An update to Team Fortress 2 has been released. The update will be applied automatically when you restart Team Fortress 2. The major changes include:

• Added Benign infiltration to the Mann Vs. Machine mission-cycle file for servers
  
• Fixed a Dead Ringer Spy exploit in Mann Vs. Machine mode
  
• Fixed a regression with mini-crit damage calculation
  
• Fixed a client crash in the Medi Gun charge meter when using a custom HUD
  
• Fixed Festive Huntsman arrows and Rescue Ranger bolts using incorrect hit boxes
  
• Fixed Tough Stuff Muffs not using the correct model for the Engineer
  
• Fixed a clipping problem with the Hunger Force
  
• Fixed Strange Festive Sandviches leveling up multiple times in a single use
  
• Fixed a lighting issue in mvm_bigrock
  
• Updated the backpack icon for the Festive Ambassador