The package has a debian/watch file, but the last attempt
to use it for checking for newer upstream versions failed with
an error:
In watch file debian/watch, reading FTP directory ftp://ftp.ncbi.nih.gov/repository/blocks/unix/blimps/ failed: 500 Temporary failure in name resolution
autoremoval from testing
Version 3.9+ds-1 of blimps is marked for autoremoval from testing
on 2024-04-29.