I am currently using version 2.1 of FastLED for my projects.  Are there any

Archive FastLED Archive
,
1

I am currently using version 2.1 of FastLED for my projects. Are there any changes that I should be aware of upgrading to version 3.1?
Or would I be better off going to version 3.0 at this time?

2

https://github.com/FastLED/FastLED/blob/FastLED3.1/release_notes.md

In FastLED3.1 there is support for interrupts added. If you don’t need that I think it’s better to stick with 3.03.