Updating flatpak

My version of LibreOffice is 24.2, loaded with LinuxMint. Version 26.2 is out. How do I upgrade? And, if the answer is to download from online, what download do I use? You give two options for Linux and my System Info does not specify.

Also, your ‘similar questions’ list seems to say that LibreOffice will simply update itself from Flatpak. But mine still identifies itself as 24.2. What’s to be done?

LibreOffice in Flatpak format | LibreOffice - Free and private office suite - Based on OpenOffice - Compatible with Microsoft

what says uname -a ?