Ok, thanks.
FYI, I think that isn't MySQL database installed on my server but MariaDB.
The last version of Plesk (my control panel) on Linux Debian 9 has 10.1 pre-installed (my version is 10.1.26).
https://support.plesk.com/hc/en-us/articles/213403429-How-to-upgrade-MySQL-5-5-to-5-6-5-7-or-MariaDB-5-5-to-10-0-10-1-10-2-on-Linux