Wt 4.3.0 was released almost a month ago, so it’s about time for a patch release. Wt 4.3.1 (and Wt 3.6.1) is a tiny patch release, with the most notable fix being an issue in the destructor of WWebWidget when user-defined ids were used. There will be no JWt 4.3.1 since nothing has changed to JWt.