# Promoting releases consistently fails

**URL:** <https://community.convox.com/t/promoting-releases-consistently-fails/480>\
**Category:** Rack (Version 2)\
**Created:** [March 30, 2019, 9:31pm UTC](https://community.convox.com/t/promoting-releases-consistently-fails/480 "2019-03-30T21:31:32Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![epigrammarwebservice](https://avatars.discourse-cdn.com/v4/letter/e/bc8723/32.png) [@epigrammarwebservice](https://community.convox.com/u/epigrammarwebservice)\
**Post date:** [March 30, 2019, 9:31pm UTC](https://community.convox.com/t/promoting-releases-consistently-fails/480/1 "2019-03-30T21:31:32Z")

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Recently updated two racks to the latest version of convox rack, and now `convox deploy` and `convox releases promote` never succeed. After a few seconds, the promotion would stop and the rack would roll back to the previous build. Inspecting AWS CloudFormation, we noticed that the ResourceDatabase instances on both racks had this status:

> UPDATE\_FAILED

> Cannot upgrade postgres from 9.6.11 to 9.6.6 (Service: AmazonRDS; Status Code: 400; Error Code: InvalidParameterCombination; Request ID: […])

We’re not sure how to proceed from here, and any help would be appreciated.

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**Author:** ![rob.sharp](https://avatars.discourse-cdn.com/v4/letter/r/a9a28c/32.png) [@rob.sharp](https://community.convox.com/u/rob.sharp)\
**Post date:** [March 31, 2019, 11:21pm UTC](https://community.convox.com/t/promoting-releases-consistently-fails/480/2 "2019-03-31T23:21:56Z")

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Try setting `version` on the postgres resource to `9.6.11`. You should probably also set `storage` and `class` to whatever you currently have configured. I suspect there are defaults or incorrect values in your convox.yml.