Numpy versions? I get a RunTime Error

[rubyFeedback]

When doing this:

require 'matplotlib/pyplot'

After "gem install matplotlib",
I get that:

RuntimeError: module compiled against API version 0xe but this version of numpy is 0xd

Numpy I have here is 1.19.0. I can probably downgrade, but would it
be possible to add a short subsection about which numpy version one
should use? It's a cool idea by the way; right now matplotlib sort of
means I have to use python, but I'd prefer to use ruby syntax insteda. :)