diff --git a/Casks/m/millie.rb b/Casks/m/millie.rb
index 303ecab58def..f9621122be39 100644
--- a/Casks/m/millie.rb
+++ b/Casks/m/millie.rb
@@ -8,8 +8,8 @@
   homepage "https://www.millie.co.kr/"
 
   livecheck do
-    url :url
-    strategy :extract_plist
+    url "https://install.millie.co.kr/flutter/#{version}/appcast.xml"
+    regex(/Version\s(\d+(?:\.\d+)+)/i)
   end
 
   depends_on macos: ">= :big_sur"