The bundled version of Tahoe-LAFS is now out-of-date
With the recent switch to new-Magic-Folder, Gridsync no longer strictly depends on Tahoe-LAFS version 1.14. Incidentally, Tahoe-LAFS version 1.16 was just released, bringing numerous bug-fixes and improvements. Accordingly, Gridsync should support, test against, and ship Tahoe-LAFS 1.16, if possible.