Flarum v1.6.1 has been released as a patch release.
You can easily upgrade by using the same upgrade instructions from the v1.6.0 release:
composer update --prefer-dist --no-plugins --no-dev -a --with-all-dependencies
php flarum migrate
php flarum cache:clear
See the upgrade guide documentation for in-depth instructions: https://docs.flarum.org/update#general-steps