nixos-and-flakes-book/docs/nixos-with-flakes/update-the-system.md

Update the system

With Flakes, it is also very simple to update the system. Just run the following commands in /etc/nixos:

# update flake.lock
nix flake update
# apply the updates
sudo nixos-rebuild switch

Sometimes you may encounter some error of sha256 mismatch when running nixos-rebuild switch, which may be solved by updating flake.lock through nix flake update.