NixOS 21.05Okapi
NixOS 21.05 was released on May 31, 2021 and reached end of life on Dec 31, 2021. It no longer receives security updates.
NixOS 21.05 support timeline
May 31, 2021Ended
100% elapsedEnd of life
Dec 31, 2021
NixOS 21.05 release and support dates
| Milestone | Date | Meaning |
|---|---|---|
| Released | ||
| End of life | Security updates stop. endoflife.date’s listed end of support. |
Source: endoflife.date, fetched Oct 6, 2026. Status as of Oct 7, 2026. Support scope varies by project; confirm on the official site.
What to do now that NixOS 21.05 is end of life
Running an end-of-life release means new vulnerabilities in the kernel, browser libraries, and system packages stay unpatched. The next supported step is NixOS 26.05, supported until Dec 31, 2026.
Switch the nixos channel (or your flake’s nixpkgs input) to the new release, then run sudo nixos-rebuild switch --upgrade.
Other NixOS versions
| Version | Released | End of life |
|---|---|---|
| NixOS 23.05 Stoat | May 31, 2023 | Dec 31, 2023 |
| NixOS 22.11 Raccoon | Nov 30, 2022 | Jun 30, 2023 |
| NixOS 22.05 Quokka | May 30, 2022 | Dec 31, 2022 |
| NixOS 21.11 Porcupine | Nov 30, 2021 | Jun 30, 2022 |
| NixOS 21.05 Okapi | May 31, 2021 | Dec 31, 2021 |
| NixOS 20.09 Nightingale | Oct 27, 2020 | Jun 30, 2021 |
| NixOS 20.03 Markhor | Apr 20, 2020 | Oct 30, 2020 |
| NixOS 19.09 Loris | Oct 9, 2019 | Apr 30, 2020 |
| NixOS 19.03 Koi | Apr 11, 2019 | Oct 30, 2019 |
NixOS 21.05: common questions
When does NixOS 21.05 reach end of life?
NixOS 21.05 reached end of life on Dec 31, 2021, according to endoflife.date.
Is NixOS 21.05 still supported?
No. NixOS 21.05 has reached end of life and no longer receives security updates. Upgrade to NixOS 26.05 to stay supported.
When was NixOS 21.05 released?
NixOS 21.05 was released on May 31, 2021.
What is the codename of NixOS 21.05?
NixOS 21.05 is codenamed “Okapi”.
What should I upgrade NixOS 21.05 to?
NixOS 26.05 is the next release that is still supported (until Dec 31, 2026).