Disable notifications for update in Calibre (MacOS) in classrooms

Hi,

We are preparing the software which will be used by our students (12-16 years) in Geneva, on our Mac labs and Calibre will be present. This software won't be updated during the school's year, so is it possible to disable notifications for update on every launch oc calibre, when an update is available ?
It will be great for our students.

Thanks in advance

Christian