<chapter xmlns="http://docbook.org/ns/docbook" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xi="http://www.w3.org/2001/XInclude" version="5.0" xml:id="ch-upgrading-nix"> <title>Upgrading Nix</title> <para> Multi-user Nix users on macOS can upgrade Nix by running: <command>sudo -i sh -c 'nix-channel --update && nix-env -iA nixpkgs.nix && launchctl remove org.nixos.nix-daemon && launchctl load /Library/LaunchDaemons/org.nixos.nix-daemon.plist'</command> </para> <para> Single-user installations of Nix should run this: <command>nix-channel --update; nix-env -iA nixpkgs.nix nixpkgs.cacert</command> </para> <para> Multi-user Nix users on Linux should run this with sudo: <command>nix-channel --update; nix-env -iA nixpkgs.nix nixpkgs.cacert; systemctl daemon-reload; systemctl restart nix-daemon</command> </para> </chapter>