joostruis, Due to an unfortunate security issue with #xz that got exposed just yesterday (within 24 hours of our 1.5 release) we decided to withdraw that release and instantly prepare a revision that is not affected in any way by this.
So here we are! Version 1.5.1 Released!
https://github.com/mocaccinoOS/mocaccino/releases/tag/v1.5.1