diff --git a/a3p-integration/proposals/a:upgrade-next/exit-reclaim.test.js b/a3p-integration/proposals/a:upgrade-next/exit-reclaim.test.js
index c2bf31a5241..8bc90eca42c 100644
--- a/a3p-integration/proposals/a:upgrade-next/exit-reclaim.test.js
+++ b/a3p-integration/proposals/a:upgrade-next/exit-reclaim.test.js
@@ -3,7 +3,7 @@ import { $ } from 'execa';
 import { execFileSync } from 'node:child_process';
 import { makeAgd, waitForBlock } from './synthetic-chain-excerpt.js';
 
-const offerId = 'bad-invitation-15'; // cf. prepare.sh
+const offerId = 'bad-invitation-16'; // cf. prepare.sh
 const from = 'gov1';
 
 test('exitOffer tool reclaims stuck payment', async t => {
diff --git a/a3p-integration/proposals/a:upgrade-next/initial.test.js b/a3p-integration/proposals/a:upgrade-next/initial.test.js
index 15b12c33697..6649d1c001e 100644
--- a/a3p-integration/proposals/a:upgrade-next/initial.test.js
+++ b/a3p-integration/proposals/a:upgrade-next/initial.test.js
@@ -6,8 +6,6 @@ const vats = {
   network: { incarnation: 0 },
   ibc: { incarnation: 0 },
   localchain: { incarnation: 0 },
-  walletFactory: { incarnation: 3 },
-  zoe: { incarnation: 1 },
 };
 
 test(`vat details`, async t => {
diff --git a/a3p-integration/proposals/a:upgrade-next/package.json b/a3p-integration/proposals/a:upgrade-next/package.json
index 8f70d58186e..128a1e2d216 100644
--- a/a3p-integration/proposals/a:upgrade-next/package.json
+++ b/a3p-integration/proposals/a:upgrade-next/package.json
@@ -6,9 +6,7 @@
     "upgradeInfo": {
       "coreProposals": []
     },
-    "sdk-generate": [
-      "vats/probe-zcf-bundle.js probe-submission"
-    ],
+    "sdk-generate": [],
     "type": "Software Upgrade Proposal"
   },
   "type": "module",
diff --git a/a3p-integration/proposals/a:upgrade-next/prepare.sh b/a3p-integration/proposals/a:upgrade-next/prepare.sh
index febb39d835f..63f333ad514 100755
--- a/a3p-integration/proposals/a:upgrade-next/prepare.sh
+++ b/a3p-integration/proposals/a:upgrade-next/prepare.sh
@@ -20,7 +20,7 @@ printISTBalance gov1
 
 badInvitationOffer=$(mktemp)
 cat > "$badInvitationOffer" << 'EOF'
-{"body":"#{\"method\":\"executeOffer\",\"offer\":{\"id\":\"bad-invitation-15\",\"invitationSpec\":{\"callPipe\":[[\"badMethodName\"]],\"instancePath\":[\"reserve\"],\"source\":\"agoricContract\"},\"proposal\":{\"give\":{\"Collateral\":{\"brand\":\"$0.Alleged: IST brand\",\"value\":\"+15000\"}}}}}","slots":["board0257"]}
+{"body":"#{\"method\":\"executeOffer\",\"offer\":{\"id\":\"bad-invitation-16\",\"invitationSpec\":{\"callPipe\":[[\"badMethodName\"]],\"instancePath\":[\"reserve\"],\"source\":\"agoricContract\"},\"proposal\":{\"give\":{\"Collateral\":{\"brand\":\"$0.Alleged: IST brand\",\"value\":\"+15000\"}}}}}","slots":["board0257"]}
 EOF
 
 PATH=/usr/src/agoric-sdk/node_modules/.bin:$PATH
diff --git a/a3p-integration/proposals/a:upgrade-next/probeZcfBundleCap.test.js b/a3p-integration/proposals/a:upgrade-next/probeZcfBundleCap.test.js
deleted file mode 100644
index ef27a73f649..00000000000
--- a/a3p-integration/proposals/a:upgrade-next/probeZcfBundleCap.test.js
+++ /dev/null
@@ -1,27 +0,0 @@
-import test from 'ava';
-
-import {
-  evalBundles,
-  getIncarnation,
-  getVatDetails,
-} from '@agoric/synthetic-chain';
-
-const SUBMISSION_DIR = 'probe-submission';
-
-test('upgrade Zoe to verify ZcfBundleCap endures', async t => {
-  await null;
-  t.assert((await getIncarnation('zoe')) === 1, 'zoe incarnation must be one');
-
-  // Before the test, the Wallet Factory should be using the legacy ZCF
-  const detailsBefore = await getVatDetails('walletFactory');
-  t.true(detailsBefore.incarnation >= 2, 'wf incarnation must be >= 2');
-
-  await evalBundles(SUBMISSION_DIR);
-
-  const detailsAfter = await getVatDetails('walletFactory');
-  t.is(
-    detailsAfter.incarnation,
-    detailsBefore.incarnation + 2,
-    'wf incarnation must increase by 2',
-  );
-});
diff --git a/golang/cosmos/app/app.go b/golang/cosmos/app/app.go
index 0af37abdb20..6944cc56c63 100644
--- a/golang/cosmos/app/app.go
+++ b/golang/cosmos/app/app.go
@@ -895,11 +895,7 @@ func unreleasedUpgradeHandler(app *GaiaApp, targetUpgrade string) func(sdk.Conte
 			// Each CoreProposalStep runs sequentially, and can be constructed from
 			// one or more modules executing in parallel within the step.
 			CoreProposalSteps = []vm.CoreProposalStep{
-				/* upgrade-15 evals */
-				// Upgrade ZCF only
-				vm.CoreProposalStepForModules("@agoric/builders/scripts/vats/upgrade-zcf.js"),
-				// Upgrade walletFactory
-				vm.CoreProposalStepForModules("@agoric/builders/scripts/smart-wallet/build-wallet-factory2-upgrade.js"),
+				/* upgrade-16 evals */
 				// upgrade the provisioning vat
 				vm.CoreProposalStepForModules("@agoric/builders/scripts/vats/replace-provisioning.js"),
 				// Enable low-level Orchestration.
@@ -915,11 +911,11 @@ func unreleasedUpgradeHandler(app *GaiaApp, targetUpgrade string) func(sdk.Conte
 					"@agoric/builders/scripts/vats/updateStTiaPriceFeed.js",
 				),
 				// Add new auction contract. The old one will be retired shortly.
-				vm.CoreProposalStepForModules( "@agoric/builders/scripts/vats/add-auction.js"),
+				vm.CoreProposalStepForModules("@agoric/builders/scripts/vats/add-auction.js"),
 				// upgrade vaultFactory.
-				vm.CoreProposalStepForModules( "@agoric/builders/scripts/vats/upgradeVaults.js"),
+				vm.CoreProposalStepForModules("@agoric/builders/scripts/vats/upgradeVaults.js"),
 				// upgrade scaledPriceAuthorities.
-				vm.CoreProposalStepForModules( "@agoric/builders/scripts/vats/upgradeScaledPriceAuthorities.js"),
+				vm.CoreProposalStepForModules("@agoric/builders/scripts/vats/upgradeScaledPriceAuthorities.js"),
 			}
 		}