CONTRIBUTING.md in google-cloud-bigquery-1.28.0 vs CONTRIBUTING.md in google-cloud-bigquery-1.29.0

@@ -22,10 +22,10 @@
 ## Setup
 
 In order to use the google-cloud-bigquery console and run the project's tests,
 there is a small amount of setup:
 
-1. Install Ruby. google-cloud-bigquery requires Ruby 2.4+. You may choose to
+1. Install Ruby. google-cloud-bigquery requires Ruby 2.5+. You may choose to
    manage your Ruby and gem installations with [RVM](https://rvm.io/),
    [rbenv](https://github.com/rbenv/rbenv), or
    [chruby](https://github.com/postmodern/chruby).
 
 2. Install [Bundler](http://bundler.io/).