That is a really big jump in versions. There have been a bunch of breaking changes in between those two.
My recommendation is to revert back to your previous version. Then take each new version one at a time and go thru all of the breaking changes for each and get that version working. Then move to the next one.
Or if you don’t have a very big system it might just be easier to start from scratch and add everything back in using the newest docs to make sure it works.