Using sysupgrade will cause your system to fetch all file sets. If you would rather choose your own, use signify(1) instead.
Now that OpenBSD 7.1 has been released, it's time to start the incredibly easy task of performing a system upgrade.
For a typical unattended upgrade, all we have to do is run sysupgrade(8) and let OpenBSD upgrade itself:
# sysupgrade
That's it. Seriously. Under certain circumstances, sysmerge(8) fails to automatically update the required configuration files. In that case, we can just run it manually:
# sysmerge
If you want to upgrade another way, the official FAQ has an excellent upgrade guide.