Hi Sergio,
1. Do backup from your Panel which include the whole platform structure and database.
2. Upgrade your server OS to the latest release.
3. Restore it.
That is the simplest way to do. Otherwise you need some experience in upgrading the glibc version.
This may require backup restore if the whole process failed.
Besides, newer build has better feature which is needed to activate such as redis session caching server.
Sincerely,
Ariv Ontowiryo