The Internet Systems Consortium has stopped maintaining their DHCP client, which is standard on a lot of distros.
Debian has updated its documentation and now warns users to choose an alternative:
https://packages.debian.org/bookworm/isc-dhcp-client
On Debian Unstable, I was already forced to uninstall it in yesterday’s upgrade.
If you’re using network-manager, you don’t need to worry, since it includes its own dhcp client, but for others, this might be relevant.
On Arch, this concerns the dhcpd package:
https://wiki.archlinux.org/title/Dhcpd
Yes; I wanted to mention that dhcpcd is not affected because the title explicitly mentions the DHCP client (dhclient), so people might go looking for alternative DHCP clients in the comments.
I think it’s a bit confusing that you mentioned the DHCP client (dhclient) and DHCP relay (dhrelay) in the title, then link to the Arch Wiki article about the DHCP server (dhcpd). Yes, dhrelay is contained in the dhcpd package (dhclient, however, is not), but I assume most people will be using a DHCP client and few will be operating a DHCP server or relay.