https://docs.dnncommunity.org/content/getting-started/setup/upgrades/suggested-upgrade-path/index.html
9.3.2 -> most recent
The 9.3.2 is the one where you might encounter impact. Depending on the (amount of) third party extensions. For instance, there was an Newtonsoft issue with DNN Sharp extensions. Speaking of DNN Sharp: they moved as Plant an app towards the concept of Low code. Meaning that s few of their modules is available as stand alone but the majority is part of their low code appbuilder.