If Curator has been installed via pip, the preferred way to upgrade is:

pip install -U elasticsearch-curator

If you need to manually upgrade, follow the installation instructions for installing from source to obtain the most recent versions of both elasticsearch-py and Curator.

You should then be able to run:

pip install -U elasticsearch-py.tar.gz

and then:

pip install -U elasticsearch-curator.tar.gz

If Curator has been installed via package repository, then use the standard upgrade method for your repository.