If you are using an old Joomla version it is recommended to update to the latest Joomla version to close security leaks and to profit from improved features. With the latest Joomla version your site will have more resistance against hackers and will be harder for them to infiltrate your site.
Tutorial Update Joomla Site:
- First make a backup of your Joomla site with Akeeba or manually download all files with ftp and make a backup of the MySQL database.
- Download the update file
- Unzip the file in a folder.