# Cylc 8 with LFRic Rose stems and Jinja2 issues

**URL:** <https://cylc.discourse.group/t/cylc-8-with-lfric-rose-stems-and-jinja2-issues/525>\
**Category:** Cylc 8 Migration\
**Created:** [August 26, 2022, 6:19am UTC](https://cylc.discourse.group/t/cylc-8-with-lfric-rose-stems-and-jinja2-issues/525 "2022-08-26T06:19:30Z")\
**Posts on this page:** 1\
**Showing post:** 9

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**Author:** ![oliver.sanders](https://yyz2.discourse-cdn.com/free1/user_avatar/cylc.discourse.group/oliver.sanders/32/110_2.png) [@oliver.sanders](https://cylc.discourse.group/u/oliver.sanders)\
**Post date:** [September 5, 2022, 8:37am UTC](https://cylc.discourse.group/t/cylc-8-with-lfric-rose-stems-and-jinja2-issues/525/9 "2022-09-05T08:37:31Z")

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Jinja2 deprecated some old interfaces at version 3.0 (and added warning messages), they have removed back-support at version 3.1.

Cylc is currently sticking with Jinja2 `v3.0.x` in order to give everyone a chance to adapt to the Jinja2 warning messages. There’s more about the update here:

> [@Cylc 8 & Jinja2 v3](https://cylc.discourse.group/t/cylc-8-jinja2-v3/512#upgrade-schedule-6):
>
> Cylc 8 has upgraded from Jinja2 to version 3 In May 2021 a new version of Jinja2 was released, confusingly named version 3. Cylc 8.0.0 uses Jinja2 version 3.0 Most Cylc workflows work with version 3 out of the box with no changes, however, there are a couple of issues it’s worth being aware of. This post outlines what’s changed and what we are doing to minimise the disruption and help the transition go smoothly. Integers with leading zeros There is one significant change which will impact a …

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_[View the full topic](https://cylc.discourse.group/t/cylc-8-with-lfric-rose-stems-and-jinja2-issues/525)._