Hello all —
Long time no see. I’ve spent some time this year breathing some new life into the Lift Framework again. Lift 3.5.0, the current stable release, was released in October of 2021. I’m pretty sure that was while I was still in a weird sleeping routine with my youngest. 
I recommend taking a read through the release notes for each successive milestone of Lift 4 - each one has some degree of breaking changes. Some more (removal of lift-json and replacing it with json4s) some less (nuking deprecated functions from the 3.5 cycle).
The big development from the milestone release this morning is we’re officially pushing Scala 3 artifacts now. Our plan is to let Lift 4.0 be a migration path between Lift 3 which was Scala 2.12 and Lift 5 which will drop support for Scala 2 altogether.
If you’re a user of Lift, please take a look at the most recent milestones and let us know how it goes!
Matt