diff --git a/flake.lock b/flake.lock
index 8ccfecd2..b4cecb87 100644
--- a/flake.lock
+++ b/flake.lock
@@ -687,6 +687,54 @@
         "type": "github"
       }
     },
+    "nixos-stable": {
+      "locked": {
+        "lastModified": 1687288566,
+        "narHash": "sha256-VckkiJ88Gzdc2cstm0z5eFcrHbvkm4VjxavHBGssvZI=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "b6c73c5fe53bb3afbf65e870541e0645e9145171",
+        "type": "github"
+      },
+      "original": {
+        "owner": "NixOS",
+        "ref": "nixos-23.05",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
+    "nixos-unstable": {
+      "locked": {
+        "lastModified": 1686960236,
+        "narHash": "sha256-AYCC9rXNLpUWzD9hm+askOfpliLEC9kwAo7ITJc4HIw=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "04af42f3b31dba0ef742d254456dc4c14eedac86",
+        "type": "github"
+      },
+      "original": {
+        "owner": "NixOS",
+        "ref": "nixos-unstable",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
+    "nixos-unstable-small": {
+      "locked": {
+        "lastModified": 1687369486,
+        "narHash": "sha256-BFXrDo7yuLamfbi53voC2TrHHTKEr/LJ0P+qSP51xkg=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "8b0f22dc5155e8a6d329520c27751dfb0f821d63",
+        "type": "github"
+      },
+      "original": {
+        "owner": "NixOS",
+        "ref": "nixos-unstable-small",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
     "nixpkgs": {
       "locked": {
         "lastModified": 1665763903,
@@ -771,22 +819,6 @@
       }
     },
     "nixpkgs-stable_2": {
-      "locked": {
-        "lastModified": 1686921029,
-        "narHash": "sha256-J1bX9plPCFhTSh6E3TWn9XSxggBh/zDD4xigyaIQBy8=",
-        "owner": "NixOS",
-        "repo": "nixpkgs",
-        "rev": "c7ff1b9b95620ce8728c0d7bd501c458e6da9e04",
-        "type": "github"
-      },
-      "original": {
-        "owner": "NixOS",
-        "ref": "nixos-23.05",
-        "repo": "nixpkgs",
-        "type": "github"
-      }
-    },
-    "nixpkgs-stable_3": {
       "locked": {
         "lastModified": 1687031877,
         "narHash": "sha256-yMFcVeI+kZ6KD2QBrFPNsvBrLq2Gt//D0baHByMrjFY=",
@@ -933,8 +965,10 @@
         "nix-colors": "nix-colors",
         "nix-ld": "nix-ld",
         "nixos-generators": "nixos-generators",
+        "nixos-stable": "nixos-stable",
+        "nixos-unstable": "nixos-unstable",
+        "nixos-unstable-small": "nixos-unstable-small",
         "nixpkgs": "nixpkgs_4",
-        "nixpkgs-stable": "nixpkgs-stable_2",
         "nur": "nur",
         "rust-overlay": "rust-overlay_2",
         "sops-nix": "sops-nix"
@@ -988,7 +1022,7 @@
         "nixpkgs": [
           "nixpkgs"
         ],
-        "nixpkgs-stable": "nixpkgs-stable_3"
+        "nixpkgs-stable": "nixpkgs-stable_2"
       },
       "locked": {
         "lastModified": 1687058111,
diff --git a/flake.nix b/flake.nix
index bc3e6746..58c57487 100644
--- a/flake.nix
+++ b/flake.nix
@@ -13,7 +13,12 @@
     # `nixpkgs-unstable` branch could be faster delivering updates, it is
     # looser when it comes to stability for the entirety of this configuration.
     nixpkgs.url = "github:NixOS/nixpkgs/nixos-unstable";
-    nixpkgs-stable.url = "github:NixOS/nixpkgs/nixos-23.05";
+
+    # Here are the nixpkgs variants used for creating the system configuration
+    # in `mkHost`.
+    nixos-stable.url = "github:NixOS/nixpkgs/nixos-23.05";
+    nixos-unstable.url = "github:NixOS/nixpkgs/nixos-unstable";
+    nixos-unstable-small.url = "github:NixOS/nixpkgs/nixos-unstable-small";
 
     # We're using these libraries for other functions.
     flake-utils.url = "github:numtide/flake-utils";
@@ -297,6 +302,7 @@
           mkHost {
             inherit extraModules extraArgs;
             system = metadata.system or defaultSystem;
+            nixpkgs-channel = metadata.nixpkgs-channel or "nixpkgs";
           })
         images;
 
diff --git a/images.toml b/images.toml
index 6498b4d7..5e54a71f 100644
--- a/images.toml
+++ b/images.toml
@@ -25,6 +25,7 @@ format = "vm"
 [bootstrap]
 system = "x86_64-linux"
 format = "install-iso"
+nixpkgs-channel = "nixos-unstable-small"
 
 [graphical-installer]
 system = "x86_64-linux"
diff --git a/lib/images.nix b/lib/images.nix
index a6140539..d2958a9c 100644
--- a/lib/images.nix
+++ b/lib/images.nix
@@ -7,8 +7,8 @@ let
 in
 {
   # A wrapper around the NixOS configuration function.
-  mkHost = { system, extraModules ? [ ], extraArgs ? { } }:
-    (lib.makeOverridable inputs.nixpkgs.lib.nixosSystem) {
+  mkHost = { system, extraModules ? [ ], extraArgs ? { }, nixpkgs-channel ? "nixpkgs" }:
+    (lib.makeOverridable inputs."${nixpkgs-channel}".lib.nixosSystem) {
       # The system of the NixOS system.
       inherit system lib;
       specialArgs = extraArgs;