diff --git a/Casks/thunderbird.rb b/Casks/thunderbird.rb
index 0e2c0199241..f0f04bb2579 100644
--- a/Casks/thunderbird.rb
+++ b/Casks/thunderbird.rb
@@ -1,8 +1,8 @@
 class Thunderbird < Cask
-  version '31.1.0'
-  sha256 'bd092195ee77c6450764c39936fb74f3062a941b375f728c7fac22a9a284580e'
+  version '31.1.1'
+  sha256 '1cccb367aefb95912fdc735a87095e728668ef269047e4813812b469431b2e57'
 
-  url 'https://download.mozilla.org/?product=thunderbird-31.1.0&os=osx&lang=en-US'
+  url "https://download.mozilla.org/?product=thunderbird-#{version}&os=osx&lang=en-US"
   homepage 'http://www.mozilla.org/en-US/thunderbird/'
 
   link 'Thunderbird.app'