diff --git a/docs/Gemfile b/docs/Gemfile
index fb73b27fc..d8becf976 100644
--- a/docs/Gemfile
+++ b/docs/Gemfile
@@ -1,3 +1,3 @@
 source "https://rubygems.org"
 gem 'github-pages', group: :jekyll_plugins
-ruby '~> 3.0.0'
+ruby '~> 2.7.0'