Installation issue: ffi requires Ruby version >= 2.3

[kbhalla1]

Sorry if this is a noob question, but I'm having some trouble installing this:

cat /etc/redhat-release

CentOS Linux release 7.9.2009 (Core)

I've done a 'yum install gem', then attempting to install transmisison-rss:

gem install transmission-rss

ERROR: Error installing transmission-rss:
ffi requires Ruby version >= 2.3.

ruby -v

ruby 2.0.0p648 (2015-12-16) [x86_64-linux]

I've tried doing this to update ruby, but still can't get past the ffi error:

gem install rubygems-update -v 2.3.0

Fetching: rubygems-update-2.3.0.gem (100%)
Successfully installed rubygems-update-2.3.0
Parsing documentation for rubygems-update-2.3.0
Installing ri documentation for rubygems-update-2.3.0
1 gem installed

I'm guessing I just need to install the newest Ruby, but it isn't available in the centos yum repos? Is that right?

Thanks,
KB