Source: ruby-zip-zip Section: ruby Maintainer: Debian Ruby Team Uploaders: Pirate Praveen Build-Depends: debhelper-compat (= 14), gem2deb, ruby-minitest, ruby-zip (>= 1.0.0) Standards-Version: 4.7.4 Vcs-Git: https://salsa.debian.org/ruby-team/ruby-zip-zip.git Vcs-Browser: https://salsa.debian.org/ruby-team/ruby-zip-zip Homepage: https://github.com/orien/zip-zip Testsuite: autopkgtest-pkg-ruby Package: ruby-zip-zip Architecture: all Description: ease the migration to RubyZip v1.0.0 So you've upgraded a gem dependency that requires RubyZip v1.0.0 or higher. While all your other dependencies use the interface provided by v0.x. . zip-zip provides a simple adapter to let all your dependencies use RubyZip v1.0.0. It is very simple and light weight, aliasing the old class names to the new.