Hi everyone. I just released 25th milestone of scalaz 7.3 for Scala binary versions 2.11.x, 2.12.x and 2.13.0-M4 "org.scalaz" %% "scalaz-core" % "7.3.0-M25" This is NOT binary compatible with 7.2.x and 7.3.x milestones. There are many new features and changes. please refer to the release notes https://github.com/scalaz/scalaz/wiki/7.3.0-M25 Cheers. Kenji (@xuwei-k)