diff --git a/lib/jetty_rails/jars.rb b/lib/jetty_rails/jars.rb
index 769ed76..27da858 100644
--- a/lib/jetty_rails/jars.rb
+++ b/lib/jetty_rails/jars.rb
@@ -21,7 +21,7 @@ module Thread
     end
   end
 
-  require "jruby-rack-0.9.3"
+  require "jruby-rack-0.9.4"
   module Rack
     include_package "org.jruby.rack"
     include_package "org.jruby.rack.rails"
diff --git a/lib/jruby-rack-0.9.4.jar b/lib/jruby-rack-0.9.4.jar
new file mode 100644
index 0000000..64127db
Binary files /dev/null and b/lib/jruby-rack-0.9.4.jar differ