diff --git a/Gemfile b/Gemfile
index eaaf55a..69fa66e 100644
--- a/Gemfile
+++ b/Gemfile
@@ -1,6 +1,6 @@
 source :rubygems
 
-gem "sinatra"
+gem "sinatra", ">= 4.1.0"
 gem "haml"
 gem "httparty"
 gem "actionpack"