Via [url=https://list.valvesoftware.com/]HLDS[/url]:

[quote=Valve]- Security and stability improvements
- Fixed a client crash related to previewing market items
- Fixed Strange cosmetic items not counting buildings_destroyed for buildings destroyed by a sapper
- Fixed looping particle effects being orphaned when players are killed or force-respawned
- Fixed Taunt: Shooter's Stakeout using one of the Engineer's voice lines
- Updated Smissmas Swirls, Amethyst Winds, and Golden Gusts Unusual effects
- Fixed visibility issues in bright environments
- Reduced delay before the swirls start in order to accommodate short taunts
- Updated Sparkling Spruce, Glittering Juniper, and Prismatic Pine Unusual effects
- Raised the default height of the effect in order to prevent clipping issues
- Updated the Sparkling Lights Unusual effect
- Fixed visibility issues in bright environments
- Updated Condescending Embrace Unusual effect
- Fixed the effect not moving when taunting[/quote]

Rumor has it:

- A lot has changed in the world since the last update, but [url=https://translation.steampowered.com/]Translators Like You (- Thank You)[/url] continue to work their magic to [url=https://github.com/SteamDatabase/GameTracking-TF2/commit/18673b4857a326d650518392ff3bb5e9bce77432]help put together some updated localization files[/url]

- This is just the 2nd update to occur in 2022 so far. A new 2nd-longest drought of 82 days (from 1/5/22 through to today) has been brought to an end with this update

- The old 2nd-longest drought now becomes 3rd-longest, which was an 80 day stretch from 1/18/20 to 4/7/20

- The first half of the year has been prone to repetitive droughts in recent years. By this point in 2021, 2 updates had also been released (the next on 6/22/21 ended the record-long drought of 112 days). By this point in 2020, 1 update was released (the next not until 4/7/20). And by this point in 2019, 4 updates had been released

- Size is close to 40 MB