# Updating Pega Platform from 8.8.5 to '24.2.1

**URL:** <https://forums.pega.com/t/updating-pega-platform-from-8-8-5-to-24-2-1/9353>\
**Category:** Pega-as-a-Service\
**Tags:** updates, 8-8-5, 24-2-1, devops, pega-platform\
**Created:** [April 14, 2025, 1:45am UTC](https://forums.pega.com/t/updating-pega-platform-from-8-8-5-to-24-2-1/9353 "2025-04-14T01:45:10Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![TakaoM16928076](https://yyz2.discourse-cdn.com/pega/user_avatar/forums.pega.com/takaom16928076/32/9672_2.png) [@TakaoM16928076](https://forums.pega.com/u/TakaoM16928076)\
**Post date:** [April 14, 2025, 1:45am UTC](https://forums.pega.com/t/updating-pega-platform-from-8-8-5-to-24-2-1/9353/1 "2025-04-14T01:45:10Z")

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Hi,

We will soon be updating to Pega Platform ‘24.2.1’.  
In the current application (Pega Platform 8.8), “Theme-Cosmos 04.01” is set as the source application in the application definition.

We are wondering if it is necessary to change the specification (version number, etc.) of the source application in the above application definition after upgrading the Platform version.

I would like to know if this needs to be changed and, if so, what should be changed. Please let me know if you have any documents that would be helpful.

Thank you.

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**Author:** ![SohamM95](https://yyz2.discourse-cdn.com/pega/user_avatar/forums.pega.com/sohamm95/32/4726_2.png) [@SohamM95](https://forums.pega.com/u/SohamM95)\
**Post date:** [April 14, 2025, 4:57am UTC](https://forums.pega.com/t/updating-pega-platform-from-8-8-5-to-24-2-1/9353/2 "2025-04-14T04:57:20Z")

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@TakaoM16928076

As far as I know, Theme-Cosmos 05.01 is the most updated version and you should be able to see it available in the application definition. Although you can still keep on using 04.01 if it suffices your requirements.

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<div class="post-metadata">

**Author:** ![TakaoM16928076](https://yyz2.discourse-cdn.com/pega/user_avatar/forums.pega.com/takaom16928076/32/9672_2.png) [@TakaoM16928076](https://forums.pega.com/u/TakaoM16928076)\
**Post date:** [April 14, 2025, 5:05am UTC](https://forums.pega.com/t/updating-pega-platform-from-8-8-5-to-24-2-1/9353/3 "2025-04-14T05:05:01Z")

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Hello, @SohamM95

Thank you for your useful comments.  
It will be helpful.  
Thank you.