# Upgrading 8.5.2 to 8.5.6 fails with foreign key error

**URL:** <https://forums.concretecms.org/t/upgrading-8-5-2-to-8-5-6-fails-with-foreign-key-error/8105>\
**Category:** Using Concrete / Help\
**Created:** [September 11, 2024, 4:13am UTC](https://forums.concretecms.org/t/upgrading-8-5-2-to-8-5-6-fails-with-foreign-key-error/8105 "2024-09-11T04:13:18Z")\
**Posts on this page:** 1\
**Showing post:** 11

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**Author:** ![Myq](https://forums.concretecms.org/user_avatar/forums.concretecms.org/myq/32/4281_2.png) [@Myq](https://forums.concretecms.org/u/Myq)\
**Post date:** [April 29, 2025, 5:07am UTC](https://forums.concretecms.org/t/upgrading-8-5-2-to-8-5-6-fails-with-foreign-key-error/8105/11 "2025-04-29T05:07:25Z")

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Have you tried following the information here:  
[Upgrading Concrete from 8.5 to 9.x :: Concrete CMS](https://documentation.concretecms.org/tutorials/upgrading-concrete-85-9x) ?

If you have, see if all the tables are set with the same collation: [Issue after 8.5.x update towards 9.x - Foreign key constraint is incorrectly formed](https://forums.concretecms.org/t/issue-after-8-5-x-update-towards-9-x-foreign-key-constraint-is-incorrectly-formed/7438)

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