Latest one as per https://www.raspberrypi.org/downloads/raspbian/ is:
Raspbian Buster with desktop
Image with desktop based on Debian Buster
Version: September 2019
Release date: 2019-09-26
Kernel version: 4.19
which is the one I’m using and which I did update/upgrade - so assumably it’s the latest one.
Which one did you use ?