# Still Using Jupyterhub \< 4?

**URL:** <https://cylc.discourse.group/t/still-using-jupyterhub-4/933>\
**Category:** Cylc Announce\
**Created:** [April 5, 2024, 10:27am UTC](https://cylc.discourse.group/t/still-using-jupyterhub-4/933 "2024-04-05T10:27:40Z")\
**Posts on this page:** 1\
**Page:** 1

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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:** [April 5, 2024, 10:27am UTC](https://cylc.discourse.group/t/still-using-jupyterhub-4/933/1 "2024-04-05T10:27:40Z")

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Heads up, if you’re using Cylc with Jupyter Hub, the upcoming Cylc 8.3.0 will require Jupyter Hub version 4.0.0 or above.

As follow up to this announcement:

> [@Cylc 8.2.0 Released](https://cylc.discourse.group/t/cylc-8-2-0-released/702/5):
>
> We have released cylc-uiserver 1.4.0. This update upgrades cylc-uiserver to work with the most recent versions of Jupyter components, namely: Jupyter Server v2.7+ Jupyter Hub v4.0+ This release offers some big improvements for sites looking to deploy the Cylc GUI with Jupyter Hub: Users can now be authorised to start UI Servers on behalf of other users. There is now a box in the top-left of the GUI for switching user / deployment. The Cylc UI Server can now be deployed along with the lates…

We currently support Jupyter Hub versions 1 - 3 with cylc-uiserver 1.3, and Jupyter Hub 4+ with cylc-uiserver 1.4.

Jupyter Hub version 4 (and the related Jupyter Server version 2) represent a major improvement that makes multi-user Cylc setups much nicer (users can now spawn each others servers) and provide finer grained and more extensive authorisation interfaces.

Information on configuring up multi-user setups where users can spawn and access each other’s servers: [Authorizing Others to Access Your Workflows — Cylc 8.2.4 documentation](https://cylc.github.io/cylc-doc/stable/html/user-guide/sharing-access-to-workflows.html)