'Bundler `materialize': Could not find unicode-display_width-1.8.0 in any of the sources

I've ran a bundle update in my Jekyll project, which is running 4.2.0 but when I deploy to my server I get:

`materialize': Could not find unicode-display_width-1.8.0 in any of the sources

I ran a gem update on my server which successfully updates a bunch of packages, how can I resolve this error.



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