Source: ruby-zip-zip Section: ruby Priority: optional Maintainer: Debian Ruby Extras Maintainers Uploaders: Pirate Praveen Build-Depends: debhelper (>= 7.0.50~), gem2deb (>= 0.7.5~), ruby-zip (>= 1.0.0), ruby-minitest Standards-Version: 3.9.5 Vcs-Git: git://anonscm.debian.org/pkg-ruby-extras/ruby-zip-zip.git Vcs-Browser: http://anonscm.debian.org/gitweb/?p=pkg-ruby-extras/ruby-zip-zip.git;a=summary Homepage: https://github.com/orien/zip-zip XS-Ruby-Versions: all Package: ruby-zip-zip Architecture: all XB-Ruby-Versions: ${ruby:Versions} Depends: ${shlibs:Depends}, ${misc:Depends}, ruby | ruby-interpreter, ruby-zip (>= 1.0.0) 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.