diff --git a/Casks/s/saoimageds9.rb b/Casks/s/saoimageds9.rb
index f5e506dafa..78602a1c22 100644
--- a/Casks/s/saoimageds9.rb
+++ b/Casks/s/saoimageds9.rb
@@ -41,6 +41,8 @@ cask "saoimageds9" do
     regex(/href=.*?SAOImageDS9%20v?(\d+(?:\.\d+)+)\.dmg/i)
   end
 
+  depends_on macos: ">= :big_sur"
+
   app "SAOImageDS9.app"
 
   zap trash: [