diff --git a/nix/darwin.nix b/nix/darwin.nix
index 7f1d057..9619083 100644
--- a/nix/darwin.nix
+++ b/nix/darwin.nix
@@ -204,6 +204,7 @@
     masApps = {
       Numbers = 409203825;
       Pages = 409201541;
+      Tampermonkey = 6738342400;
       Things3 = 904280696;
     };
   };