# Do DARs need to be reuploaded across Canton upgrades?

**URL:** <https://forum.canton.network/t/do-dars-need-to-be-reuploaded-across-canton-upgrades/6445>\
**Category:** App Development\
**Tags:** dar, canton\
**Created:** [April 19, 2023, 12:08pm UTC](https://forum.canton.network/t/do-dars-need-to-be-reuploaded-across-canton-upgrades/6445 "2023-04-19T12:08:05Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![Mr\_Mannoroth](https://yyz2.discourse-cdn.com/flex034/user_avatar/forum.canton.network/mr_mannoroth/32/5824_2.png) [@Mr\_Mannoroth](https://forum.canton.network/u/Mr_Mannoroth)\
**Post date:** [April 19, 2023, 12:08pm UTC](https://forum.canton.network/t/do-dars-need-to-be-reuploaded-across-canton-upgrades/6445/1 "2023-04-19T12:08:05Z")

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Do DARs need to be reuploaded across Canton upgrades? If no, any exceptions to that?

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**Author:** ![bernhard](https://yyz2.discourse-cdn.com/flex034/user_avatar/forum.canton.network/bernhard/32/356_2.png) [@bernhard](https://forum.canton.network/u/bernhard)\
**Post date:** [April 19, 2023, 5:30pm UTC](https://forum.canton.network/t/do-dars-need-to-be-reuploaded-across-canton-upgrades/6445/2 "2023-04-19T17:30:37Z")

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Hi @Mr_Mannoroth , no, Canton upgrades are fully data preserving.

The exception to this _may_ be major version upgrades (eg Daml 1.18.3 to Daml 2.0 where you did need to reupload the packages).