How to update nix to v2.4+?

[Cornelius-Figgle]

The README says to be using nix version 2.4, but I am on 2.13.3

Make sure you're running Nix 2.4+, and opt into the experimental flakes and nix-command features:

# Should be 2.4+
nix --version
export NIX_CONFIG="experimental-features = nix-command flakes"

How do I upgrade this? Does it matter? I added nix.settings.experimental-features = [ "nix-command" "flakes" ]; to my configuration.nix and ran sudo nixos-rebuild switch --upgrade-all, but my system still returns v2.13.3 (from nix --version)

I know this probably isn't the right place but I couldn't find any information about it online

Using NixOs v23.05, blank install from GUI ISO

[Cornelius-Figgle]

Just realised that 2.13 is a higher version than 2.4

oops