Hi everyone. I just released fourth milestone of scalaz 7.2 for Scala binary versions 2.10.x, 2.11.x and 2.12.0-M2. "org.scalaz" %% "scalaz-core" % "7.2.0-M4" This is NOT binary compatible with 7.1.x and 7.2.x milestones. There are some new features and changes. please refer to the release notes https://github.com/scalaz/scalaz/wiki/7.2.0-M4 Cheers. Kenji (@xuwei-k)