I actually came up with a workaround, that may not be the best idea, but for my situation, it was sufficiently viable.
I was relying on a limited number of Compass functions for my project, and I just removed the Compass gem altogether and manually called those relevant Compass files (downloaded off the github repo) instead. I also used Autoprefixr for vendor prefixing purposes.
I understand that for people who use a large range of compass functions this may not be viable. But this workaround allowed me to use the latest version of SASS, which was more important to me than Compass, to be honest.