diff --git a/Casks/o/ossapp.rb b/Casks/o/ossapp.rb
index 4200e11dd9..6ffcb3148f 100644
--- a/Casks/o/ossapp.rb
+++ b/Casks/o/ossapp.rb
@@ -17,6 +17,7 @@ cask "ossapp" do
   end
 
   auto_updates true
+  depends_on macos: ">= :big_sur"
 
   app "ossapp.app"