Updates to Left 4 Dead 2 have been released. The updates will be applied automatically when your Steam client is restarted. The major changes include:

Blood Harvest Campaign:
- Item density revision.
- Several minor bugs fixed.

Blood Harvest 3:
- Fixed a potential exploit where survivors were able to jump to onto the cliff side prior to the train onslaught.
- Added tooltip to prompt players to fight to the safe room when the onslaught begins.

Blood Harvest 4:
- Changed the lights on first large train depot building to be non-solid, to prevent survivors from being able to jump into the upper windows.
- Moved a bookshelf in front of a window on the ground-floor of the last building in the level.
- Adjusted the slope of the concrete that makes up the bottom section of the last building in the map so that players slide off of it. It was previously used as part of an exploit to skip content.
- Doubled the height of the fence that leads around the last building in the map to prevent players from skipping the final building.
- Added tooltip to prompt players to fight to the safe room when the onslaught begins.
- Added new a new spawn location on the final bridge for infected.
- Removed a piece of railing along the final bridge to create an opening for infected attacks.

Blood Harvest 5:
- It should now be much harder to get stuck inside of the APC when it arrives.