3uc/4uc mod seems to break this mod. Wait for their next version to fix.

Added an optional dependency of a certain Pontoon Bridge mod released by the same owner of this mod...
Something changed about Sierra Leone not balance-wise.
Singapore Reworked: All Diplomatic Units receive the Nobility Promotion.
Not save-game compatible.

Updated UCS Icons.
Reduced the Pledge of Protection's Military Requirement from 60% to 50%.
Saint Celestinus now properly reduces Distress.
Fixed Civilopedia Entry for the new city-states.

Not save-game compatible.

https://forums.civfanatics.com/threads/unique-city-states.607883/page-16#post-15356812

Not save-game compatible.

(Thinking) Fixed the Cahokia's Mounds and Brussel's Marshes by removing it.
Bylina's Gold Maintenance reduced from 8 to 4.
House of Visconti's Gold Maintenance reduced from 6 to 3.
The Gate of Dawn's Gold Maintenance reduced from 4 to 2.
Bylina, House of Visconti, and The Gate of Dawn will always be lost upon capture unless you're rome or something.
Fixed a bug where capturing a city under Kathmandu's or Kabul's bonuses let you keep it permanently.
M'Banza Kongo's promotion no longer works on naval units.

Not save-game compatible.

Added a hidden fix for a rare bug involving EUI and non-EUI Lua versions associated with this mod.
Fixed a bug where minors(not Brussels and Cahokia respectively) were building Mounds and Marshes.
Brussel's Bonus reworked: Marsh Improvement now persist upon construction while still granting a Marsh upon construction(this helps the AI when they decide to continuously place a fort(which provide yields) or a Marsh).
What does this mean? It means Marsh Improvement now benefits of the 3 different ideological tenet that benefits Unique Improvements.
Marsh Improvement now grants +1 Food.
Brussel still grants +1 Culture to Marshes.
Mound's Gold bonus reduced from +3 to +2(moved to CS's Bonus, if you lose the CS you'll get +2)
Mound's Golden Age Points reduced from +2 to 0(moved to CS's bonus if you lose the CS, you'll get nothing.)
Added text that Mound will gain +3 GAP when built adjacent to a city and provide nearby +1 Gold/GAP to adjacent villages/towns.

Not save-game compatible.

A bugfix

Changelog looks something like this... I don't exactly remember the exact changes, but it looks very similar to it.

https://forums.civfanatics.com/threads/unique-city-states.607883/page-11#post-15196923

Not save-game compatible.

Something about a UI bug fix. No big updates yet.

Save-game compatible, I suppose?

Fixed a bug with Auckland.
Armagh's Saints should be able to grant construction bonus.

Not save-game compatible.