Mysql upgrade

Hi there,
I am currently using MySQL 5.5.50 on my server. (It might be MariaDB actually).

How can I upgrade this to a later version, even just 5.5.52, although higher would be preferable…

The server is CentOS7 64 bit.

Many thanks,
Craig

Hi all,
Can anyone help with this?
Is it possible?

Thanks,
Craig