diff --git a/flake.lock b/flake.lock
index 9acb519..9dd5a02 100644
--- a/flake.lock
+++ b/flake.lock
@@ -38,32 +38,32 @@
     },
     "nixpkgs": {
       "locked": {
-        "lastModified": 1694304580,
-        "narHash": "sha256-5tIpNodDpEKT8mM/F5zCzWEAnidOg8eb1/x3SRaaBLs=",
+        "lastModified": 1694618689,
+        "narHash": "sha256-UQiOf8CTokDuyQgY6NpeXDL1fkeDHyNI5rfJ+wy9rg8=",
         "owner": "nixos",
         "repo": "nixpkgs",
-        "rev": "4c8cf44c5b9481a4f093f1df3b8b7ba997a7c760",
+        "rev": "e27ca312d56522b907b998c2ff99169bf12639f2",
         "type": "github"
       },
       "original": {
         "owner": "nixos",
-        "ref": "nixos-23.05",
+        "ref": "nixos-23.05-small",
         "repo": "nixpkgs",
         "type": "github"
       }
     },
     "nixpkgs-unstable": {
       "locked": {
-        "lastModified": 1694183432,
-        "narHash": "sha256-YyPGNapgZNNj51ylQMw9lAgvxtM2ai1HZVUu3GS8Fng=",
+        "lastModified": 1694669921,
+        "narHash": "sha256-6ESpJ6FsftHV96JO/zn6je07tyV2dlLR7SdLsmkegTY=",
         "owner": "nixos",
         "repo": "nixpkgs",
-        "rev": "db9208ab987cdeeedf78ad9b4cf3c55f5ebd269b",
+        "rev": "f2ea252d23ebc9a5336bf6a61e0644921f64e67c",
         "type": "github"
       },
       "original": {
         "owner": "nixos",
-        "ref": "nixos-unstable",
+        "ref": "nixos-unstable-small",
         "repo": "nixpkgs",
         "type": "github"
       }
diff --git a/flake.nix b/flake.nix
index ad5c3b9..2c69d36 100644
--- a/flake.nix
+++ b/flake.nix
@@ -2,8 +2,11 @@
   description = "CCCHH Nix Infrastructure";
 
   inputs = {
-    nixpkgs.url = "github:nixos/nixpkgs/nixos-23.05";
-    nixpkgs-unstable.url = "github:nixos/nixpkgs/nixos-unstable";
+    # Use the NixOS small channels for nixpkgs.
+    # https://nixos.org/manual/nixos/stable/#sec-upgrading
+    # https://github.com/NixOS/nixpkgs
+    nixpkgs.url = "github:nixos/nixpkgs/nixos-23.05-small";
+    nixpkgs-unstable.url = "github:nixos/nixpkgs/nixos-unstable-small";
 
     # Add nixos-generators as an input.
     # See here: https://github.com/nix-community/nixos-generators#using-in-a-flake