[taohansen]

You can upgrade right now with `nix.package = pkgs.nixUnstable;` in your `~/.nixpkgs/config.nix` [1] or on the command-line: `nix-channel --add https://nixos.org/channels/nixos-unstable nixos` followed by `nix-channel --update` if on any system but NixOS or `nixos-rebuild switch` if on NixOS.

[1] https://ebzzry.io/en/nix/#nixpkgsconfiguration

[eridius]

As I mentioned in my comment, nixpkgs.nixUnstable shows up as a 2.0 pre-release (specifically, nix-2.0pre5968_a6c0b773).