I've only got 5.3.176757.1236 and when I check there are no updates available.
When I check for updates it says there is an update available but I did not apply it. Clicking on the "Update Details" link takes me to a history page with old info about the 1216 build. I'm not sure why that page cannot be kept up to date. Old info is worse than no info at all. The "Update Details" link is not very useful,s o if it cannot be made useful, it should be removed. This has always been like this, it's rare when it happens that the info on the page matches the latest version available.