4th Edition is the latest edition of GURPS, released on August 19, 2004. By Sean Punch in the Thinking about switching from 3rd to 4th thread in the sjgames.com forums on 2010-06-01: My credentials: I did half of the work of revising 3e to 4e (I can't take credit for David Pulver's half). I did most of the work of coordinating that project. I did the first-pass edit over the results. And I have remained instrumental in enforcing a uniform style and canon for 4e rules (3e was built on 15 years of content that predated my arrival in 1995).