diff --git a/Casks/serial.rb b/Casks/serial.rb
index 561fef682a..bfb11dfa39 100644
--- a/Casks/serial.rb
+++ b/Casks/serial.rb
@@ -3,7 +3,7 @@ cask 'serial' do
   sha256 'fb029f58a45d59bc6bf99ca2fd6d75a62b017840e7d28f63432fe8379a19421d'
 
   url "https://www.decisivetactics.com/products/serial/dl/Serial_#{version}.zip"
-  appcast 'https://www.decisivetactics.com/products/serial/appcast'
+  appcast 'https://www.decisivetactics.com/api/checkupdate?x-app_id=com.decisivetactics.serial.direct'
   name 'Serial'
   homepage 'https://www.decisivetactics.com/products/serial/'