diff --git a/lib/tdiary/rack/static.rb b/lib/tdiary/rack/static.rb
index 4f305c29..1ecabea7 100644
--- a/lib/tdiary/rack/static.rb
+++ b/lib/tdiary/rack/static.rb
@@ -1,4 +1,4 @@
-require 'rack/file'
+require 'rack/files'
 
 module TDiary
 	module Rack