diff --git a/packages/ses/src/permits.js b/packages/ses/src/permits.js
index 283d861c34..6c79bd435c 100644
--- a/packages/ses/src/permits.js
+++ b/packages/ses/src/permits.js
@@ -488,6 +488,9 @@ export const permitted = {
     groupBy: fn,
     // Seen on QuickJS
     __getClass: false,
+    // https://github.com/endojs/endo/pull/2673
+    isNoTrapping: fn,
+    suppressTrapping: fn,
   },
 
   '%ObjectPrototype%': {
@@ -1624,12 +1627,17 @@ export const permitted = {
     set: fn,
     setPrototypeOf: fn,
     '@@toStringTag': 'string',
+    // https://github.com/endojs/endo/pull/2673
+    isNoTrapping: fn,
+    suppressTrapping: fn,
   },
 
   Proxy: {
     // Properties of the Proxy Constructor
     '[[Proto]]': '%FunctionPrototype%',
     revocable: fn,
+    // https://github.com/endojs/endo/pull/2673
+    prototype: 'undefined',
   },
 
   // Appendix B