diff --git a/Casks/thunderbird-beta.rb b/Casks/thunderbird-beta.rb
index 42d7abe4d..62fce559c 100644
--- a/Casks/thunderbird-beta.rb
+++ b/Casks/thunderbird-beta.rb
@@ -1,6 +1,6 @@
 cask :v1 => 'thunderbird-beta' do
-  version '34.0b1'
-  sha256 '7f6025c689633e893203490f11504b4790c46eca88393d7ab678b5405b8a8acb'
+  version '37.0b1'
+  sha256 'a035e47ea01639df6f5fe05e7e115814fcca04005ef329a06968e4ab86c354e7'
 
   url "https://download-installer.cdn.mozilla.net/pub/thunderbird/releases/#{version}/mac/en-US/Thunderbird%20#{version}.dmg"
   homepage 'https://www.mozilla.org/en-US/thunderbird/all-beta.html'