Let's take a look at the NixOS 25.05 release notes. ๐Ÿ‘€

Starting on the NixOS side of things: nixos-rebuild-ng, a full rewrite of nixos-rebuild in Python, is available for testing. You can enable it by setting system.rebuild.enableNg in your configuration (to replace the old nixos-rebuild), or by adding nixos-rebuild-ng to your environment.systemPackages (for side-by-side installation). It is expected that the next major version of NixOS (25.11) will ship with nixos-rebuild-ng by default.

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