LibreOffice 7.6 was officially released today, and I noticed that it drops support for macOS 10.14 Mojave.
As of LibreOffice 7.6, macOS 10.15 Catalina is the new minimum requirement for Macs. (Windows 7 SP1 remains the minimum for Windows PCs.)
I also see that end-of-life for LibreOffice 7.5.x is just a few months away on November 30, 2023. LibreOffice 7.5 users who cannot upgrade to LibreOffice 7.6 should assess their risks and proceed accordingly.
Also note that LibreOffice will be switching to a calendar-based versioning scheme in February 2024, at which point the next major release will be known as LibreOffice 24.2.
Of course, this may or may not matter, depending on what documents you open.
If you only work with documents you created, then go ahead and keep on using version 7.5 until the end of time (or until you upgrade the computer).
If, on the other hand, you open documents received from the Internet, then no longer getting updates could create a security problem.
If possible, use something else (maybe a web app or something with no macro/scripting capabilities) to open Internet-retrieved documents, and reserve LibreOffice 7.5 for already-trusted documents (e.g. ones you created).