diff --git a/Gemfile b/Gemfile
index 826cb23..a57b827 100644
--- a/Gemfile
+++ b/Gemfile
@@ -2,4 +2,4 @@ source 'https://rubygems.org'
 
 gemspec
 
-gem "rack", "~> 1.0"
+gem "rack", "~> 2.0.9.1"