How to Install an Older Version of Rails (2018)

You can install an older version of rails using this syntax:

rails _5.1.6_ new my-test-app

(Where “5.1.6” is the version you want and “my-test-app” is the name of your new rails app.)

Yes, you actually type those underscores around the version number.

If you get …

can’t find gem railties (>= 0.a) (Gem::GemNotFoundException)

You probably don’t have the right version of Rails itself installed as a gem; try this:

rails install -v=5.1.6

or…

gem install rails -v 5.1.6

Then try again with…

rails _5.1.6_ new my-test-app

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