diff --git a/.forgejo/workflows/update.yml b/.forgejo/workflows/update.yml
index 82bfb9b..ce5fb22 100644
--- a/.forgejo/workflows/update.yml
+++ b/.forgejo/workflows/update.yml
@@ -6,9 +6,11 @@ on:
 jobs:
     lockfile:
         runs-on: docker
-        container.image: nixos/nix
+        container.image: ubuntu-23.10
         steps:
             - name: checkout
               uses: actions/checkout@v4
+            - name: Install Nix
+              uses: https://github.com/DeterminateSystems/nix-installer-action@main
             - name: Update flake.lock
-              run: 'nix flake update; git add flake.lock; git commit -m "flake.lock: Update"; git push'
+              run: 'nix flake update --commit-lock-file --commit-lockfile-summary "flake.lock: Update"; git push'