(These examples are from a MacOS machine).

ruby-version is read automatically, and you’re automatically switched to the correct version of Ruby before you start working.įor example, you might have this sequence: % cd ~/projects/older-project It is very convenient because it hooks into the cd ( change directory) command. I highly recommend using a Ruby version manager because it allows you to have multiple versions of Ruby installed at the same time, and makes it easy to switch between them. 2) Install the new version with Homebrew (not recommended) 1. RVM is typically installed ( link) on a Linux, Unix or MacOS machine. 1) Install the new version with a Ruby version manager (recommended) or. Popular tools to help you manage your Ruby version are: ruby-version file, which simply specifies a version number, for example: 2.4.2 Many Ruby (or Rails) projects will include a simple. There are a couple of tools which are popular for this, but both have agreed to share a common file. This makes it much easier to manage multiple projects on your development machine, each expecting a different version of Ruby. If you don’t specify which version of Ruby your project needs, it can be very confusing when code works on one machine, but not another.Īs with most languages, it’s considered good practice to specify the version of Ruby that your code expects. This means that your project now also relies on Ruby 1.9 features. How does this cause problems?įor example, you might have decided to use a Gem which internally relies on Ruby 1.9 features. This older code will run on any version, but the newer syntax will only run on Ruby 1.9+. What does rbenv gemset list give you Plus can I recommend using rvm instead of rbenv, its much simpler if using rvm Id just switch rvm use 2.5.5 would sort you out, but the equivalen rbenv solution is rbenv local 2.5. Probably the most visible change came with Ruby 1.9. This will likely be related to your gemset.

This means that it is important to be clear about which Ruby version your code expects. And like many languages, there have been syntax changes across versions. Ruby has been in constant development since the 1990s.

Mac switch ruby versions