# Flowable Upgrade from 6.4.1 to 6.7.2

**URL:** <https://forum.flowable.org/t/flowable-upgrade-from-6-4-1-to-6-7-2/10001>\
**Category:** Flowable Engine\
**Created:** [December 14, 2022, 5:11pm UTC](https://forum.flowable.org/t/flowable-upgrade-from-6-4-1-to-6-7-2/10001 "2022-12-14T17:11:29Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![FLOW555](https://avatars.discourse-cdn.com/v4/letter/f/c67d28/32.png) [@FLOW555](https://forum.flowable.org/u/FLOW555)\
**Post date:** [December 14, 2022, 5:11pm UTC](https://forum.flowable.org/t/flowable-upgrade-from-6-4-1-to-6-7-2/10001/1 "2022-12-14T17:11:29Z")

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I just started to upgrade Flowable from 6.4.1 to 6.7.2, Noticed UI modules consolidated into one in the latest version. Also It looks like FlowableAppUser got removed.  
what is the alternative for the above class for custom authentication?

Another question, Flowable 6.7.2 intern uses Spring 5.3.14, Boot 2.6.2 ; can i override with latest spring version say 5.6 or 6.0? do you see any compatibility issue with flowable functions?

appreciate your response

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**Author:** ![filiphr](https://yyz1.discourse-cdn.com/flex035/user_avatar/forum.flowable.org/filiphr/32/315_2.png) [@filiphr](https://forum.flowable.org/u/filiphr)\
**Post date:** [February 24, 2023, 9:18am UTC](https://forum.flowable.org/t/flowable-upgrade-from-6-4-1-to-6-7-2/10001/2 "2023-02-24T09:18:33Z")

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Hey @FLOW555,

We removed the use of FlowableAppUser and now we entirely use Spring Security, so you can use whatever you want for that.

Keep in mind that the Flowable UI Applications are only example applications.

> [@FLOW555](#):
>
> Another question, Flowable 6.7.2 intern uses Spring 5.3.14, Boot 2.6.2 ; can i override with latest spring version say 5.6 or 6.0? do you see any compatibility issue with flowable functions?

You could try to override, but we cannot guarantee that it will work. We have tested the applications with Spring 5.3 and Boot 2.6.

Cheers,  
Filip