diff --git a/packages/SwingSet/src/controller.js b/packages/SwingSet/src/controller.js
index f14eea28caf..653061c19ee 100644
--- a/packages/SwingSet/src/controller.js
+++ b/packages/SwingSet/src/controller.js
@@ -18,6 +18,7 @@ import { makeMeteringTransformer } from '@agoric/transform-metering';
 import { makeTransform } from '@agoric/transform-eventual-send';
 import { locateWorkerBin } from '@agoric/xs-vat-worker';
 
+import { WeakRef, FinalizationRegistry } from './weakref';
 import { startSubprocessWorker } from './spawnSubprocessWorker';
 import { waitUntilQuiescent } from './waitUntilQuiescent';
 import { insistStorageAPI } from './storageAPI';
@@ -183,6 +184,8 @@ export async function makeSwingsetController(
     startSubprocessWorkerNode,
     startSubprocessWorkerXS,
     writeSlogObject,
+    WeakRef,
+    FinalizationRegistry,
   };
 
   const kernelOptions = { verbose };
diff --git a/packages/SwingSet/src/kernel/kernel.js b/packages/SwingSet/src/kernel/kernel.js
index 536280dc4f4..97e427382bd 100644
--- a/packages/SwingSet/src/kernel/kernel.js
+++ b/packages/SwingSet/src/kernel/kernel.js
@@ -99,6 +99,8 @@ export default function buildKernel(
     startSubprocessWorkerNode,
     startSubprocessWorkerXS,
     writeSlogObject,
+    WeakRef,
+    FinalizationRegistry,
   } = kernelEndowments;
   deviceEndowments = { ...deviceEndowments }; // copy so we can modify
   const { verbose } = kernelOptions;
@@ -529,6 +531,7 @@ export default function buildKernel(
     }
   }
 
+  const gcTools = harden({ WeakRef, FinalizationRegistry });
   const vatManagerFactory = makeVatManagerFactory({
     allVatPowers,
     kernelKeeper,
@@ -540,6 +543,7 @@ export default function buildKernel(
     makeNodeWorker,
     startSubprocessWorkerNode,
     startSubprocessWorkerXS,
+    gcTools,
   });
 
   function buildVatSyscallHandler(vatID, translators) {
diff --git a/packages/SwingSet/src/kernel/vatManager/factory.js b/packages/SwingSet/src/kernel/vatManager/factory.js
index 8e6bbdf7714..fa4a207e9fb 100644
--- a/packages/SwingSet/src/kernel/vatManager/factory.js
+++ b/packages/SwingSet/src/kernel/vatManager/factory.js
@@ -14,6 +14,7 @@ export function makeVatManagerFactory({
   makeNodeWorker,
   startSubprocessWorkerNode,
   startSubprocessWorkerXS,
+  gcTools,
 }) {
   const localFactory = makeLocalVatManagerFactory({
     allVatPowers,
@@ -22,6 +23,7 @@ export function makeVatManagerFactory({
     meterManager,
     transformMetering,
     waitUntilQuiescent,
+    gcTools,
   });
 
   const nodeWorkerFactory = makeNodeWorkerVatManagerFactory({
diff --git a/packages/SwingSet/src/kernel/vatManager/localVatManager.js b/packages/SwingSet/src/kernel/vatManager/localVatManager.js
index dd53bfe7726..8434470bf0a 100644
--- a/packages/SwingSet/src/kernel/vatManager/localVatManager.js
+++ b/packages/SwingSet/src/kernel/vatManager/localVatManager.js
@@ -13,6 +13,7 @@ export function makeLocalVatManagerFactory(tools) {
     meterManager,
     transformMetering,
     waitUntilQuiescent,
+    gcTools,
   } = tools;
 
   const { makeGetMeter, refillAllMeters, stopGlobalMeter } = meterManager;
@@ -107,7 +108,7 @@ export function makeLocalVatManagerFactory(tools) {
 
     // we might or might not use this, depending upon whether the vat exports
     // 'buildRootObject' or a default 'setup' function
-    const ls = makeLiveSlots(syscall, vatID, vatPowers, vatParameters);
+    const ls = makeLiveSlots(syscall, vatID, vatPowers, vatParameters, gcTools);
 
     let meterRecord = null;
     if (metered) {
diff --git a/packages/SwingSet/src/kernel/vatManager/nodeWorkerSupervisor.js b/packages/SwingSet/src/kernel/vatManager/nodeWorkerSupervisor.js
index 9561e88410c..d4503b6a19f 100644
--- a/packages/SwingSet/src/kernel/vatManager/nodeWorkerSupervisor.js
+++ b/packages/SwingSet/src/kernel/vatManager/nodeWorkerSupervisor.js
@@ -7,6 +7,7 @@ import anylogger from 'anylogger';
 import { assert } from '@agoric/assert';
 import { importBundle } from '@agoric/import-bundle';
 import { Remotable, getInterfaceOf, makeMarshal } from '@agoric/marshal';
+import { WeakRef, FinalizationRegistry } from '../../weakref';
 import { waitUntilQuiescent } from '../../waitUntilQuiescent';
 import { makeLiveSlots } from '../liveSlots';
 
@@ -113,7 +114,8 @@ parentPort.on('message', ([type, ...margs]) => {
       makeMarshal,
       testLog,
     };
-    const ls = makeLiveSlots(syscall, vatID, vatPowers, vatParameters);
+    const gcTools = harden({ WeakRef, FinalizationRegistry });
+    const ls = makeLiveSlots(syscall, vatID, vatPowers, vatParameters, gcTools);
 
     const endowments = {
       ...ls.vatGlobals,
diff --git a/packages/SwingSet/src/kernel/vatManager/subprocessSupervisor.js b/packages/SwingSet/src/kernel/vatManager/subprocessSupervisor.js
index 40621ec5e2f..e7d788719fd 100644
--- a/packages/SwingSet/src/kernel/vatManager/subprocessSupervisor.js
+++ b/packages/SwingSet/src/kernel/vatManager/subprocessSupervisor.js
@@ -7,6 +7,7 @@ import fs from 'fs';
 import { assert } from '@agoric/assert';
 import { importBundle } from '@agoric/import-bundle';
 import { Remotable, getInterfaceOf, makeMarshal } from '@agoric/marshal';
+import { WeakRef, FinalizationRegistry } from '../../weakref';
 import { arrayEncoderStream, arrayDecoderStream } from '../../worker-protocol';
 import {
   netstringEncoderStream,
@@ -133,7 +134,8 @@ fromParent.on('data', ([type, ...margs]) => {
       makeMarshal,
       testLog,
     };
-    const ls = makeLiveSlots(syscall, vatID, vatPowers, vatParameters);
+    const gcTools = harden({ WeakRef, FinalizationRegistry });
+    const ls = makeLiveSlots(syscall, vatID, vatPowers, vatParameters, gcTools);
 
     const endowments = {
       ...ls.vatGlobals,
diff --git a/packages/SwingSet/test/test-kernel.js b/packages/SwingSet/test/test-kernel.js
index dfc7322df25..2bec7a73110 100644
--- a/packages/SwingSet/test/test-kernel.js
+++ b/packages/SwingSet/test/test-kernel.js
@@ -2,6 +2,7 @@ import '@agoric/install-ses';
 import test from 'ava';
 import anylogger from 'anylogger';
 import { initSwingStore } from '@agoric/swing-store-simple';
+import { WeakRef, FinalizationRegistry } from '../src/weakref';
 import { waitUntilQuiescent } from '../src/waitUntilQuiescent';
 
 import buildKernel from '../src/kernel/index';
@@ -49,6 +50,8 @@ function makeEndowments() {
     hostStorage: initSwingStore().storage,
     runEndOfCrank: () => {},
     makeConsole,
+    WeakRef,
+    FinalizationRegistry,
   };
 }
 
diff --git a/packages/SwingSet/test/test-liveslots.js b/packages/SwingSet/test/test-liveslots.js
index 71c62c7ba7c..1eee852a10d 100644
--- a/packages/SwingSet/test/test-liveslots.js
+++ b/packages/SwingSet/test/test-liveslots.js
@@ -1,6 +1,7 @@
 import '@agoric/install-ses';
 import test from 'ava';
 import { E } from '@agoric/eventual-send';
+import { WeakRef, FinalizationRegistry } from '../src/weakref';
 import { waitUntilQuiescent } from '../src/waitUntilQuiescent';
 import { makeLiveSlots } from '../src/kernel/liveSlots';
 
@@ -37,7 +38,14 @@ function buildSyscall() {
 }
 
 function makeDispatch(syscall, build) {
-  const { setBuildRootObject, dispatch } = makeLiveSlots(syscall, 'vatA');
+  const gcTools = harden({ WeakRef, FinalizationRegistry });
+  const { setBuildRootObject, dispatch } = makeLiveSlots(
+    syscall,
+    'vatA',
+    {},
+    {},
+    gcTools,
+  );
   setBuildRootObject(build);
   return dispatch;
 }
diff --git a/packages/SwingSet/test/test-marshal.js b/packages/SwingSet/test/test-marshal.js
index d6dd9d58b93..4a99dc292a0 100644
--- a/packages/SwingSet/test/test-marshal.js
+++ b/packages/SwingSet/test/test-marshal.js
@@ -2,10 +2,13 @@ import '@agoric/install-ses';
 import test from 'ava';
 import { makePromiseKit } from '@agoric/promise-kit';
 
+import { WeakRef, FinalizationRegistry } from '../src/weakref';
 import { makeMarshaller } from '../src/kernel/liveSlots';
 
 import { buildVatController } from '../src/index';
 
+const gcTools = harden({ WeakRef, FinalizationRegistry });
+
 async function prep() {
   const config = {};
   const controller = await buildVatController(config);
@@ -13,7 +16,7 @@ async function prep() {
 }
 
 test('serialize exports', t => {
-  const { m } = makeMarshaller();
+  const { m } = makeMarshaller(undefined, gcTools);
   const ser = val => m.serialize(val);
   const o1 = harden({});
   const o2 = harden({
@@ -38,7 +41,7 @@ test('serialize exports', t => {
 
 test('deserialize imports', async t => {
   await prep();
-  const { m } = makeMarshaller();
+  const { m } = makeMarshaller(undefined, gcTools);
   const a = m.unserialize({
     body: '{"@qclass":"slot","index":0}',
     slots: ['o-1'],
@@ -63,7 +66,7 @@ test('deserialize imports', async t => {
 });
 
 test('deserialize exports', t => {
-  const { m } = makeMarshaller();
+  const { m } = makeMarshaller(undefined, gcTools);
   const o1 = harden({});
   m.serialize(o1); // allocates slot=1
   const a = m.unserialize({
@@ -75,7 +78,7 @@ test('deserialize exports', t => {
 
 test('serialize imports', async t => {
   await prep();
-  const { m } = makeMarshaller();
+  const { m } = makeMarshaller(undefined, gcTools);
   const a = m.unserialize({
     body: '{"@qclass":"slot","index":0}',
     slots: ['o-1'],
@@ -94,7 +97,7 @@ test('serialize promise', async t => {
     },
   };
 
-  const { m } = makeMarshaller(syscall);
+  const { m } = makeMarshaller(syscall, gcTools);
   const { promise, resolve } = makePromiseKit();
   t.deepEqual(m.serialize(promise), {
     body: '{"@qclass":"slot","index":0}',
@@ -130,7 +133,7 @@ test('unserialize promise', async t => {
     },
   };
 
-  const { m } = makeMarshaller(syscall);
+  const { m } = makeMarshaller(syscall, gcTools);
   const p = m.unserialize({
     body: '{"@qclass":"slot","index":0}',
     slots: ['p-1'],
diff --git a/packages/SwingSet/test/test-vpid-kernel.js b/packages/SwingSet/test/test-vpid-kernel.js
index 0a47846d56a..fac2c5b0640 100644
--- a/packages/SwingSet/test/test-vpid-kernel.js
+++ b/packages/SwingSet/test/test-vpid-kernel.js
@@ -1,9 +1,8 @@
-// eslint-disable-next-line no-redeclare
-
 import '@agoric/install-ses';
 import test from 'ava';
 import anylogger from 'anylogger';
 import { initSwingStore } from '@agoric/swing-store-simple';
+import { WeakRef, FinalizationRegistry } from '../src/weakref';
 import { waitUntilQuiescent } from '../src/waitUntilQuiescent';
 
 import buildKernel from '../src/kernel/index';
@@ -36,6 +35,8 @@ function makeEndowments() {
     hostStorage: initSwingStore().storage,
     runEndOfCrank: () => {},
     makeConsole,
+    WeakRef,
+    FinalizationRegistry,
   };
 }
 
diff --git a/packages/SwingSet/test/test-vpid-liveslots.js b/packages/SwingSet/test/test-vpid-liveslots.js
index e3758088e10..4133a75995b 100644
--- a/packages/SwingSet/test/test-vpid-liveslots.js
+++ b/packages/SwingSet/test/test-vpid-liveslots.js
@@ -6,6 +6,7 @@ import test from 'ava';
 
 import { E } from '@agoric/eventual-send';
 import { makePromiseKit } from '@agoric/promise-kit';
+import { WeakRef, FinalizationRegistry } from '../src/weakref';
 import { makeLiveSlots } from '../src/kernel/liveSlots';
 
 const RETIRE_VPIDS = true;
@@ -190,7 +191,14 @@ function resolutionOf(vpid, mode, targets) {
 }
 
 function makeDispatch(syscall, build) {
-  const { setBuildRootObject, dispatch } = makeLiveSlots(syscall, 'vatA');
+  const gcTools = harden({ WeakRef, FinalizationRegistry });
+  const { setBuildRootObject, dispatch } = makeLiveSlots(
+    syscall,
+    'vatA',
+    {},
+    {},
+    gcTools,
+  );
   setBuildRootObject(build);
   return dispatch;
 }