Unison

Changes in 2.54.0

Released 2026-05-01

• Drop old wire protocol. Unison will no longer interoperate with
  versions before 2.52.0 and will no longer read pre-2.52.0 archive
  files.

• Document that LLM output is unwelcome in the Unison project (code,
  issues, mailinglists, etc.).

• Add desktop file.

Deprecation warning: support for external rsync will be removed;
this may happen even in a micro release.

DEPRECATION MAY HAPPEN WITH LESS THAN TYPICAL NOTICE:
lablgtk is difficult to use safely, and future maintenance is
unclear. Implementing the GUI without lablgtk requires more effort
than seems likely to happen. Thus, it is possible that support for
the unison GUI may end suddenly, on a particular platform, or on all
platforms -- even in a micro release. See
https://github.com/bcpierce00/unison/issues/1075

MAINTENANCE WARNING: No one is contributing to verify that the Mac
GUI continues to work -- so it might not. (So far, there are no
reports of serious, frequent failures.)