For version 5.7.3 you will need to be updated to the new WordPress version 4.7 released earlier this week.
There is also nothing really significant in this release but it is full of small enhancements and tweaks which we hope make many things better in some small way.
As always the change log is available to view in the forum toolbox. And for a change there are absolutely no theme changes included in this update – so no new codex page.
But – as always – we do recommend all our users to upgrade.