diff --git a/Casks/thunderbird-ja.rb b/Casks/thunderbird-ja.rb
index be01c5417..1010dfe15 100644
--- a/Casks/thunderbird-ja.rb
+++ b/Casks/thunderbird-ja.rb
@@ -2,6 +2,6 @@ class ThunderbirdJa < Cask
   url 'http://download-installer.cdn.mozilla.net/pub/thunderbird/releases/24.2.0/mac/ja-JP-mac/Thunderbird%2024.2.0.dmg'
   homepage 'http://www.mozilla.jp/thunderbird/'
   version '24.2.0'
-  sha1 'aeb874de260df0cfb0cec06d24d9fc3baf343059'
+  sha256 'a3e4d03924ee555865b90bb95f8043811e15bfd20358e5b265b5b1cfc4812b7d'
   link 'Thunderbird.app'
 end