diff --git a/Casks/p/perimeter81.rb b/Casks/p/perimeter81.rb
index e760aa7fff3e4..9893189466e41 100644
--- a/Casks/p/perimeter81.rb
+++ b/Casks/p/perimeter81.rb
@@ -1,7 +1,7 @@
 cask "perimeter81" do
   # NOTE: "81" is not a version number, but an intrinsic part of the product name
-  version "10.4.2.1198"
-  sha256 "fc8f897197c0157067a4e3368a5c6a90a24bf113736afecd3a9be4ceb90b7f11"
+  version "10.5.0.1476"
+  sha256 "62802fd5a8e8bbed4135d52d9c79a95677618aa5fd0274a65f212562f199562f"
 
   url "https://static.perimeter81.com/agents/mac/Perimeter81_#{version}.pkg"
   name "Perimeter 81"
@@ -13,6 +13,8 @@
     regex(/href=.*?Perimeter81[._-]v?(\d+(?:\.\d+)+)\.pkg/i)
   end
 
+  depends_on macos: ">= :big_sur"
+
   pkg "Perimeter81_#{version}.pkg"
 
   uninstall launchctl: [