If you’re not on NixOS, nix-env -iA nixpkgs.nix_2_6
should do the trick. On NixOS, you probably want to change nix.package to the same.
If you’re not on NixOS, nix-env -iA nixpkgs.nix_2_6
should do the trick. On NixOS, you probably want to change nix.package to the same.