Vim plugin not available on my system - but it is in Nixpkgs

I’m trying to add the ragtag Vim plugin, which is available in Nixpkgs (added on August 15, 2020), yet I it is unavailable on my system:

$ nix search nixpkgs.vimPlugins | grep ragtag

$ nix-env -f '<nixpkgs>' -qaP -A vimPlugins | grep ragtag

Did nix-channel --update but it didn’t help. The Home Manager issue #416 seems to be the same issue as mine, but I couldn’t grasp how to utilize the suggestions there yet…

do you mind running nix-info -m?

Thanks, I was under the impression that I have already upgraded to 20.09… Once I did, ragtag was there alright.

$ nix-info -m
 - system: `"x86_64-linux"`
 - host os: `Linux 5.4.77, NixOS, 20.03.3258.86fa45b0ff1 (Markhor)`
 - multi-user?: `yes`
 - sandbox: `yes`
 - version: `nix-env (Nix) 2.3.6`
 - channels(root): `"nixos-20.03.3325.462c6fe4b11, nixos-unstable-21.05pre272380.f6b5bfdb470"`
 - channels(toraritte): `""`
 - nixpkgs: `/nix/var/nix/profiles/per-user/root/channels/nixos`
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