diff --git a/Casks/firefox-aurora.rb b/Casks/firefox-aurora.rb
index e2e61a038d1..426160972da 100644
--- a/Casks/firefox-aurora.rb
+++ b/Casks/firefox-aurora.rb
@@ -1,5 +1,5 @@
 class FirefoxAurora < Cask
-  url 'http://ftp.mozilla.org/pub/mozilla.org/firefox/nightly/latest-mozilla-aurora/firefox-17.0a2.en-US.mac.dmg'
+  url 'http://ftp.mozilla.org/pub/mozilla.org/firefox/nightly/latest-mozilla-aurora/firefox-18.0a2.en-US.mac.dmg'
   homepage 'http://www.mozilla.org/en-US/firefox/aurora/'
-  version '17.0a2 (210912)'
+  version '18.0a2'
 end