diff --git a/Casks/m/mockoon.rb b/Casks/m/mockoon.rb
index 82b8b11d8a..10129e7772 100644
--- a/Casks/m/mockoon.rb
+++ b/Casks/m/mockoon.rb
@@ -14,6 +14,7 @@ cask "mockoon" do
   end
 
   auto_updates true
+  depends_on macos: ">= :high_sierra"
 
   app "Mockoon.app"