Recent releases of Bundler makes even more simple to load Bundler.

No need to take care of caching or pre-cached bundles anymore.

config.ru

@@ -1,15 +1,8 @@
 
 # bundler
 
-begin
-  # try to require the preresolved locked set of gems.
-  require ::File.expand_path('.bundle/environment', __FILE__)
-rescue LoadError
-  # fall back on doing an unlocked resolve at runtime.
-  require 'rubygems'
-  require 'bundler'
-  Bundler.setup(:default)
-end
+require 'rubygems'
+require 'bundler/setup'
 
 
 # json