diff --git a/README.md b/README.md
index e4a39d7..e1c5faf 100644
--- a/README.md
+++ b/README.md
@@ -29,8 +29,14 @@ To build the remote machines, run `colmena apply`. See the [colmena documentatio
 
 ### Updating
 
-Run `nix flake update` to update evaluation-time dependencies.
+Run `npins update` to update the dependencies within the currently selected upgrade channels.
 
-Run `npins update` to update build-time dependencies.
+To upgrade to a new major version of a dependency, simply re-add it and the old version will be overwritten, e.g.:
 
-Commit changes to `flake.lock` and `npins/sources.json`.
\ No newline at end of file
+```sh
+npins add --name nixpkgs channel nixos-unstable
+```
+
+In either case, commit the changes to `npins/sources.json`.
+
+See the [npins documentation](https://github.com/andir/npins) for more details.
\ No newline at end of file
diff --git a/flake.lock b/flake.lock
index 8e6749e..5f61b87 100644
--- a/flake.lock
+++ b/flake.lock
@@ -83,11 +83,11 @@
     },
     "nixpkgs": {
       "locked": {
-        "lastModified": 1724242322,
-        "narHash": "sha256-HMpK7hNjhEk4z5SFg5UtxEio9OWFocHdaQzCfW1pE7w=",
+        "lastModified": 1723688146,
+        "narHash": "sha256-sqLwJcHYeWLOeP/XoLwAtYjr01TISlkOfz+NG82pbdg=",
         "owner": "NixOS",
         "repo": "nixpkgs",
-        "rev": "224042e9a3039291f22f4f2ded12af95a616cca0",
+        "rev": "c3d4ac725177c030b1e289015989da2ad9d56af0",
         "type": "github"
       },
       "original": {