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:

Left 4 Dead 2

• Updated Dead Air
  
• Made change to prevent rushing issue in The Terminal.
  
• Removed truck roof exploits in finale.
  
• Added Infected entry points to respawn closet in finale.
  
• Fixed finale scoring.
  
• Removed defib from Versus Finale.