Steam News has details on a new Team Fortress 2 patch that's automatically available for Valve's teamplay shooter. Here are the patch notes.

Team Fortress 2

• Fixed an exploit that allowed Engineers to build level 2/3 mini sentries.
• Fixed a bug that allowed sapped buildings to be picked up by the Engineer
• Fixed a bug where Wrangled level 3 sentryguns would still fire rockets when they were out of ammo.
• Fixed a bug where players would go into reference poses when switching classes while carrying a building.
• Fixed seeing the changeclass label in the spectator HUD when using cl_hud_minmode.
• The amount of revenge crits a player can have at one time is now capped at 35.
• The Wrangler no longer shows the shotgun's ammo count.
• Engineers can no longer pick up buildings while stunned or in loser state.
• Fixed Engineer shotgun and piston not using team skins for the Engineer's arms.
• Fixed an issue where Wrangled sentrygun effects wouldn't be attached to the sentrygun.
• The Gunslinger 3 hit combo now only increments the combo count when hitting enemy players.
• Fixed a crash in the control point progress bar.
• Fixed a server crash in the player death code, related to building carrying.
• Fixing performance spikes that occur at round start, and after each point capture, when TFBots are present in the server.
• Achievement fixes:
  • The "Rio Grind" achievement limit is now correctly set to 50.
  • Fixed a typo in Six-String Stinger achievement name.
  • Fixed a bug in the "Death Metal" achievement that caused it to rapidly complete itself.
  • Fixed getting the Six-String Stinger achievement without playing the guitar.
  • Fixed sentrygun detection code in "Best Little Slaughterhouse in Texas" and "Deputized".
• Missed notes from yesterday's release:
  • New response rules and sounds added for some classes