-    "git-hooks-nix_3": {
+    "git-hooks-nix_2": {
       "inputs": {
         "flake-compat": [
           "nixops4-nixos",
@@ -587,29 +421,14 @@
         "type": "github"
       }
     },
-    "mk-naked-shell_2": {
-      "flake": false,
-      "locked": {
-        "lastModified": 1681286841,
-        "narHash": "sha256-3XlJrwlR0nBiREnuogoa5i1b4+w/XPe0z8bbrJASw0g=",
-        "owner": "yusdacra",
-        "repo": "mk-naked-shell",
-        "rev": "7612f828dd6f22b7fb332cc69440e839d7ffe6bd",
-        "type": "github"
-      },
-      "original": {
-        "owner": "yusdacra",
-        "repo": "mk-naked-shell",
-        "type": "github"
-      }
-    },
     "nix": {
       "inputs": {
-        "flake-compat": "flake-compat_2",
-        "flake-parts": "flake-parts_3",
-        "git-hooks-nix": "git-hooks-nix",
+        "flake-compat": "flake-compat_3",
+        "flake-parts": "flake-parts_4",
+        "git-hooks-nix": "git-hooks-nix_2",
         "nixfmt": "nixfmt",
         "nixpkgs": [
+          "nixops4-nixos",
           "nixops4",
           "nixpkgs"
         ],
@@ -637,6 +456,7 @@
         "dream2nix": "dream2nix",
         "mk-naked-shell": "mk-naked-shell",
         "nixpkgs": [
+          "nixops4-nixos",
           "nixops4",
           "nixpkgs"
         ],
@@ -658,63 +478,6 @@
         "type": "github"
       }
     },
-    "nix-cargo-integration_2": {
-      "inputs": {
-        "crane": "crane_2",
-        "dream2nix": "dream2nix_2",
-        "mk-naked-shell": "mk-naked-shell_2",
-        "nixpkgs": [
-          "nixops4-nixos",
-          "nixops4",
-          "nixpkgs"
-        ],
-        "parts": "parts_2",
-        "rust-overlay": "rust-overlay_2",
-        "treefmt": "treefmt_2"
-      },
-      "locked": {
-        "lastModified": 1738390452,
-        "narHash": "sha256-o8kg4q1V2xV9ZlszAnizXJK2c+fbhAeLbGoTUa2u1Bw=",
-        "owner": "yusdacra",
-        "repo": "nix-cargo-integration",
-        "rev": "718d577808e3e31f445b6564d58b755294e72f42",
-        "type": "github"
-      },
-      "original": {
-        "owner": "yusdacra",
-        "repo": "nix-cargo-integration",
-        "type": "github"
-      }
-    },
-    "nix_2": {
-      "inputs": {
-        "flake-compat": "flake-compat_5",
-        "flake-parts": "flake-parts_6",
-        "git-hooks-nix": "git-hooks-nix_3",
-        "nixfmt": "nixfmt_2",
-        "nixpkgs": [
-          "nixops4-nixos",
-          "nixops4",
-          "nixpkgs"
-        ],
-        "nixpkgs-23-11": "nixpkgs-23-11_2",
-        "nixpkgs-regression": "nixpkgs-regression_2"
-      },
-      "locked": {
-        "lastModified": 1738382221,
-        "narHash": "sha256-3+qJBts5RTAtjCExo6bkqrttL+skpYZzPOVEzPSwVtc=",
-        "owner": "NixOS",
-        "repo": "nix",
-        "rev": "d949c8de7c7e84bb7537dc772609686c37033a3b",
-        "type": "github"
-      },
-      "original": {
-        "owner": "NixOS",
-        "ref": "master",
-        "repo": "nix",
-        "type": "github"
-      }
-    },
     "nixfmt": {
       "inputs": {
         "flake-utils": "flake-utils"
@@ -733,30 +496,12 @@
         "type": "github"
       }
     },
-    "nixfmt_2": {
-      "inputs": {
-        "flake-utils": "flake-utils_2"
-      },
-      "locked": {
-        "lastModified": 1736283758,
-        "narHash": "sha256-hrKhUp2V2fk/dvzTTHFqvtOg000G1e+jyIam+D4XqhA=",
-        "owner": "NixOS",
-        "repo": "nixfmt",
-        "rev": "8d4bd690c247004d90d8554f0b746b1231fe2436",
-        "type": "github"
-      },
-      "original": {
-        "owner": "NixOS",
-        "repo": "nixfmt",
-        "type": "github"
-      }
-    },
     "nixops4": {
       "inputs": {
-        "flake-parts": "flake-parts_2",
+        "flake-parts": "flake-parts_3",
         "nix": "nix",
         "nix-cargo-integration": "nix-cargo-integration",
-        "nixpkgs": "nixpkgs_4",
+        "nixpkgs": "nixpkgs_5",
         "nixpkgs-old": "nixpkgs-old"
       },
       "locked": {
@@ -775,9 +520,9 @@
     },
     "nixops4-nixos": {
       "inputs": {
-        "flake-parts": "flake-parts_4",
-        "git-hooks-nix": "git-hooks-nix_2",
-        "nixops4": "nixops4_2",
+        "flake-parts": "flake-parts_2",
+        "git-hooks-nix": "git-hooks-nix",
+        "nixops4": "nixops4",
         "nixops4-nixos": [
           "nixops4-nixos"
         ],
@@ -801,28 +546,6 @@
         "type": "github"
       }
     },
-    "nixops4_2": {
-      "inputs": {
-        "flake-parts": "flake-parts_5",
-        "nix": "nix_2",
-        "nix-cargo-integration": "nix-cargo-integration_2",
-        "nixpkgs": "nixpkgs_6",
-        "nixpkgs-old": "nixpkgs-old_2"
-      },
-      "locked": {
-        "lastModified": 1739444468,
-        "narHash": "sha256-brg21neEI7pUnSRksOx9IE8/Kcr8OmEg4NIxL0sSy+U=",
-        "owner": "nixops4",
-        "repo": "nixops4",
-        "rev": "fb601ee79d8c9e3e7aca98dd2334ea91da3ea7e0",
-        "type": "github"
-      },
-      "original": {
-        "owner": "nixops4",
-        "repo": "nixops4",
-        "type": "github"
-      }
-    },
     "nixpkgs": {
       "locked": {
         "lastModified": 1703013332,
@@ -855,22 +578,6 @@
         "type": "github"
       }
     },
-    "nixpkgs-23-11_2": {
-      "locked": {
-        "lastModified": 1717159533,
-        "narHash": "sha256-oamiKNfr2MS6yH64rUn99mIZjc45nGJlj9eGth/3Xuw=",
-        "owner": "NixOS",
-        "repo": "nixpkgs",
-        "rev": "a62e6edd6d5e1fa0329b8653c801147986f8d446",
-        "type": "github"
-      },
-      "original": {
-        "owner": "NixOS",
-        "repo": "nixpkgs",
-        "rev": "a62e6edd6d5e1fa0329b8653c801147986f8d446",
-        "type": "github"
-      }
-    },
     "nixpkgs-lib": {
       "locked": {
         "lastModified": 1738452942,
@@ -907,18 +614,6 @@
         "url": "https://github.com/NixOS/nixpkgs/archive/072a6db25e947df2f31aab9eccd0ab75d5b2da11.tar.gz"
       }
     },
-    "nixpkgs-lib_4": {
-      "locked": {
-        "lastModified": 1738452942,
-        "narHash": "sha256-vJzFZGaCpnmo7I6i416HaBLpC+hvcURh/BQwROcGIp8=",
-        "type": "tarball",
-        "url": "https://github.com/NixOS/nixpkgs/archive/072a6db25e947df2f31aab9eccd0ab75d5b2da11.tar.gz"
-      },
-      "original": {
-        "type": "tarball",
-        "url": "https://github.com/NixOS/nixpkgs/archive/072a6db25e947df2f31aab9eccd0ab75d5b2da11.tar.gz"
-      }
-    },
     "nixpkgs-old": {
       "locked": {
         "lastModified": 1735563628,
@@ -935,22 +630,6 @@
         "type": "github"
       }
     },
-    "nixpkgs-old_2": {
-      "locked": {
-        "lastModified": 1735563628,
-        "narHash": "sha256-OnSAY7XDSx7CtDoqNh8jwVwh4xNL/2HaJxGjryLWzX8=",
-        "owner": "NixOS",
-        "repo": "nixpkgs",
-        "rev": "b134951a4c9f3c995fd7be05f3243f8ecd65d798",
-        "type": "github"
-      },
-      "original": {
-        "owner": "NixOS",
-        "ref": "nixos-24.05",
-        "repo": "nixpkgs",
-        "type": "github"
-      }
-    },
     "nixpkgs-regression": {
       "locked": {
         "lastModified": 1643052045,
@@ -967,22 +646,6 @@
         "type": "github"
       }
     },
-    "nixpkgs-regression_2": {
-      "locked": {
-        "lastModified": 1643052045,
-        "narHash": "sha256-uGJ0VXIhWKGXxkeNnq4TvV3CIOkUJ3PAoLZ3HMzNVMw=",
-        "owner": "NixOS",
-        "repo": "nixpkgs",
-        "rev": "215d4d0fd80ca5163643b03a33fde804a29cc1e2",
-        "type": "github"
-      },
-      "original": {
-        "owner": "NixOS",
-        "repo": "nixpkgs",
-        "rev": "215d4d0fd80ca5163643b03a33fde804a29cc1e2",
-        "type": "github"
-      }
-    },
     "nixpkgs_2": {
       "locked": {
         "lastModified": 1738136902,
@@ -1016,22 +679,6 @@
       }
     },
     "nixpkgs_4": {
-      "locked": {
-        "lastModified": 1738410390,
-        "narHash": "sha256-xvTo0Aw0+veek7hvEVLzErmJyQkEcRk6PSR4zsRQFEc=",
-        "owner": "NixOS",
-        "repo": "nixpkgs",
-        "rev": "3a228057f5b619feb3186e986dbe76278d707b6e",
-        "type": "github"
-      },
-      "original": {
-        "owner": "NixOS",
-        "ref": "nixos-unstable",
-        "repo": "nixpkgs",
-        "type": "github"
-      }
-    },
-    "nixpkgs_5": {
       "locked": {
         "lastModified": 1730768919,
         "narHash": "sha256-8AKquNnnSaJRXZxc5YmF/WfmxiHX6MMZZasRP6RRQkE=",
@@ -1047,7 +694,7 @@
         "type": "github"
       }
     },
-    "nixpkgs_6": {
+    "nixpkgs_5": {
       "locked": {
         "lastModified": 1738410390,
         "narHash": "sha256-xvTo0Aw0+veek7hvEVLzErmJyQkEcRk6PSR4zsRQFEc=",
@@ -1063,7 +710,7 @@
         "type": "github"
       }
     },
-    "nixpkgs_7": {
+    "nixpkgs_6": {
       "locked": {
         "lastModified": 1740463929,
         "narHash": "sha256-4Xhu/3aUdCKeLfdteEHMegx5ooKQvwPHNkOgNCXQrvc=",
@@ -1080,28 +727,6 @@
       }
     },
     "parts": {
-      "inputs": {
-        "nixpkgs-lib": [
-          "nixops4",
-          "nix-cargo-integration",
-          "nixpkgs"
-        ]
-      },
-      "locked": {
-        "lastModified": 1736143030,
-        "narHash": "sha256-+hu54pAoLDEZT9pjHlqL9DNzWz0NbUn8NEAHP7PQPzU=",
-        "owner": "hercules-ci",
-        "repo": "flake-parts",
-        "rev": "b905f6fc23a9051a6e1b741e1438dbfc0634c6de",
-        "type": "github"
-      },
-      "original": {
-        "owner": "hercules-ci",
-        "repo": "flake-parts",
-        "type": "github"
-      }
-    },
-    "parts_2": {
       "inputs": {
         "nixpkgs-lib": [
           "nixops4-nixos",
@@ -1126,32 +751,7 @@
     },
     "purescript-overlay": {
       "inputs": {
-        "flake-compat": "flake-compat_3",
-        "nixpkgs": [
-          "nixops4",
-          "nix-cargo-integration",
-          "dream2nix",
-          "nixpkgs"
-        ],
-        "slimlock": "slimlock"
-      },
-      "locked": {
-        "lastModified": 1728546539,
-        "narHash": "sha256-Sws7w0tlnjD+Bjck1nv29NjC5DbL6nH5auL9Ex9Iz2A=",
-        "owner": "thomashoneyman",
-        "repo": "purescript-overlay",
-        "rev": "4ad4c15d07bd899d7346b331f377606631eb0ee4",
-        "type": "github"
-      },
-      "original": {
-        "owner": "thomashoneyman",
-        "repo": "purescript-overlay",
-        "type": "github"
-      }
-    },
-    "purescript-overlay_2": {
-      "inputs": {
-        "flake-compat": "flake-compat_6",
+        "flake-compat": "flake-compat_4",
         "nixpkgs": [
           "nixops4-nixos",
           "nixops4",
@@ -1159,7 +759,7 @@
           "dream2nix",
           "nixpkgs"
         ],
-        "slimlock": "slimlock_2"
+        "slimlock": "slimlock"
       },
       "locked": {
         "lastModified": 1728546539,
@@ -1192,57 +792,21 @@
         "type": "github"
       }
     },
-    "pyproject-nix_2": {
-      "flake": false,
-      "locked": {
-        "lastModified": 1702448246,
-        "narHash": "sha256-hFg5s/hoJFv7tDpiGvEvXP0UfFvFEDgTdyHIjDVHu1I=",
-        "owner": "davhau",
-        "repo": "pyproject.nix",
-        "rev": "5a06a2697b228c04dd2f35659b4b659ca74f7aeb",
-        "type": "github"
-      },
-      "original": {
-        "owner": "davhau",
-        "ref": "dream2nix",
-        "repo": "pyproject.nix",
-        "type": "github"
-      }
-    },
     "root": {
       "inputs": {
         "agenix": "agenix",
         "disko": "disko",
         "flake-parts": "flake-parts",
         "git-hooks": "git-hooks",
-        "nixops4": "nixops4",
+        "nixops4": [
+          "nixops4-nixos",
+          "nixops4"
+        ],
         "nixops4-nixos": "nixops4-nixos",
-        "nixpkgs": "nixpkgs_7"
+        "nixpkgs": "nixpkgs_6"
       }
     },
     "rust-overlay": {
-      "inputs": {
-        "nixpkgs": [
-          "nixops4",
-          "nix-cargo-integration",
-          "nixpkgs"
-        ]
-      },
-      "locked": {
-        "lastModified": 1738376888,
-        "narHash": "sha256-S6ErHxkSm0iA7ZMsjjDaASWxbELYcdfv8BhOkkj1rHw=",
-        "owner": "oxalica",
-        "repo": "rust-overlay",
-        "rev": "83284068670d5ae4a43641c4afb150f3446be70d",
-        "type": "github"
-      },
-      "original": {
-        "owner": "oxalica",
-        "repo": "rust-overlay",
-        "type": "github"
-      }
-    },
-    "rust-overlay_2": {
       "inputs": {
         "nixpkgs": [
           "nixops4-nixos",
@@ -1266,30 +830,6 @@
       }
     },
     "slimlock": {
-      "inputs": {
-        "nixpkgs": [
-          "nixops4",
-          "nix-cargo-integration",
-          "dream2nix",
-          "purescript-overlay",
-          "nixpkgs"
-        ]
-      },
-      "locked": {
-        "lastModified": 1688756706,
-        "narHash": "sha256-xzkkMv3neJJJ89zo3o2ojp7nFeaZc2G0fYwNXNJRFlo=",
-        "owner": "thomashoneyman",
-        "repo": "slimlock",
-        "rev": "cf72723f59e2340d24881fd7bf61cb113b4c407c",
-        "type": "github"
-      },
-      "original": {
-        "owner": "thomashoneyman",
-        "repo": "slimlock",
-        "type": "github"
-      }
-    },
-    "slimlock_2": {
       "inputs": {
         "nixpkgs": [
           "nixops4-nixos",
@@ -1344,44 +884,7 @@
         "type": "github"
       }
     },
-    "systems_3": {
-      "locked": {
-        "lastModified": 1681028828,
-        "narHash": "sha256-Vy1rq5AaRuLzOxct8nz4T6wlgyUR7zLU309k9mBC768=",
-        "owner": "nix-systems",
-        "repo": "default",
-        "rev": "da67096a3b9bf56a91d16901293e51ba5b49a27e",
-        "type": "github"
-      },
-      "original": {
-        "owner": "nix-systems",
-        "repo": "default",
-        "type": "github"
-      }
-    },
     "treefmt": {
-      "inputs": {
-        "nixpkgs": [
-          "nixops4",
-          "nix-cargo-integration",
-          "nixpkgs"
-        ]
-      },
-      "locked": {
-        "lastModified": 1738070913,
-        "narHash": "sha256-j6jC12vCFsTGDmY2u1H12lMr62fnclNjuCtAdF1a4Nk=",
-        "owner": "numtide",
-        "repo": "treefmt-nix",
-        "rev": "bebf27d00f7d10ba75332a0541ac43676985dea3",
-        "type": "github"
-      },
-      "original": {
-        "owner": "numtide",
-        "repo": "treefmt-nix",
-        "type": "github"
-      }
-    },
-    "treefmt_2": {
       "inputs": {
         "nixpkgs": [
           "nixops4-nixos",
diff --git a/flake.nix b/flake.nix
index 9e0a719b..217b6108 100644
--- a/flake.nix
+++ b/flake.nix
@@ -7,7 +7,7 @@
 
     disko.url = "github:nix-community/disko";
 
-    nixops4.url = "github:nixops4/nixops4";
+    nixops4.follows = "nixops4-nixos/nixops4";
     nixops4-nixos.url = "github:nixops4/nixops4-nixos";
   };
 
@@ -25,6 +25,7 @@
         inputs.git-hooks.flakeModule
         inputs.nixops4.modules.flake.default
 
+        ./deployment/flake-part.nix
         ./infra/flake-part.nix
         ./services/flake-part.nix
       ];