Upgrading Plesk 12.5 to Onyx

Updated: 28 September 2026 · Applies to: Plesk Obsidian 18 on AlmaLinux 9/10, Ubuntu 24.04/26.04 and Debian 12/13

Plesk 12.5 and Plesk Onyx are end of life; the current version is Plesk Obsidian 18, which receives regular updates. Take a full backup (or a server snapshot) before any upgrade.

Upgrade to Plesk Obsidian

1. In Plesk, open Tools & Settings › Updates and choose the upgrade to the latest Plesk Obsidian release.
2. Or from SSH: plesk installer --select-release-latest --upgrade-installed-components.
3. After the upgrade, run plesk repair installation if the panel reports problems, and check your sites.

Very old versions may need an intermediate step; the installer tells you when that is the case.

If the server runs CentOS 7 or another end-of-life system

Upgrading Plesk alone does not fix the unsupported operating system. Set up a new server with AlmaLinux 9 or Ubuntu 24.04, install Plesk Obsidian, and move the subscriptions with Tools & Settings › Migration & Transfer Manager (Plesk Migrator). The old server stays online until you switch DNS.

Tip: Keep automatic updates on in Tools & Settings › Update Settings so Plesk installs its monthly updates by itself.