diff --git a/Gemfile b/Gemfile
index 96fc0dfc8..b1ecd1fd6 100644
--- a/Gemfile
+++ b/Gemfile
@@ -13,7 +13,7 @@ end
 
 gem "eventmachine", "1.0.3"
 gem "thin"
-gem "sinatra", "1.3.2"
+gem "sinatra", "1.4.2"
 gem "em-websocket", "~> 0.3.6"
 gem "jsmin", "~> 1.0.1"
 gem "ansi"