diff --git a/Gemfile b/Gemfile
index 13ce910..c2e8c6e 100755
--- a/Gemfile
+++ b/Gemfile
@@ -5,4 +5,5 @@ gemspec
 group :development do
   gem "rdoc"
   gem "bundler"
+  gem "rack", "< 2.0"
 end