Upgrading to a new version

Make sure that your opam is in version 2

The last version of grew requires that the opam tool is in version 2.0.0 or higher.

You can check your versions with the command opam --version. It it’s not version 2, re-install opam in version 2 with instructions steps 1 and 2 on the Installation page.

Update prerequisite


apt-get update && apt-get upgrade

On Mac OSX

sudo port sync && sudo port upgrade outdated

Update the Grew software

opam update
opam upgrade

Update the Python binding

pip install grew --upgrade