Warning: This program is experimental and its interface is subject to change.


nix upgrade-nix - upgrade Nix to the stable version declared in Nixpkgs


nix upgrade-nix [option...]


  • Upgrade Nix to the stable version declared in Nixpkgs:

    # nix upgrade-nix
  • Upgrade Nix in a specific profile:

    # nix upgrade-nix -p /nix/var/nix/profiles/per-user/alice/profile


This command upgrades Nix to the stable version declared in Nixpkgs. This stable version is defined in nix-fallback-paths.nix and updated manually. It may not always be the latest tagged release.

By default, it locates the directory containing the nix binary in the $PATH environment variable. If that directory is a Nix profile, it will upgrade the nix package in that profile to the latest stable binary release.

You cannot use this command to upgrade Nix in the system profile of a NixOS system (that is, if nix is found in /run/current-system).


  • --dry-run
    Show what this command would do without doing it.

  • --nix-store-paths-url url
    The URL of the file that contains the store paths of the latest Nix release.

  • --profile / -p profile-dir
    The path to the Nix profile to upgrade.