diff --git a/Casks/ammonite.rb b/Casks/ammonite.rb
index 7544efcb16..a95c58473a 100644
--- a/Casks/ammonite.rb
+++ b/Casks/ammonite.rb
@@ -3,7 +3,7 @@ cask 'ammonite' do
   sha256 '1f8b34ef2f57305f85acfe09feab85049ca8e77c812182eee9061d478b65e877'
 
   url "https://www.soma-zone.com/download/files/Ammonite-#{version}.tar.bz2"
-  appcast 'https://www.soma-zone.com/Ammonite/a/appcast.xml'
+  appcast 'https://www.soma-zone.com/Ammonite/a/appcast_update.xml'
   name 'Ammonite'
   homepage 'https://www.soma-zone.com/Ammonite/'