Before upgrading to version 4.x, check that:
- the autopkgtest is passing;
- the rdeps build.

In Spring 2025, we uploaded version 4.0.0 but it broke the rdeps, hence we were back to 3.x.

 -- Pierre Gruet <pgt@debian.org>  Fri, 18 Apr 2025 15:19:57 +0200
