Just a short reminder
As known by the most, TufinOS 4.x is available and should be deployed. Since July, 1st, TufinOS 3.x is no more supported since it's based on CentOS 7 which has been depreciated. So for this Linux, no more development or even security patches are available.
There are different ways to upgrade from TufinOS 3.x to TufinOS 4.x. All of them are documented in the Tufin Portal (authentication required)
Please be aware that a backup is required before upgrading. Additionally, TufinOS 4.x is based on Rocky Linux, so some configuration details are different to TufinOS 3.x