OpenBSD Upgrade 7.8 to 7.9

Summary The OpenBSD project released 7.9 of their OS on 19 May 2026, as their 60th release 💫 What's New | Changelog This post shows how to upgrade OpenBSD 7.8 to 7.9. The steps are based on their official guide with appreciation to them. Tutorial Here is a step-by-step guide with a set of command-lines to run. 🌷 🐡 🌅 1. Pre-upgrade: Validate and customize The official tutorial includes Before using any upgrade method section. Using sysupgrade is usually a good choice. Validate available disk size /usr should be greater than 1.1GB. $ df -h Filesystem Size Used Avail Capacity Mounted on (...) /dev/sd0e 7.8G 1.8G 5.6G 25% /usr OK :) Validate compatibility with the current usage See Configuration and syntax changes and Special packages . The latter this time includes PostgreSQL major update to 18.1 . Backups (Optional) You might have to create some backups. Customize upgrade (Optional) This step is just for reference, skippable with standard upgrade. /auto_upgrade.conf is available as the response file. Of course, you can skip this and go next if it's unnecessary. The default behavior is sufficient in most cases. Well, the OpenBSD manual page on autoinstall says: If either /auto_install.conf or /auto_upgrade.conf is found on bsd.rd 's built-in RAM disk, autoinstall behaves as if the machine is netbooted, but uses the local response file. In case both files exist, /auto_install.conf takes precedence. The whole example of /auto_upgrade.conf is like: Location of sets = disk Pathname to the sets = /home/_sysupgrade/ Set name(s) = -x* Set name(s) = +xbase* Set name(s) = -game* Set name(s) = done Directory does not contain SHA256.sig. Continue without verification = yes In this case, x sets except xbase and game are excluded. Also, /upgrade.site can be applied. 2. Upgrade with sysupgrade OK. You must be ready. * Caution: The command below, sysupgrade , is unable to stop once it is run. Let's just run it, if ready: $ doas sysupgrade It will print out like this: Fetching from ht