Via the Steam Store:

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:<br/> <ul style="padding-bottom: 0px; margin-bottom: 0px;" ><li>Fixed players not being able to push the payload cart on some maps <li>Fixed a client crash related to the main menu <li>Fixed a client crash when exiting the game <li>Fixed not being able to pickup item_bonuspack entities that have not been assigned to a specific team <li>Added self-damage when using the Short Circuit's orb to attack an enemy at close range <li>Added the new Pyro weapons to the list of weapons that can be found via random drops <li>Added The Heartfelt Hero medal for the Hugs.tf 2018 community event <li>Updated ctf_foundry<ul style="padding-bottom: 0px; margin-bottom: 0px;" ><li>Organized powerup locations to be more consistent with other maps <li>Removed the crit powerup in the center of the map <li>Fixed the return times for dropped flags</ul></ul>