Question
How to exclude a system package from update?
Answer
Go to Tools & Settings > Update Settings (Update and Upgrade Settings in Plesk Onyx) and switch to the All Packages tab:

Search for package(s) that should be excluded from update:

Select the package(s) using the check-box and click Lock:

In the confirmation window, click OK:

Packages that have been prevented from updates will now be marked with a grey lock:
