You should know that DOPus rolls out the automatic updates some time after files land here. There are good practical reasons for this, as was pointed out to me when I made the same observation some months ago.
The previous version never even made it out to the automatic update for your copy to detect. They put together an even newer version that has yet to hit the update feed.
This is actually one reason I was given for the roll out strategy, it gives them time to find and fix bugs that show up among a larger band of users.
As an experiment, and because none of the bugs and things fixed in recent versions affect me, I have left it to the updater to alert me. It still shows me as up to date, but I am still on 184.108.40.206.3156.x86
If you do have problems, then it is probably a good idea to manually check the version.