# Announcement of 4.2.2 Major Bugfix Release

**URL:** <https://nemo-ocean.discourse.group/t/announcement-of-4-2-2-major-bugfix-release/605>\
**Category:** Annoucements\
**Created:** [15 December 2023 14:00 UTC](https://nemo-ocean.discourse.group/t/announcement-of-4-2-2-major-bugfix-release/605 "2023-12-15T14:00:07Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![clem](https://avatars.discourse-cdn.com/v4/letter/c/6a8cbe/32.png) [@clem](https://nemo-ocean.discourse.group/u/clem)\
**Post date:** [15 December 2023 14:00 UTC](https://nemo-ocean.discourse.group/t/announcement-of-4-2-2-major-bugfix-release/605/1 "2023-12-15T14:00:07Z")

</div>

**NEMO v4.2.2 is now available!**

NEMO version 4.2.2 is a **major bugfix release**

The Nemo System Team strongly encourage all the teams to **upgrade**. Tests done at Met-Office indicate **large impacts on sea-ice and AMOC**.  
Most differences with NEMO 4.2.1 come from the debug of ice-ocean stress explained here: [bug1](https://forge.nemo-ocean.eu/nemo/nemo/-/merge_requests/402). Other debugs imply the weekly forcings [bug2](https://forge.nemo-ocean.eu/nemo/nemo/-/merge_requests/360), grazing by mesozooplankton [bug3](https://forge.nemo-ocean.eu/nemo/nemo/-/merge_requests/346), OBS operator [bug4](https://forge.nemo-ocean.eu/nemo/nemo/-/merge_requests/342), and makenemo improvements [bug5](https://forge.nemo-ocean.eu/nemo/nemo/-/merge_requests/344).

Additional bug fixes are listed here:  
[1](https://forge.nemo-ocean.eu/nemo/nemo/-/merge_requests/351), [2](https://forge.nemo-ocean.eu/nemo/nemo/-/merge_requests/367), [3](https://forge.nemo-ocean.eu/nemo/nemo/-/merge_requests/396), [4](https://forge.nemo-ocean.eu/nemo/nemo/-/merge_requests/398), [5](https://forge.nemo-ocean.eu/nemo/nemo/-/merge_requests/404), [6](https://forge.nemo-ocean.eu/nemo/nemo/-/merge_requests/420), [7](https://forge.nemo-ocean.eu/nemo/nemo/-/merge_requests/421)  
Full list of changes since 4.2.1 available here: [change](https://sites.nemo-ocean.io/user-guide/changes.html)

**Donwload**  
`git clone --branch 4.2.2 https://forge.nemo-ocean.eu/nemo/nemo.git nemo_4.2.2`