diff --git a/lib/google_drive/util.rb b/lib/google_drive/util.rb
index 9a445c0..2d5676c 100644
--- a/lib/google_drive/util.rb
+++ b/lib/google_drive/util.rb
@@ -27,6 +27,7 @@ module Util
       '.htm' => 'text/html',
       '.html' => 'text/html',
       '.zip' => 'application/zip',
+      '.epub' => 'application/epub+zip',
       '.swf' => 'application/x-shockwave-flash'
     }.freeze