diff --git a/Gemfile b/Gemfile
index 0752847..d61f487 100644
--- a/Gemfile
+++ b/Gemfile
@@ -30,6 +30,7 @@ gem 'rack-cors'
 gem 'rack-contrib'
 gem 'liquid',                    '~> 3.0.3'
 #gem 'grape-swagger-rails'
+gem 'rubyzip'
 
 # FIXME list here all actual dependencies (i.e. the ones in debian/control),
 # with their GEM names (not the Debian package names)
--
libgit2 0.21.2