diff --git a/Casks/firefox-beta-gb.rb b/Casks/firefox-beta-gb.rb
index 3b0b5e0ea..26770ac0f 100644
--- a/Casks/firefox-beta-gb.rb
+++ b/Casks/firefox-beta-gb.rb
@@ -1,7 +1,7 @@
 class FirefoxBetaGb < Cask
-  url 'https://download.mozilla.org/?product=firefox-28.0b9&os=osx&lang=en-GB'
+  url 'https://download.mozilla.org/?product=firefox-29.0b1&os=osx&lang=en-GB'
   homepage 'https://www.mozilla.org/en-GB/firefox/beta/'
-  version '28.0b9'
-  sha256 '02d0354afa08e729b4037ee4bc7669cbc8195041f310a2ab51b12794a0c5ad30'
+  version '29.0b1'
+  sha256 '36f8451e0d65b34275d464fe94ad74b385c09373496203e315e1240230bafd14'
   link 'Firefox.app'
 end