# Error in apt update on Debian 12 - Raspberry Pi 5

**URL:** <https://community.zymbit.com/t/error-in-apt-update-on-debian-12-raspberry-pi-5/1731>\
**Category:** Uncategorized\
**Created:** [January 27, 2025, 3:53pm UTC](https://community.zymbit.com/t/error-in-apt-update-on-debian-12-raspberry-pi-5/1731 "2025-01-27T15:53:57Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![beh](https://avatars.discourse-cdn.com/v4/letter/b/58f4c7/32.png) [@beh](https://community.zymbit.com/u/beh)\
**Post date:** [January 27, 2025, 3:53pm UTC](https://community.zymbit.com/t/error-in-apt-update-on-debian-12-raspberry-pi-5/1731/1 "2025-01-27T15:53:57Z")

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Hi,

I am running a few RPI5 with Debian 12 using Zymkey 4. Recently, when I run apt update, I get an error from [zk-sw-repo.s3.amazonaws.com/apt-repo-bookworm-aarch64](http://zk-sw-repo.s3.amazonaws.com/apt-repo-bookworm-aarch64). It says “The following signatures are invalid: EXPKEYSIG [scott@zymbit.com](mailto:scott@zymbit.com)”

How do I correct this?

Thank you

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**Author:** ![Bob\_of\_Zymbit](https://avatars.discourse-cdn.com/v4/letter/b/82dd89/32.png) [@Bob\_of\_Zymbit](https://community.zymbit.com/u/Bob_of_Zymbit)\
**Post date:** [January 27, 2025, 5:49pm UTC](https://community.zymbit.com/t/error-in-apt-update-on-debian-12-raspberry-pi-5/1731/2 "2025-01-27T17:49:15Z")

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Hello, our keys expired and were renewed in September 2024. The steps to update an old, existing installation can be found here:

[Expired GPG Key Preventing Access to Repository](https://docs.zymbit.com/troubleshooting/general/#expired-gpg-key-preventing-access-to-repository)