NixOS 18.09Jellyfish
NixOS 18.09 was released on Oct 5, 2018 and reached end of life on Apr 30, 2019. It no longer receives security updates.
NixOS 18.09 support timeline
Oct 5, 2018Ended
100% elapsedEnd of life
Apr 30, 2019
NixOS 18.09 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 18.09 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 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 18.03 Impala | Apr 4, 2018 | Oct 30, 2018 |
NixOS 18.09: common questions
When does NixOS 18.09 reach end of life?
NixOS 18.09 reached end of life on Apr 30, 2019, according to endoflife.date.
Is NixOS 18.09 still supported?
No. NixOS 18.09 has reached end of life and no longer receives security updates. Upgrade to NixOS 26.05 to stay supported.
When was NixOS 18.09 released?
NixOS 18.09 was released on Oct 5, 2018.
What is the codename of NixOS 18.09?
NixOS 18.09 is codenamed “Jellyfish”.
What should I upgrade NixOS 18.09 to?
NixOS 26.05 is the next release that is still supported (until Dec 31, 2026).