# Guide for custom themes in Mautic 6 | previous themes stopped working after upgrade to version 6

**URL:** <https://forum.mautic.org/t/guide-for-custom-themes-in-mautic-6-previous-themes-stopped-working-after-upgrade-to-version-6/36936>\
**Category:** Mautic 6 Install/Upgrade Support\
**Created:** [November 18, 2025, 9:45am UTC](https://forum.mautic.org/t/guide-for-custom-themes-in-mautic-6-previous-themes-stopped-working-after-upgrade-to-version-6/36936 "2025-11-18T09:45:55Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![rabii](https://sea2.discourse-cdn.com/flex020/user_avatar/forum.mautic.org/rabii/32/13080_2.png) [@rabii](https://forum.mautic.org/u/rabii)\
**Post date:** [November 18, 2025, 9:45am UTC](https://forum.mautic.org/t/guide-for-custom-themes-in-mautic-6-previous-themes-stopped-working-after-upgrade-to-version-6/36936/1 "2025-11-18T09:45:55Z")

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Hey folks,

Is there any new guide on how to build themes for Mautic 6 - all my themes from previous versions 4 and 5 are not working on version 6. i have checked the official themes and followed same steps but still always not display.

what i am missing here ? tried to search on any new tutorials | guides but none available.

all my forms look ugly now because the custom themes stopped working and they would produce an error if they are selected for a form.

They stopped working only when i upgraded to version 6.

Any tips o help would be appreciated 🙂

Thanks