upgrading to last libreoffice version

I have installed libreoffice in Linux Mint but I would like to get a better version upgrading directly. It is possible? In this case I would like to know how to that.

You can’t upgrade LibreOffice from within LibreOffice. You also can’t upgrade LibreOffice with you package manager if your distribution doesn’t have newer version in repository. You should remove LibreOffice manually, download newer version manually, install newer version manually. But that’s a question for forum of your distribution.

Good luck!