# Nix 2.21 released
**URL:** https://discourse.nixos.org/t/nix-2-21-released/41300
**Category:** Announcements
**Created:** [March 12, 2024, 6:14am UTC](https://discourse.nixos.org/t/nix-2-21-released/41300 "2024-03-12T06:14:19Z")
**Posts on this page:** 11
**Page:** 1
### Author:  [@edolstra](https://discourse.nixos.org/u/edolstra)
#### Post date: [March 12, 2024, 6:14am UTC](https://discourse.nixos.org/t/nix-2-21-released/41300/1 "2024-03-12T06:14:20Z")
Hi,
I’m pleased to announce the availability of Nix 2.21.0. It is available from [http://releases.nixos.org/?prefix=nix/nix-2.21.0/](http://releases.nixos.org/?prefix=nix/nix-2.21.0/).
The most important changes are listed in [the release notes](https://releases.nixos.org/nix/nix-2.21.0/manual/release-notes/rl-2.21.html).
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### Author:  [@drupol](https://discourse.nixos.org/u/drupol)
#### Post date: [March 12, 2024, 6:16am UTC](https://discourse.nixos.org/t/nix-2-21-released/41300/2 "2024-03-12T06:16:56Z")
Great stuff ! Looking forward to test it!
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### Author:  [@spikespaz](https://discourse.nixos.org/u/spikespaz)
#### Post date: [March 13, 2024, 3:07am UTC](https://discourse.nixos.org/t/nix-2-21-released/41300/3 "2024-03-13T03:07:03Z")
Release notes link is 404
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### Author:  [@nh2](https://discourse.nixos.org/u/nh2)
#### Post date: [March 13, 2024, 3:45am UTC](https://discourse.nixos.org/t/nix-2-21-released/41300/4 "2024-03-13T03:45:03Z")
The release notes link is not 404ing.
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### Author:  [@Mic92](https://discourse.nixos.org/u/Mic92)
#### Post date: [March 13, 2024, 5:07am UTC](https://discourse.nixos.org/t/nix-2-21-released/41300/5 "2024-03-13T05:07:32Z")
Maybe some caching issue. I was earlier able to click the release notes but now I also see a 404. When visiting the manual I know only see the 2.20 release
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### Author:  [@bobvanderlinden](https://discourse.nixos.org/u/bobvanderlinden)
#### Post date: [March 13, 2024, 5:19am UTC](https://discourse.nixos.org/t/nix-2-21-released/41300/6 "2024-03-13T05:19:46Z")
Alternative release notes: [https://github.com/NixOS/nix/blob/bff5c94184e0eee2a093f3e04d4cec5010de81c7/doc/manual/src/release-notes/rl-2.21.md](https://github.com/NixOS/nix/blob/bff5c94184e0eee2a093f3e04d4cec5010de81c7/doc/manual/src/release-notes/rl-2.21.md)
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### Author:  [@edolstra](https://discourse.nixos.org/u/edolstra)
#### Post date: [March 13, 2024, 5:34am UTC](https://discourse.nixos.org/t/nix-2-21-released/41300/7 "2024-03-13T05:34:53Z")
For some reason it takes a long time for the homepage to update. I’ve edited the post to refer to the manual on [releases.nixos.org](http://releases.nixos.org).
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### Author:  [@alecandido](https://discourse.nixos.org/u/alecandido)
#### Post date: [March 13, 2024, 12:46pm UTC](https://discourse.nixos.org/t/nix-2-21-released/41300/8 "2024-03-13T12:46:47Z")
That’s weird, I was able to view the page also yesterday. Maybe it is local cache, or geographically-related?
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### Author:  [@nPrevail](https://discourse.nixos.org/u/nPrevail)
#### Post date: [March 20, 2024, 1:19am UTC](https://discourse.nixos.org/t/nix-2-21-released/41300/9 "2024-03-20T01:19:39Z")
I’m a casual Linux desktop user that recently started using NixOS. I’m not sure if this is the right thread to ask but, how necessary is it to update Nix?
I know how to update NixOS channels, and always update NixOS stable packages, but I haven’t thought of updating Nix.
Is it necessary to update this? Is this the correct to do it? [Upgrading Nix - Nix Reference Manual](https://nixos.org/manual/nix/stable/installation/upgrading.html)
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### Author:  [@wkral](https://discourse.nixos.org/u/wkral)
#### Post date: [March 20, 2024, 2:01am UTC](https://discourse.nixos.org/t/nix-2-21-released/41300/10 "2024-03-20T02:01:27Z")
Nix gets updated with NixOS so you don’t need to explicitly update Nix yourself. You’ll probably not be at the very latest version of Nix unless you’ve configured your system to use the `unstable` version of Nix on you system. Currently 2.18 is marked as the stable release.
Probably best to make a new thread for questions like this in the future as it will likely get more attention and be searchable for other folks who have the same question.
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### Author:  [@nPrevail](https://discourse.nixos.org/u/nPrevail)
#### Post date: [March 20, 2024, 2:11am UTC](https://discourse.nixos.org/t/nix-2-21-released/41300/11 "2024-03-20T02:11:25Z")
> [@wkral](#):
>
> Currently 2.18 is marked as the stable release.
Great! Thanks for clarifying. I’m on 2.18.
Glad to know I’m still up to date with stable releases.
Thank you!