The latest changelog is available here:

https://www.microids.com/xiii-patch-notes/
Update (18 December 2020)

Greetings,

We’re to pleased to share with you a new update concerning XIII. Ever since the launch of the game, Microids and Playmagic have been listening to the community’s feedback and our teams have been continuously working to provide you with a better experience.

You’ll find below a summary of this patch’s fixes :

• Weapon improvements (balancing, animations, sound effects, Grenade timer, Keybinding on PC) • Animation improvements (further fixed on Ragdoll system, polish in several cutscenes and in-game sequences) • Gameplay improvements (checkpoints added after flashbacks, Ammunitions and Medkits management, tweaks on some bosses, further audio additions and fixes) • Art debugging and improvements (various collision and occlusion bugs, lighting)
Update (07 December 2020)

Greetings,

A new patch for XIII is now available, which includes additional fixes for the issues that players have been encountering.

Ever since the launch of the game, our teams have been listening to the community’s feedback and are working hard on the release of new updates and patches to fix the game’s issues and bugs. Rest assured that we will keep working on providing players with regular patches that will allow for an improved playing experience.

You'll find below a summary of this patch's fixes:

Weapon improvements (balancing, animations and other tweaks, projectiles, multiplayer pickups) Better Gameplay experience with many AI fixes (better reaction and behavior, tweaks on some bosses), further audio additions and some fixes on ragdoll system Art debugging and improvements (various collision and occlusion bugs, more polish in levels)

The full patch notes are available on Microids' official website.
Update (24 November 2020)

The teams at Microids and PlayMagic invite you to download a new patch for the game XIII.

This patch fixes some of the issues you may have encountered since the beginning of your adventure. The teams are working relentlessly to provide you with regular patches to improve your playing experience.
You'll find below a summary of this patch's fixes:

Weapon improvements (balancing, animations, tweaks, notably on ADS on machine guns, some audio)

Better Gameplay experience : AI bugs where enemy would not react, in-game objective markers, UI glitches, new narrative sequences, more user-friendly pickups, achievements tweaks, various bugs related to checkpoints and potential blockers

Art debugging and improvements (various collision and occlusion bugs, optimization, animation glitches, a lot of polish in levels – adding VFX, light, etc..)

Notable fixes on users feedbacks : mouse sensitivity, weapons animations and sounds (partially)