diff --git a/Casks/firefox.rb b/Casks/firefox.rb
index 7e4dc611a..316458ff4 100644
--- a/Casks/firefox.rb
+++ b/Casks/firefox.rb
@@ -1,5 +1,5 @@
 class Firefox < Cask
-  url 'http://releases.mozilla.org/pub/mozilla.org/firefox/releases/11.0/mac/en-US/Firefox%2011.0.dmg'
+  url 'http://releases.mozilla.org/pub/mozilla.org/firefox/releases/15.0.1/mac/en-US/Firefox%2015.0.1.dmg'
   homepage 'http://www.mozilla.org/en-US/firefox/'
-  version '11.0'
+  version '15.0.1'
 end