diff --git a/Casks/firefox-beta.rb b/Casks/firefox-beta.rb
index fb7f7bc58..7fe4616c7 100644
--- a/Casks/firefox-beta.rb
+++ b/Casks/firefox-beta.rb
@@ -1,6 +1,6 @@
 cask :v1 => 'firefox-beta' do
-  version '43.0b5'
-  sha256 '1b56777516b5c9ffbd4169b37acd280e29de75c85b53232e4fc82ec16c514905'
+  version '43.0b6'
+  sha256 '044378b926084c0d91074607f31d04ee7c77ef61ece49f450c059693f9f511f1'
 
   url "https://download.mozilla.org/?product=firefox-#{version}-SSL&os=osx&lang=en-US"
   name 'Firefox'