I just noticed that 9.0.0.4 has been released and like with previous 9.0.0.x updates, the built-in update checker tells me my software is up to date when in reality it is not. Is the update checker just not up to date on the server end?
The automatic update check lags behind a bit to spread out the downloads and uptake of new versions. Firefox and other software do the same thing.
If you're keen to get updates as quickly as possible you can subscribe to the announcements forum to receive email notification of new versions.