Thank you for your answer, everything works perfect!
Could you please clarify how to update? I downloaded the zip file from the downloads tab, but is there a way to update to the new version without loosing the customization of the website that I have already done? Are there specific files I have to replace in ftp or do I have to replace everything?
Deprecated: Function get_currentuserinfo is deprecated since version 4.5.0! Use wp_get_current_user() instead. in /var/www/html/wp-includes/functions.php on line 5383