You have two options:
Write your Ruby version to a file called .ruby-version
in the root of your git repo
echo "2.6.3 > .ruby-version"
git add .ruby-version
git commit -m "Set ruby version"
Or you can manage it in your Gemfile
ruby "2.6.3"
bundle
git add Gemfile Gemfile.lock
git commit -m "Set ruby version"
For legacy versions of Ruby, we only support the latest patch versions.
Here's a list of supported Ruby versions that are currently supported:
3.0.0
2.7.2
2.7.1
2.7.0
2.6.6
2.6.5
2.6.4
2.6.3
2.6.2
2.6.1
2.6.0
2.5.8
2.5.7
2.5.6
2.5.5
2.5.4
2.5.3
2.5.1
2.5.0
2.4.10
2.4.9
2.4.8
2.4.7
2.4.6
2.4.5
2.4.4
2.4.3
2.4.2
2.4.1
2.4.0
2.3.8
2.3.7
2.3.6
2.3.5
2.3.4
2.3.3
2.3.2
2.3.1
2.3.0
2.2.10
2.2.9
2.2.8
2.2.7
2.2.6
2.0.0
1.9.3
1.8.7