diff --git a/.gitea/workflows/iso-builder.yml b/.gitea/workflows/iso-builder.yml
index cac5dcc..e2eb7a8 100644
--- a/.gitea/workflows/iso-builder.yml
+++ b/.gitea/workflows/iso-builder.yml
@@ -35,7 +35,7 @@ jobs:
         uses: actions/checkout@v4
 
       - name: Install Nix
-        uses: cachix/install-nix-action@v28
+        uses: cachix/install-nix-action@v27
         with:
           nix_path: nixpkgs=channel:nixos-unstable
           extra_nix_config: |