NixOS 20.09Nightingale
NixOS 20.09 was released on Oct 27, 2020 and reached end of life on Jun 30, 2021. It no longer receives security updates.
NixOS 20.09 support timeline
Oct 27, 2020Ended
100% elapsedEnd of life
Jun 30, 2021
NixOS 20.09 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 20.09 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 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 18.09 Jellyfish | Oct 5, 2018 | Apr 30, 2019 |
NixOS 20.09: common questions
When does NixOS 20.09 reach end of life?
NixOS 20.09 reached end of life on Jun 30, 2021, according to endoflife.date.
Is NixOS 20.09 still supported?
No. NixOS 20.09 has reached end of life and no longer receives security updates. Upgrade to NixOS 26.05 to stay supported.
When was NixOS 20.09 released?
NixOS 20.09 was released on Oct 27, 2020.
What is the codename of NixOS 20.09?
NixOS 20.09 is codenamed “Nightingale”.
What should I upgrade NixOS 20.09 to?
NixOS 26.05 is the next release that is still supported (until Dec 31, 2026).