Hydra Releases 4.0.0
On April 24, 2012 the Hydra developers "who make Hydra happen" released Active Fedora 4.0.0 and HydraHead 4.0.0
The gems are at:
https://rubygems.org/gems/active-fedora/versions/4.0.0
https://rubygems.org/gems/hydra-head/versions/4.0.0
and supporting libraries at:
https://rubygems.org/gems/om/versions/1.6.0
https://rubygems.org/gems/solrizer-fedora/versions/2.0.0
Read more about the release on the Hydra Project web site: http://hydraproject.org/2012/hydra-releases-4-0-0/