diff --git a/Gemfile b/Gemfile
index 7a68f5a8817..cbedd367ca4 100644
--- a/Gemfile
+++ b/Gemfile
@@ -1,4 +1,5 @@
 source "https://rubygems.org"
 
 # gem "github-pages", group: :jekyll_plugins
+gem 'eventmachine', '1.2.7', git: 'https://github.com/eventmachine/eventmachine.git', tag: 'v1.2.7'
 gemspec