diff --git a/Gemfile b/Gemfile
index 80375b2..949eb9f 100644
--- a/Gemfile
+++ b/Gemfile
@@ -2,7 +2,7 @@ source "http://rubygems.org"
 
 group :development do
   gem 'rake', '13.2.1'
-  gem 'rack', '3.2.4'
+  gem 'rack', '2.2.23'
   gem 'jekyll', '4.4.1'
   gem 'rdiscount', '2.2.7.3'
   gem 'pygments.rb', '3.0.0'