diff --git a/Gemfile b/Gemfile
index cfe43f76c..9e8d45218 100644
--- a/Gemfile
+++ b/Gemfile
@@ -2,5 +2,5 @@ source 'https://rubygems.org'
 
 gem 'aruba', '~> 0.5.3'
 gem 'cucumber', '~> 1.3.9'
-gem 'sinatra'
+gem 'sinatra', '>= 2.2.3'
 gem 'ronn'