Sadly, the word has come down on the future of The Librarians, and it wasn’t good. From producer Dean Devlin:
Sad news. After multiple negotiations at several different networks, we’ve been unsuccessful at moving #TheLibrarians to a new home. Unfortunately that means season 4 was our last season.
— Dean Devlin (@Dean_Devlin) June 6, 2018
The official Facebook page was a bit more hopeful of it continuing in another form at least: