ruby-build: definition not found: 2.2.1

I want to install new version of ruby by rbenv install 2.2.1, but I get the error

ruby-build: definition not found: 2.2.1 The following versions contain 2.2.1 in the name: rbx-2.2.1 rbx-2.2.10 

Could you please let me know how should I install version 2.2.1?

Thanks in advance!

6 Answers

You should upgrade ruby-build to the latest version, ruby-build is an rbenv plugin that provides an rbenv install command to compile and install different versions of Ruby on UNIX-like systems.

Using Homebrew package manager:

brew upgrade ruby-build --HEAD 

If ruby-build-HEAD already installed try reinstalling it

brew reinstall ruby-build --HEAD 

You can look for the current stable ruby version number at:

Then use rbenv to see the upgraded list of available options:

rbenv install --list 

Install latest stable version as below (replace 2.2.2 with your version string):

rbenv install 2.2.2 rbenv rehash 

To list and verify all installed versions:

rbenv versions 

To set as the global ruby version (in this case 2.2.2):

rbenv global 2.2.2 

Hope this helps you and everyone else who faces similar situation in future.

Most of the answer here use brew command. So in case, you are on Ubuntu, then do these.

cd ~/.rbenv git pull cd ~/.rbenv/plugins/ruby-build/ git pull 

Just in case anyone else runs into this issue using the asdf package manager, simply update your plugins by running:

asdf plugin update --all

This will make sure you are on the latest version of ruby-build

Try to update your ruby-build manually from the repository by using this command:

/Users/your-user/.rbenv/plugins/ruby-build && git pull 

Replace "your-user" with your Mac User

Once you've done that you can run the install:

rbenv install 2.2.1 

The easiest way if you're using Linux and have git installed:

git -C ~/.rbenv/plugins/ruby-build pull

I upgraded homebrew

brew update && brew upgrade 

and then was able to upgrade to 2.2.1

rbenv install '2.2.1' 

Hope this helps!