nix-super/src/nix/upgrade-nix.md

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Examples

• 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
  

Description

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).

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