Update the version i have

hi im using dolibarr version 14.0.5,
i want to update the current version i have to 15 without losing any data ??

Yes of course you can upgrade without loosing data.

But, in order to be safe : ALWAYS DO A BACKUP BEFORE UPGRADE

thank you for your reply, but can you tell me the steps to update ??
should i just unzip the .zip folder ??