Anyway it would be nice to know what was changed.
Edit: Never mind here's the changelog
Updates to Team Fortress 2 have been released. The updates will be applied automatically when your Steam client is restarted. The major changes include:
Team Fortress 2
Fixed another sentry gun exploit that let Engineers build multiple sentries
Fixed Engineers being able to build level 3 mini-sentries using The Wrangler for real this time