The Fedora Linux 40 Beta was released today[[1]] and our Fedora CoreOS `next` 
stream has been migrated to Fedora Linux 40 content. Existing nodes on the 
`next` stream will update as normal over the following days.

The Fedora Project accepted changes for Fedora 40 are in the Wiki[[2]] and the 
Fedora CoreOS analysis of each change is documented in the tracker[[3]].

The following changes require special attention:

- Podman v5.0
    - https://fedoraproject.org/wiki/Changes/Podman5
    - https://github.com/coreos/fedora-coreos-tracker/issues/1629

The following changes may impact some specific setups:

- Switch to using OSBuild for most CoreOS boot image building
    - Newly deployed `qemu` or bare `metal` systems will use disk images built 
using OSBuild.
    - https://github.com/coreos/fedora-coreos-tracker/issues/1653
- Enable IPv4 Address Conflict Detection by default
    - Conflict detection can delay startup by ~200ms.
    - 
https://fedoraproject.org/wiki/Changes/Enable_IPv4_Address_Conflict_Detection
    - https://github.com/coreos/fedora-coreos-tracker/issues/1656
- Assign individual, stable MAC addresses for Wi-Fi connections
    - If you are using WiFi, then your systems MAC address will likely change 
after the update.
    - https://fedoraproject.org/wiki/Changes/StableSSIDMACAddress
- Switch pam_userdb from BerkeleyDB to GDBM
    - If you have overlayed vsftpd on your systems and use pam_userdb, then you 
need to convert the database using the instructions from 
[pam_userdb](https://docs.fedoraproject.org/en-US/fedora/rawhide/system-administrators-guide/pam_userdb/).
    - https://fedoraproject.org/wiki/Changes/PamBerkeleyDBtoGdbm
    - https://github.com/coreos/fedora-coreos-tracker/issues/1634

Please test out the `next` stream over the coming weeks and report any issues 
in our issue tracker[[4]].

Thank you to everyone helping find issues by running the `next` stream!

The Fedora CoreOS Team

[1]: https://fedoramagazine.org/announcing-fedora-linux-40-beta/
[2]: https://fedoraproject.org/wiki/Releases/40/ChangeSet
[3]: https://github.com/coreos/fedora-coreos-tracker/issues/1626
[4]: https://github.com/coreos/fedora-coreos-tracker
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