The latest (and greatest) version of ocaml website instructs to install opam and then use an environment of 4.11.1 in the Linux and Mac instructions:
opam switch create 4.11.1
However, there is no available version of 4.11.1 for mac, and the installation fails. Installing 4.13.0 works fine tough, and I see the latest version is 4.14.0.
Are those installation instructions up to date?