Upgrade Ruby version with Mise

Written by Indigo Tech Tutorials

August 14, 2025

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Ruby 3.4.5 was released last month but I had been using 3.4.4 still and now Rails 8.0.2.1 was just released so I decided I would finally do the upgrade process. I am using mise as my ruby manager so these were the steps I took to install the new version of ruby and upgrade my global version. First of all I installed the new version of Ruby with mise

mise install ruby 3.4.5

This usually takes a few minutes to download and get setup. After this installation step completed. You can set the global version of Ruby using this command

mise use --global ruby@3.4.5

Now you should be able to check your ruby version and confirm that it is using 3.4.5

ruby -v

Then you will also want to install the Rails gem again for this new version of Ruby.

gem install rails

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