diff --git a/changelog/25272.txt b/changelog/25272.txt
new file mode 100644
index 0000000000..77006057bf
--- /dev/null
+++ b/changelog/25272.txt
@@ -0,0 +1,3 @@
+```release-note:change
+ui: Upgrade Ember data from 4.11.3 to 4.12.4
+```
\ No newline at end of file
diff --git a/ui/app/serializers/secret.js b/ui/app/serializers/secret.js
index dd31bfab93..821bafe685 100644
--- a/ui/app/serializers/secret.js
+++ b/ui/app/serializers/secret.js
@@ -37,9 +37,8 @@ export default ApplicationSerializer.extend({
     // to `secret_data` so it will be `secretData` in the model
     payload.secret_data = get(payload, path);
     delete payload[path];
-    // return the payload if it's expecting a single object or wrap
-    // it as an array if not
-    return requestType === 'queryRecord' ? payload : [payload];
+
+    return payload;
   },
 
   serialize(snapshot) {
diff --git a/ui/app/services/store.js b/ui/app/services/store.js
index c2bc4fd713..3662614e21 100644
--- a/ui/app/services/store.js
+++ b/ui/app/services/store.js
@@ -3,7 +3,9 @@
  * SPDX-License-Identifier: BUSL-1.1
  */
 
-import Store from '@ember-data/store';
+import Store, { CacheHandler } from '@ember-data/store';
+import RequestManager from '@ember-data/request';
+import { LegacyNetworkHandler } from '@ember-data/legacy-compat';
 import { run, schedule } from '@ember/runloop';
 import { resolve, Promise } from 'rsvp';
 import { dasherize } from '@ember/string';
@@ -33,6 +35,16 @@ export function keyForCache(query) {
 }
 
 export default class StoreService extends Store {
+  requestManager = new RequestManager();
+
+  constructor(args) {
+    super(args);
+    // If at some point we no longer need an extended store, we can remove the @ember-data/legacy-compat dep
+    // See: https://api.emberjs.com/ember-data/4.12/modules/@ember-data%2Frequest
+    this.requestManager.use([LegacyNetworkHandler]);
+    this.requestManager.useCache(CacheHandler);
+  }
+
   lazyCaches = new Map();
 
   setLazyCacheForModel(modelName, key, value) {
diff --git a/ui/mirage/handlers/sync.js b/ui/mirage/handlers/sync.js
index cc1d29469f..eba258f42a 100644
--- a/ui/mirage/handlers/sync.js
+++ b/ui/mirage/handlers/sync.js
@@ -75,8 +75,15 @@ const createOrUpdateDestination = (schema, req) => {
     }
   }
   const data = { ...apiResponse, type, name };
-  schema.db.syncDestinations.firstOrCreate({ type, name }, data);
-  return schema.db.syncDestinations.update({ type, name }, data);
+  // issue with mirages' update method not returning an id on the payload which causes ember data to error after 4.12.x upgrade.
+  // to work around this, determine if we're creating or updating a record first
+  const records = schema.db.syncDestinations.where({ type, name });
+
+  if (!records.length) {
+    return schema.db.syncDestinations.firstOrCreate({ type, name }, data);
+  } else {
+    return schema.db.syncDestinations.update({ type, name }, data);
+  }
 };
 
 export default function (server) {
diff --git a/ui/package.json b/ui/package.json
index 7acfd205b3..c3a68ebcab 100644
--- a/ui/package.json
+++ b/ui/package.json
@@ -59,6 +59,7 @@
     "@babel/plugin-proposal-decorators": "^7.21.0",
     "@babel/plugin-proposal-object-rest-spread": "^7.12.1",
     "@babel/plugin-transform-block-scoping": "^7.12.1",
+    "@ember-data/legacy-compat": "~4.12.4",
     "@ember/legacy-built-in-components": "^0.4.1",
     "@ember/optional-features": "^2.0.0",
     "@ember/render-modifiers": "^1.0.2",
@@ -145,7 +146,7 @@
     "ember-concurrency": "2.3.4",
     "ember-copy": "2.0.1",
     "ember-d3": "^0.5.1",
-    "ember-data": "~4.11.3",
+    "ember-data": "~4.12.4",
     "ember-engines": "0.8.23",
     "ember-exam": "^9.0.0",
     "ember-fetch": "^8.1.2",
diff --git a/ui/tests/acceptance/auth-test.js b/ui/tests/acceptance/auth-test.js
index 30bdc6528b..ab48fe5d33 100644
--- a/ui/tests/acceptance/auth-test.js
+++ b/ui/tests/acceptance/auth-test.js
@@ -75,7 +75,7 @@ module('Acceptance | auth', function (hooks) {
       let included;
       if (backend.type === 'token') {
         keys = lastRequest.requestHeaders;
-        included = 'X-Vault-Token';
+        included = 'x-vault-token';
       } else if (backend.type === 'github') {
         keys = body;
         included = 'token';
diff --git a/ui/tests/acceptance/mfa-login-enforcement-test.js b/ui/tests/acceptance/mfa-login-enforcement-test.js
index f3f59abff2..1c4751d374 100644
--- a/ui/tests/acceptance/mfa-login-enforcement-test.js
+++ b/ui/tests/acceptance/mfa-login-enforcement-test.js
@@ -5,7 +5,7 @@
 
 import { module, test } from 'qunit';
 import { setupApplicationTest } from 'ember-qunit';
-import { click, currentRouteName, fillIn, visit } from '@ember/test-helpers';
+import { click, currentRouteName, fillIn, visit, waitFor } from '@ember/test-helpers';
 import authPage from 'vault/tests/pages/auth';
 import { setupMirage } from 'ember-cli-mirage/test-support';
 import mfaConfigHandlers from 'vault/mirage/handlers/mfa-config';
@@ -134,6 +134,7 @@ module('Acceptance | mfa-login-enforcement', function (hooks) {
     assert.dom('h1').includesText(enforcement.name, 'Name renders in title');
     assert.dom('h1 svg').hasClass('flight-icon-lock', 'Lock icon renders in title');
     assert.dom('[data-test-tab="targets"]').hasClass('active', 'Targets tab is active by default');
+    await waitFor('[data-test-target]', { timeout: 5000 });
     assert.dom('[data-test-target]').exists({ count: 4 }, 'Targets render in list');
     // targets tab
     const targets = {
@@ -231,6 +232,7 @@ module('Acceptance | mfa-login-enforcement', function (hooks) {
     await click('[data-test-mlef-remove-target="Authentication method"]');
     await click('[data-test-mlef-save]');
 
+    await waitFor('[data-test-target]', { timeout: 5000 });
     assert.strictEqual(
       currentRouteName(),
       'vault.cluster.access.mfa.enforcements.enforcement.index',
diff --git a/ui/tests/acceptance/mfa-login-test.js b/ui/tests/acceptance/mfa-login-test.js
index d6115d2d8d..5154a6647b 100644
--- a/ui/tests/acceptance/mfa-login-test.js
+++ b/ui/tests/acceptance/mfa-login-test.js
@@ -5,7 +5,7 @@
 
 import { module, test } from 'qunit';
 import { setupApplicationTest } from 'ember-qunit';
-import { click, currentRouteName, fillIn, visit, waitUntil, find } from '@ember/test-helpers';
+import { click, currentRouteName, fillIn, visit, waitUntil, find, waitFor } from '@ember/test-helpers';
 import { setupMirage } from 'ember-cli-mirage/test-support';
 import mfaLoginHandler, { validationHandler } from '../../mirage/handlers/mfa-login';
 
@@ -35,7 +35,11 @@ module('Acceptance | mfa-login', function (hooks) {
     await fillIn('[data-test-password]', 'test');
     await click('[data-test-auth-submit]');
   };
-  const didLogin = (assert) => {
+  const didLogin = async (assert) => {
+    await waitFor('[data-test-dashboard-card-header]', {
+      timeout: 5000,
+      timeoutMessage: 'timed out waiting for dashboard title to render',
+    });
     assert.strictEqual(currentRouteName(), 'vault.cluster.dashboard', 'Route transitions after login');
   };
   const validate = async (multi) => {
@@ -58,7 +62,7 @@ module('Acceptance | mfa-login', function (hooks) {
     assert.dom('[data-test-mfa-select]').doesNotExist('Select is hidden for single method');
     assert.dom('[data-test-mfa-passcode]').exists({ count: 1 }, 'Single passcode input renders');
     await validate();
-    didLogin(assert);
+    await didLogin(assert);
   });
 
   test('it should handle single mfa constraint with push method', async function (assert) {
@@ -84,7 +88,7 @@ module('Acceptance | mfa-login', function (hooks) {
     });
 
     await login('mfa-b');
-    didLogin(assert);
+    await didLogin(assert);
   });
 
   test('it should handle single mfa constraint with 2 passcode methods', async function (assert) {
@@ -99,7 +103,7 @@ module('Acceptance | mfa-login', function (hooks) {
     assert.dom('[data-test-mfa-passcode]').doesNotExist('Passcode input hidden until selection is made');
     await this.select();
     await validate();
-    didLogin(assert);
+    await didLogin(assert);
   });
 
   test('it should handle single mfa constraint with 2 push methods', async function (assert) {
@@ -107,7 +111,7 @@ module('Acceptance | mfa-login', function (hooks) {
     await login('mfa-d');
     await this.select();
     await click('[data-test-mfa-validate]');
-    didLogin(assert);
+    await didLogin(assert);
   });
 
   test('it should handle single mfa constraint with 1 passcode and 1 push method', async function (assert) {
@@ -118,7 +122,7 @@ module('Acceptance | mfa-login', function (hooks) {
     await this.select();
     assert.dom('[data-test-mfa-passcode]').doesNotExist('Passcode input is hidden for push method');
     await click('[data-test-mfa-validate]');
-    didLogin(assert);
+    await didLogin(assert);
   });
 
   test('it should handle multiple mfa constraints with 1 passcode method each', async function (assert) {
@@ -132,13 +136,13 @@ module('Acceptance | mfa-login', function (hooks) {
       );
     assert.dom('[data-test-mfa-select]').doesNotExist('Selects do not render for single methods');
     await validate(true);
-    didLogin(assert);
+    await didLogin(assert);
   });
 
   test('it should handle multi mfa constraint with 1 push method each', async function (assert) {
     assert.expect(1);
     await login('mfa-g');
-    didLogin(assert);
+    await didLogin(assert);
   });
 
   test('it should handle multiple mfa constraints with 1 passcode and 1 push method', async function (assert) {
@@ -153,7 +157,7 @@ module('Acceptance | mfa-login', function (hooks) {
     assert.dom('[data-test-mfa-select]').doesNotExist('Select is hidden for single method');
     assert.dom('[data-test-mfa-passcode]').exists({ count: 1 }, 'Passcode input renders');
     await validate();
-    didLogin(assert);
+    await didLogin(assert);
   });
 
   test('it should handle multiple mfa constraints with multiple mixed methods', async function (assert) {
@@ -168,11 +172,12 @@ module('Acceptance | mfa-login', function (hooks) {
     await this.select();
     await fillIn('[data-test-mfa-passcode="1"]', 'test');
     await click('[data-test-mfa-validate]');
-    didLogin(assert);
+    await didLogin(assert);
   });
 
   test('it should render unauthorized message for push failure', async function (assert) {
     await login('mfa-j');
+    await waitFor('[data-test-empty-state-title]');
     assert.dom('[data-test-auth-form]').doesNotExist('Auth form hidden when mfa fails');
     assert.dom('[data-test-empty-state-title]').hasText('Unauthorized', 'Error title renders');
     assert
diff --git a/ui/tests/acceptance/mfa-setup-test.js b/ui/tests/acceptance/mfa-setup-test.js
index abfcf7e80a..1750356253 100644
--- a/ui/tests/acceptance/mfa-setup-test.js
+++ b/ui/tests/acceptance/mfa-setup-test.js
@@ -7,7 +7,7 @@ import { module, test } from 'qunit';
 import { create } from 'ember-cli-page-object';
 import { v4 as uuidv4 } from 'uuid';
 import { setupApplicationTest } from 'ember-qunit';
-import { click, fillIn } from '@ember/test-helpers';
+import { click, fillIn, waitFor } from '@ember/test-helpers';
 import authPage from 'vault/tests/pages/auth';
 import enablePage from 'vault/tests/pages/settings/auth/enable';
 import consoleClass from 'vault/tests/pages/components/console/ui-panel';
@@ -77,9 +77,11 @@ module('Acceptance | mfa-setup', function (hooks) {
     });
     await fillIn('[data-test-input="uuid"]', 123);
     await click('[data-test-verify]');
+    await waitFor('[data-test-qrcode]', { timeout: 5000 });
     assert.dom('[data-test-qrcode]').exists('the qrCode is shown.');
     assert.dom('[data-test-mfa-enabled-warning]').doesNotExist('warning does not show.');
     await click('[data-test-restart]');
+    await waitFor('[data-test-step-one]', { timeout: 5000 });
     assert.dom('[data-test-step-one]').exists('back to step one.');
   });
 
@@ -95,6 +97,7 @@ module('Acceptance | mfa-setup', function (hooks) {
 
     await fillIn('[data-test-input="uuid"]', 123);
     await click('[data-test-verify]');
+    await waitFor('[data-test-mfa-enabled-warning]', { timeout: 5000 });
     assert.dom('[data-test-qrcode]').doesNotExist('the qrCode is not shown.');
     assert.dom('[data-test-mfa-enabled-warning]').exists('the mfa-enabled warning shows.');
   });
diff --git a/ui/tests/acceptance/pki/pki-configuration-test.js b/ui/tests/acceptance/pki/pki-configuration-test.js
index 7e1176a495..3e9fae9507 100644
--- a/ui/tests/acceptance/pki/pki-configuration-test.js
+++ b/ui/tests/acceptance/pki/pki-configuration-test.js
@@ -3,10 +3,11 @@
  * SPDX-License-Identifier: BUSL-1.1
  */
 
+/* eslint-disable ember/no-settled-after-test-helper */
 import { module, test } from 'qunit';
 import { setupApplicationTest } from 'ember-qunit';
 import { setupMirage } from 'ember-cli-mirage/test-support';
-import { click, currentURL, fillIn, visit, isSettled, waitUntil, find } from '@ember/test-helpers';
+import { click, currentURL, fillIn, visit, settled, find, waitFor, waitUntil } from '@ember/test-helpers';
 import { v4 as uuidv4 } from 'uuid';
 
 import authPage from 'vault/tests/pages/auth';
@@ -44,7 +45,7 @@ module('Acceptance | pki configuration test', function (hooks) {
       await visit(`/vault/secrets/${this.mountPath}/pki/configuration`);
       await click(SELECTORS.configuration.configureButton);
       assert.strictEqual(currentURL(), `/vault/secrets/${this.mountPath}/pki/configuration/create`);
-      await isSettled();
+      await settled();
       await click(SELECTORS.configuration.generateRootOption);
       await fillIn(SELECTORS.configuration.typeField, 'exported');
       await fillIn(SELECTORS.configuration.generateRootCommonNameField, 'issuer-common-0');
@@ -52,15 +53,19 @@ module('Acceptance | pki configuration test', function (hooks) {
       await click(SELECTORS.configuration.generateRootSave);
       await click(SELECTORS.configuration.doneButton);
       assert.strictEqual(currentURL(), `/vault/secrets/${this.mountPath}/pki/overview`);
-      await isSettled();
+      await settled();
       await click(SELECTORS.configTab);
-      await isSettled();
+      await settled();
       assert.strictEqual(currentURL(), `/vault/secrets/${this.mountPath}/pki/configuration`);
       await click(SELECTORS.configuration.issuerLink);
-      await isSettled();
+      await settled();
+      await waitFor(SELECTORS.configuration.deleteAllIssuerModal, { timeout: 5000 });
       assert.dom(SELECTORS.configuration.deleteAllIssuerModal).exists();
       await fillIn(SELECTORS.configuration.deleteAllIssuerInput, 'delete-all');
       await click(SELECTORS.configuration.deleteAllIssuerButton);
+      await settled();
+      await waitUntil(() => !find(SELECTORS.configuration.deleteAllIssuerModal));
+
       assert.dom(SELECTORS.configuration.deleteAllIssuerModal).doesNotExist();
       assert.strictEqual(currentURL(), `/vault/secrets/${this.mountPath}/pki/configuration`);
     });
@@ -92,10 +97,11 @@ module('Acceptance | pki configuration test', function (hooks) {
         'goes to configuration page'
       );
       await click(SELECTORS.configuration.issuerLink);
+      await waitFor(SELECTORS.configuration.deleteAllIssuerModal);
       assert.dom(SELECTORS.configuration.deleteAllIssuerModal).exists();
       await fillIn(SELECTORS.configuration.deleteAllIssuerInput, 'delete-all');
       await click(SELECTORS.configuration.deleteAllIssuerButton);
-      await isSettled();
+      await waitUntil(() => !find(SELECTORS.configuration.deleteAllIssuerModal));
       assert
         .dom(SELECTORS.configuration.deleteAllIssuerModal)
         .doesNotExist('delete all issuers modal closes');
@@ -104,10 +110,9 @@ module('Acceptance | pki configuration test', function (hooks) {
         `/vault/secrets/${this.mountPath}/pki/configuration`,
         'is still on configuration page'
       );
-      await isSettled();
+      await settled();
       await visit(`/vault/secrets/${this.mountPath}/pki/overview`);
-      await waitUntil(() => currentURL() === `/vault/secrets/${this.mountPath}/pki/overview`);
-      await isSettled();
+      await settled();
       assert.strictEqual(
         currentURL(),
         `/vault/secrets/${this.mountPath}/pki/overview`,
@@ -120,25 +125,25 @@ module('Acceptance | pki configuration test', function (hooks) {
         );
 
       await visit(`/vault/secrets/${this.mountPath}/pki/roles`);
-      await isSettled();
+      await settled();
       assert
         .dom(SELECTORS.emptyStateMessage)
         .hasText("This PKI mount hasn't yet been configured with a certificate issuer.");
 
       await visit(`/vault/secrets/${this.mountPath}/pki/issuers`);
-      await isSettled();
+      await settled();
       assert
         .dom(SELECTORS.emptyStateMessage)
         .hasText("This PKI mount hasn't yet been configured with a certificate issuer.");
 
       await visit(`/vault/secrets/${this.mountPath}/pki/keys`);
-      await isSettled();
+      await settled();
       assert
         .dom(SELECTORS.emptyStateMessage)
         .hasText("This PKI mount hasn't yet been configured with a certificate issuer.");
 
       await visit(`/vault/secrets/${this.mountPath}/pki/certificates`);
-      await isSettled();
+      await settled();
       assert
         .dom(SELECTORS.emptyStateMessage)
         .hasText(
@@ -148,6 +153,7 @@ module('Acceptance | pki configuration test', function (hooks) {
 
     test('it shows the correct empty state message if roles and certificates exists after delete all issuers', async function (assert) {
       await authPage.login(this.pkiAdminToken);
+      // Configure PKI
       await visit(`/vault/secrets/${this.mountPath}/pki/configuration`);
       await click(SELECTORS.configuration.configureButton);
       assert.strictEqual(currentURL(), `/vault/secrets/${this.mountPath}/pki/configuration/create`);
@@ -157,6 +163,7 @@ module('Acceptance | pki configuration test', function (hooks) {
       await fillIn(SELECTORS.configuration.generateRootIssuerNameField, 'issuer-0');
       await click(SELECTORS.configuration.generateRootSave);
       await click(SELECTORS.configuration.doneButton);
+      // Create role and root CA"
       await runCmd([
         `write ${this.mountPath}/roles/some-role \
         issuer_ref="default" \
@@ -169,16 +176,17 @@ module('Acceptance | pki configuration test', function (hooks) {
       await click(SELECTORS.configTab);
       assert.strictEqual(currentURL(), `/vault/secrets/${this.mountPath}/pki/configuration`);
       await click(SELECTORS.configuration.issuerLink);
+      await waitFor(SELECTORS.configuration.deleteAllIssuerModal);
       assert.dom(SELECTORS.configuration.deleteAllIssuerModal).exists();
       await fillIn(SELECTORS.configuration.deleteAllIssuerInput, 'delete-all');
       await click(SELECTORS.configuration.deleteAllIssuerButton);
-      await isSettled();
+      await settled();
+      await waitUntil(() => !find(SELECTORS.configuration.deleteAllIssuerModal));
       assert.dom(SELECTORS.configuration.deleteAllIssuerModal).doesNotExist();
       assert.strictEqual(currentURL(), `/vault/secrets/${this.mountPath}/pki/configuration`);
-      await isSettled();
+      await settled();
       await visit(`/vault/secrets/${this.mountPath}/pki/overview`);
-      await waitUntil(() => currentURL() === `/vault/secrets/${this.mountPath}/pki/overview`);
-      await isSettled();
+      await settled();
       assert.strictEqual(currentURL(), `/vault/secrets/${this.mountPath}/pki/overview`);
       assert
         .dom(SELECTORS.emptyStateMessage)
@@ -187,7 +195,7 @@ module('Acceptance | pki configuration test', function (hooks) {
         );
 
       await visit(`/vault/secrets/${this.mountPath}/pki/roles`);
-      await isSettled();
+      await settled();
       assert
         .dom(SELECTORS.emptyStateMessage)
         .hasText(
@@ -195,19 +203,19 @@ module('Acceptance | pki configuration test', function (hooks) {
         );
 
       await visit(`/vault/secrets/${this.mountPath}/pki/issuers`);
-      await isSettled();
+      await settled();
       assert
         .dom(SELECTORS.emptyStateMessage)
         .hasText("This PKI mount hasn't yet been configured with a certificate issuer.");
 
       await visit(`/vault/secrets/${this.mountPath}/pki/keys`);
-      await isSettled();
+      await settled();
       assert
         .dom(SELECTORS.emptyStateMessage)
         .hasText("This PKI mount hasn't yet been configured with a certificate issuer.");
 
       await visit(`/vault/secrets/${this.mountPath}/pki/certificates`);
-      await isSettled();
+      await settled();
       assert
         .dom(SELECTORS.emptyStateMessage)
         .hasText(
diff --git a/ui/tests/acceptance/sync/secrets/destination-test.js b/ui/tests/acceptance/sync/secrets/destination-test.js
index 0ace5f28f5..b5182b90c6 100644
--- a/ui/tests/acceptance/sync/secrets/destination-test.js
+++ b/ui/tests/acceptance/sync/secrets/destination-test.js
@@ -3,13 +3,14 @@
  * SPDX-License-Identifier: BUSL-1.1
  */
 
+/* eslint-disable ember/no-settled-after-test-helper */
 import { module, test } from 'qunit';
 import { setupApplicationTest } from 'ember-qunit';
 import { setupMirage } from 'ember-cli-mirage/test-support';
 import syncScenario from 'vault/mirage/scenarios/sync';
 import syncHandlers from 'vault/mirage/handlers/sync';
 import authPage from 'vault/tests/pages/auth';
-import { click, visit, currentURL, fillIn, currentRouteName } from '@ember/test-helpers';
+import { settled, click, visit, currentURL, fillIn, currentRouteName } from '@ember/test-helpers';
 import { PAGE as ts } from 'vault/tests/helpers/sync/sync-selectors';
 
 // sync is an enterprise feature but since mirage is used the enterprise label has been intentionally omitted from the module name
@@ -101,6 +102,7 @@ module('Acceptance | sync | destination', function (hooks) {
     this.server.db.syncDestinations.update({ purge_initiated_at: '2024-02-08T11:49:04.123251-07:00' });
 
     await visit('vault/sync/secrets/overview');
+    await settled();
     await click(ts.overview.table.actionToggle(0));
     await click(ts.overview.table.action('sync'));
     assert.strictEqual(
diff --git a/ui/tests/acceptance/sync/secrets/overview-test.js b/ui/tests/acceptance/sync/secrets/overview-test.js
index eb79c58b8a..ea24d262f7 100644
--- a/ui/tests/acceptance/sync/secrets/overview-test.js
+++ b/ui/tests/acceptance/sync/secrets/overview-test.js
@@ -9,7 +9,7 @@ import { setupMirage } from 'ember-cli-mirage/test-support';
 import syncScenario from 'vault/mirage/scenarios/sync';
 import syncHandlers from 'vault/mirage/handlers/sync';
 import authPage from 'vault/tests/pages/auth';
-import { click } from '@ember/test-helpers';
+import { click, waitFor } from '@ember/test-helpers';
 import { PAGE as ts } from 'vault/tests/helpers/sync/sync-selectors';
 
 // sync is an enterprise feature but since mirage is used the enterprise label has been intentionally omitted from the module name
@@ -29,10 +29,12 @@ module('Acceptance | sync | destination', function (hooks) {
     await click(ts.createCancel);
     await click(ts.overviewCard.actionLink('Create new'));
     await click(ts.createCancel);
+    await waitFor(ts.overview.table.actionToggle(0));
     await click(ts.overview.table.actionToggle(0));
     await click(ts.overview.table.action('sync'));
     await click(ts.destinations.sync.cancel);
     await click(ts.breadcrumbLink('Secrets Sync'));
+    await waitFor(ts.overview.table.actionToggle(0));
     await click(ts.overview.table.actionToggle(0));
     await click(ts.overview.table.action('details'));
     assert.dom(ts.tab('Secrets')).hasClass('active', 'Navigates to secrets view for destination');
diff --git a/ui/tests/integration/components/auth-form-test.js b/ui/tests/integration/components/auth-form-test.js
index 1f589229c6..8e1dd06f3a 100644
--- a/ui/tests/integration/components/auth-form-test.js
+++ b/ui/tests/integration/components/auth-form-test.js
@@ -244,7 +244,7 @@ module('Integration | Component | auth form', function (hooks) {
       'makes call to unwrap the token'
     );
     assert.strictEqual(
-      server.handledRequests[0].requestHeaders['X-Vault-Token'],
+      server.handledRequests[0].requestHeaders['x-vault-token'],
       wrappedToken,
       'uses passed wrapped token for the unwrap'
     );
diff --git a/ui/tests/integration/components/page/userpass-reset-password-test.js b/ui/tests/integration/components/page/userpass-reset-password-test.js
index d16b24a2cd..c995e10f7f 100644
--- a/ui/tests/integration/components/page/userpass-reset-password-test.js
+++ b/ui/tests/integration/components/page/userpass-reset-password-test.js
@@ -7,7 +7,7 @@ import { module, test } from 'qunit';
 import { setupRenderingTest } from 'vault/tests/helpers';
 import { setupMirage } from 'ember-cli-mirage/test-support';
 import { Response } from 'miragejs';
-import { click, fillIn, render } from '@ember/test-helpers';
+import { click, fillIn, render, settled } from '@ember/test-helpers';
 import { hbs } from 'ember-cli-htmlbars';
 
 const S = {
@@ -44,6 +44,8 @@ module('Integration | Component | page/userpass-reset-password', function (hooks
 
     await fillIn(S.input, 'new');
     await click(S.save);
+    // eslint-disable-next-line ember/no-settled-after-test-helper
+    await settled();
 
     assert.dom(S.input).hasValue('', 'After successful save shows input again with empty value');
   });
@@ -64,6 +66,8 @@ module('Integration | Component | page/userpass-reset-password', function (hooks
     await fillIn(S.input, 'invalid-pw');
     await click(S.save);
 
+    // eslint-disable-next-line ember/no-settled-after-test-helper
+    await settled();
     assert.dom(S.error).hasText('Error some error occurred', 'Shows error from API');
   });
 });
diff --git a/ui/tests/integration/components/shamir/dr-token-flow-test.js b/ui/tests/integration/components/shamir/dr-token-flow-test.js
index 2cbb76bf25..b3a3032e83 100644
--- a/ui/tests/integration/components/shamir/dr-token-flow-test.js
+++ b/ui/tests/integration/components/shamir/dr-token-flow-test.js
@@ -6,7 +6,7 @@
 import sinon from 'sinon';
 import { module, test } from 'qunit';
 import { setupRenderingTest } from 'vault/tests/helpers';
-import { click, fillIn, render } from '@ember/test-helpers';
+import { click, fillIn, find, render, waitUntil } from '@ember/test-helpers';
 import { hbs } from 'ember-cli-htmlbars';
 import { setupMirage } from 'ember-cli-mirage/test-support';
 
@@ -54,8 +54,13 @@ module('Integration | Component | shamir/dr-token-flow', function (hooks) {
     assert.dom('[data-test-dr-token-flow-step="begin"]').exists('First step shows');
     assert.dom('[data-test-use-pgp-key-cta]').hasText('Provide PGP Key');
     assert.dom('[data-test-generate-token-cta]').hasText('Generate operation token');
+
     await click('[data-test-generate-token-cta]');
-    assert.dom('[data-test-dr-token-flow-step="shamir"]').exists('Shows shamir step after start');
+
+    assert.ok(
+      await waitUntil(() => find('[data-test-dr-token-flow-step="shamir"]')),
+      'shows shamir step after start'
+    );
     assert
       .dom('.shamir-progress')
       .hasText('0/3 keys provided', 'progress shows reflecting checkStatus response with defaults');
@@ -64,13 +69,15 @@ module('Integration | Component | shamir/dr-token-flow', function (hooks) {
     // Fill in shamir key and submit
     await fillIn('[data-test-shamir-key-input]', 'some-key');
     await click('[data-test-shamir-submit]');
-    assert.dom('.shamir-progress').hasText('1/3 keys provided', 'progress shows reflecting attempt response');
-    assert
-      .dom('[data-test-otp-info]')
-      .exists('OTP info still banner shows even when attempt response does not include it');
+
+    assert.ok(
+      await waitUntil(() => find('[data-test-otp-info]')),
+      'OTP info still banner shows even when attempt response does not include it'
+    );
     assert
       .dom('[data-test-otp]')
       .hasText('otp-9876', 'Still shows OTP in copy banner when attempt response does not include it');
+    assert.dom('.shamir-progress').hasText('1/3 keys provided', 'progress shows reflecting attempt response');
   });
 
   test('middle to finish flow works', async function (assert) {
@@ -107,7 +114,11 @@ module('Integration | Component | shamir/dr-token-flow', function (hooks) {
       };
     });
     await render(hbs`<Shamir::DrTokenFlow @action="generate-dr-operation-token" />`);
-    assert.dom('[data-test-dr-token-flow-step="shamir"]').exists('Shows shamir step on load');
+
+    assert.ok(
+      await waitUntil(() => find('[data-test-dr-token-flow-step="shamir"]')),
+      'shows shamir step after start'
+    );
     assert
       .dom('.shamir-progress')
       .hasText('2/3 keys provided', 'progress shows reflecting checkStatus response');
@@ -115,9 +126,11 @@ module('Integration | Component | shamir/dr-token-flow', function (hooks) {
     assert.dom('[data-test-otp]').doesNotExist('otp-9876', 'OTP copy banner not shown');
     await fillIn('[data-test-shamir-key-input]', 'some-key');
     await click('[data-test-shamir-submit]');
-    assert
-      .dom('[data-test-dr-token-flow-step="show-token"]')
-      .exists('updates to show encoded token on complete');
+
+    assert.ok(
+      await waitUntil(() => find('[data-test-dr-token-flow-step="show-token"]')),
+      'updates to show encoded token on complete'
+    );
     assert
       .dom('[data-test-shamir-encoded-token]')
       .hasText('encoded-token-here', 'shows encoded token from /update response');
@@ -148,7 +161,10 @@ module('Integration | Component | shamir/dr-token-flow', function (hooks) {
     await fillIn('[data-test-pgp-file-textarea]', 'some-key-here');
     await click('[data-test-use-pgp-key-button]');
     await click('[data-test-confirm-pgp-key-submit]');
-    assert.dom('[data-test-dr-token-flow-step="shamir"]').exists('Renders shamir step after PGP key chosen');
+    assert.ok(
+      await waitUntil(() => find('[data-test-dr-token-flow-step="shamir"]')),
+      'Renders shamir step after PGP key chosen'
+    );
   });
 
   test('it cancels correctly when generation not started', async function (assert) {
@@ -170,11 +186,14 @@ module('Integration | Component | shamir/dr-token-flow', function (hooks) {
     await click('[data-test-shamir-modal-cancel-button]');
     assert.ok(cancelSpy.calledOnce, 'cancel spy called on click');
   });
+
   test('it cancels correctly when generation has started but not finished', async function (assert) {
-    assert.expect(3);
-    const cancelSpy = sinon.spy();
+    assert.expect(6);
+    const cancelSpy = sinon.spy(() => {
+      assert.ok(true, 'passed cancel method called');
+    });
     this.set('onCancel', cancelSpy);
-    this.server.get('/sys/replication/dr/secondary/generate-operation-token/attempt', function () {
+    this.server.get('sys/replication/dr/secondary/generate-operation-token/attempt', function () {
       return {
         started: true,
         progress: 1,
@@ -183,17 +202,24 @@ module('Integration | Component | shamir/dr-token-flow', function (hooks) {
       };
     });
     this.server.delete('/sys/replication/dr/secondary/generate-operation-token/attempt', function () {
-      assert.ok('delete endpoint is queried');
+      assert.ok(true, 'delete endpoint is queried');
       return {};
     });
     await render(
       hbs`<Shamir::DrTokenFlow @action="generate-dr-operation-token" @onCancel={{this.onCancel}} />`
     );
-
     assert.dom('[data-test-shamir-modal-cancel-button]').hasText('Cancel', 'Close button has correct copy');
+    assert.ok(await waitUntil(() => find('[data-test-shamir-key-input]')), 'shows shamir key input');
+
     await click('[data-test-shamir-modal-cancel-button]');
-    assert.ok(cancelSpy.calledOnce, 'cancel spy called on click');
+
+    assert.ok(
+      await waitUntil(() => find('[data-test-generate-token-cta]')),
+      'shows generate token button again'
+    );
+    assert.dom('[data-test-shamir-key-input]').doesNotExist('Does not render input for shamir key');
   });
+
   test('it closes correctly when generation is completed', async function (assert) {
     assert.expect(2);
     const cancelSpy = sinon.spy();
@@ -215,6 +241,7 @@ module('Integration | Component | shamir/dr-token-flow', function (hooks) {
       hbs`<Shamir::DrTokenFlow @action="generate-dr-operation-token" @onCancel={{this.onCancel}} />`
     );
 
+    await waitUntil(() => find('[data-test-dr-token-flow-step="show-token"]'));
     assert.dom('[data-test-shamir-modal-cancel-button]').hasText('Close', 'Close button has correct copy');
     await click('[data-test-shamir-modal-cancel-button]');
     assert.ok(cancelSpy.calledOnce, 'cancel spy called on click');
diff --git a/ui/tests/integration/components/sync/secrets/page/overview-test.js b/ui/tests/integration/components/sync/secrets/page/overview-test.js
index 5e22f3045c..2587b8df50 100644
--- a/ui/tests/integration/components/sync/secrets/page/overview-test.js
+++ b/ui/tests/integration/components/sync/secrets/page/overview-test.js
@@ -3,6 +3,7 @@
  * SPDX-License-Identifier: BUSL-1.1
  */
 
+/* eslint-disable ember/no-settled-after-test-helper */
 import { module, test } from 'qunit';
 import { setupRenderingTest } from 'ember-qunit';
 import { setupEngine } from 'ember-engines/test-support';
@@ -114,6 +115,7 @@ module('Integration | Component | sync | Page::Overview', function (hooks) {
     assert.dom(name(0)).hasText('destination-aws', 'First destination renders on page 1');
 
     await click(pagination.next);
+    await settled();
     assert.dom(overview.table.row).exists({ count: 3 }, 'New items are fetched and rendered on page change');
     assert.dom(name(0)).hasText('destination-gcp', 'First destination renders on page 2');
   });
@@ -124,6 +126,7 @@ module('Integration | Component | sync | Page::Overview', function (hooks) {
     });
     // since the request resolved trigger a page change and return an error from the associations endpoint
     await click(pagination.next);
+    await settled();
     assert.dom(emptyStateTitle).hasText('Error fetching information', 'Empty state title renders');
     assert
       .dom(emptyStateMessage)
diff --git a/ui/tests/integration/services/auth-test.js b/ui/tests/integration/services/auth-test.js
index 33c2298f3d..da00e65f2a 100644
--- a/ui/tests/integration/services/auth-test.js
+++ b/ui/tests/integration/services/auth-test.js
@@ -134,8 +134,8 @@ module('Integration | Service | auth', function (hooks) {
     this.server = new Pretender(function () {
       this.get('/v1/auth/token/lookup-self', function (request) {
         const resp = copy(ROOT_TOKEN_RESPONSE, true);
-        resp.id = request.requestHeaders['X-Vault-Token'];
-        resp.data.id = request.requestHeaders['X-Vault-Token'];
+        resp.id = request.requestHeaders['x-vault-token'];
+        resp.data.id = request.requestHeaders['x-vault-token'];
         return [200, {}, resp];
       });
       this.post('/v1/auth/userpass/login/:username', function (request) {
@@ -321,8 +321,8 @@ module('Integration | Service | auth', function (hooks) {
     this.server.map(function () {
       this.get('/v1/auth/token/lookup-self', function (request) {
         const resp = copy(tokenResp, true);
-        resp.id = request.requestHeaders['X-Vault-Token'];
-        resp.data.id = request.requestHeaders['X-Vault-Token'];
+        resp.id = request.requestHeaders['x-vault-token'];
+        resp.data.id = request.requestHeaders['x-vault-token'];
         return [200, {}, resp];
       });
     });
diff --git a/ui/tsconfig.json b/ui/tsconfig.json
index cf41d7a1eb..1f163fc908 100644
--- a/ui/tsconfig.json
+++ b/ui/tsconfig.json
@@ -12,6 +12,7 @@
     "noPropertyAccessFromIndexSignature": true,
     "noEmitOnError": true,
     "skipLibCheck": true,
+    "target": "es2021",
     // The combination of `baseUrl` with `paths` allows Ember's classic package
     // layout, which is not resolvable with the Node resolution algorithm, to
     // work with TypeScript.
diff --git a/ui/yarn.lock b/ui/yarn.lock
index 21365ff98c..5b0f0e4dd6 100644
--- a/ui/yarn.lock
+++ b/ui/yarn.lock
@@ -243,7 +243,7 @@ __metadata:
   languageName: node
   linkType: hard
 
-"@babel/core@npm:^7.20.2, @babel/core@npm:^7.21.0":
+"@babel/core@npm:^7.21.0":
   version: 7.22.9
   resolution: "@babel/core@npm:7.22.9"
   dependencies:
@@ -266,7 +266,7 @@ __metadata:
   languageName: node
   linkType: hard
 
-"@babel/core@npm:^7.23.6":
+"@babel/core@npm:^7.21.4, @babel/core@npm:^7.23.6":
   version: 7.23.7
   resolution: "@babel/core@npm:7.23.7"
   dependencies:
@@ -3002,7 +3002,7 @@ __metadata:
   languageName: node
   linkType: hard
 
-"@babel/plugin-transform-block-scoping@npm:^7.20.2, @babel/plugin-transform-block-scoping@npm:^7.20.5":
+"@babel/plugin-transform-block-scoping@npm:^7.20.5":
   version: 7.22.5
   resolution: "@babel/plugin-transform-block-scoping@npm:7.22.5"
   dependencies:
@@ -3013,7 +3013,7 @@ __metadata:
   languageName: node
   linkType: hard
 
-"@babel/plugin-transform-block-scoping@npm:^7.23.4":
+"@babel/plugin-transform-block-scoping@npm:^7.21.0, @babel/plugin-transform-block-scoping@npm:^7.23.4":
   version: 7.23.4
   resolution: "@babel/plugin-transform-block-scoping@npm:7.23.4"
   dependencies:
@@ -4969,15 +4969,6 @@ __metadata:
   languageName: node
   linkType: hard
 
-"@babel/runtime@npm:^7.20.1":
-  version: 7.22.6
-  resolution: "@babel/runtime@npm:7.22.6"
-  dependencies:
-    regenerator-runtime: ^0.13.11
-  checksum: e585338287c4514a713babf4fdb8fc2a67adcebab3e7723a739fc62c79cfda875b314c90fd25f827afb150d781af97bc16c85bfdbfa2889f06053879a1ddb597
-  languageName: node
-  linkType: hard
-
 "@babel/runtime@npm:^7.21.0":
   version: 7.21.5
   resolution: "@babel/runtime@npm:7.21.5"
@@ -5334,85 +5325,125 @@ __metadata:
   languageName: node
   linkType: hard
 
-"@ember-data/adapter@npm:4.11.3":
-  version: 4.11.3
-  resolution: "@ember-data/adapter@npm:4.11.3"
+"@ember-data/adapter@npm:4.12.5":
+  version: 4.12.5
+  resolution: "@ember-data/adapter@npm:4.12.5"
   dependencies:
-    "@ember-data/private-build-infra": 4.11.3
-    "@ember/edition-utils": ^1.2.0
+    "@ember-data/private-build-infra": 4.12.5
     "@embroider/macros": ^1.10.0
-    ember-auto-import: ^2.4.3
     ember-cli-babel: ^7.26.11
     ember-cli-test-info: ^1.0.0
   peerDependencies:
-    "@ember-data/store": 4.11.3
+    "@ember-data/store": 4.12.5
     "@ember/string": ^3.0.1
     ember-inflector: ^4.0.2
-  checksum: 2fc2366b334eb1e0a722d97296df11dd41b31dcd3343c41a90a21d0aeecc949ccb23ee94101830b91b7c6c74127cf55e953d1d4da67c3668776c95c107cda831
+  checksum: 224b66b96bd7b5e982d3c60720172b57c817153d97a1b396a36644e18571afaff2257af58ef7821bad7515f6aec37c78ceb82148c526f871cf3d11b2d1b2364b
   languageName: node
   linkType: hard
 
-"@ember-data/canary-features@npm:4.11.3":
-  version: 4.11.3
-  resolution: "@ember-data/canary-features@npm:4.11.3"
+"@ember-data/debug@npm:4.12.5":
+  version: 4.12.5
+  resolution: "@ember-data/debug@npm:4.12.5"
   dependencies:
-    "@embroider/macros": ^1.10.0
-    ember-cli-babel: ^7.26.11
-  checksum: 24983d2aa36cdd2a071abc64c3bece4c031004e5160e90ea8d65486ac6430746f0669c3fc6f1315b85ed401c58b98e910d8da92bc8e84fa11e36b8c9b3fc93c8
-  languageName: node
-  linkType: hard
-
-"@ember-data/debug@npm:4.11.3":
-  version: 4.11.3
-  resolution: "@ember-data/debug@npm:4.11.3"
-  dependencies:
-    "@ember-data/private-build-infra": 4.11.3
+    "@ember-data/private-build-infra": 4.12.5
     "@ember/edition-utils": ^1.2.0
     "@embroider/macros": ^1.10.0
-    ember-auto-import: ^2.4.3
+    ember-auto-import: ^2.6.1
     ember-cli-babel: ^7.26.11
   peerDependencies:
+    "@ember-data/store": 4.12.5
     "@ember/string": ^3.0.1
-  checksum: 9eac1c756e54e1a397ac7bb8442b2c621c1a6f6d9c07588e9bcaac160f19449fac6cfd2ce01358d4dfa80fdc72b1868f93b56ede9993339853c88b312e70198e
+  checksum: 2fcca256b2f8e0a5636312df4d4f6b4ac05d95552131d64a96eeef482221ea6426ff5164d9ffcab88e2f5e651010c91f1810d777439a6ba35ae3da6f8b6ef737
   languageName: node
   linkType: hard
 
-"@ember-data/model@npm:4.11.3":
-  version: 4.11.3
-  resolution: "@ember-data/model@npm:4.11.3"
+"@ember-data/graph@npm:4.12.5":
+  version: 4.12.5
+  resolution: "@ember-data/graph@npm:4.12.5"
   dependencies:
-    "@ember-data/canary-features": 4.11.3
-    "@ember-data/private-build-infra": 4.11.3
+    "@ember-data/private-build-infra": 4.12.5
+    "@ember/edition-utils": ^1.2.0
+    "@embroider/macros": ^1.10.0
+    ember-cli-babel: ^7.26.11
+  peerDependencies:
+    "@ember-data/store": 4.12.5
+  checksum: ed23005e79db2bb68269a168820f69404d60ea11e0c54ac12a8b3b5f156688f4e1d089b932bc8ee4737c4aa6b5dcc00b643ac9bce1ff24847b0f1719cd9bd0d4
+  languageName: node
+  linkType: hard
+
+"@ember-data/json-api@npm:4.12.5":
+  version: 4.12.5
+  resolution: "@ember-data/json-api@npm:4.12.5"
+  dependencies:
+    "@ember-data/private-build-infra": 4.12.5
+    "@ember/edition-utils": ^1.2.0
+    "@embroider/macros": ^1.10.0
+    ember-cli-babel: ^7.26.11
+  peerDependencies:
+    "@ember-data/graph": 4.12.5
+    "@ember-data/store": 4.12.5
+  checksum: 3b8f3d80f37e706edd829376a6d8184c7169fd1816fe4b91e8a67b142354be74ca3850263f7547f4c81cc51f6bef6c4408f5efd30aa07cfdaeec85f4fa12cf96
+  languageName: node
+  linkType: hard
+
+"@ember-data/legacy-compat@npm:4.12.5, @ember-data/legacy-compat@npm:~4.12.4":
+  version: 4.12.5
+  resolution: "@ember-data/legacy-compat@npm:4.12.5"
+  dependencies:
+    "@ember-data/private-build-infra": 4.12.5
+    "@embroider/macros": ^1.10.0
+    ember-cli-babel: ^7.26.11
+  peerDependencies:
+    "@ember-data/graph": 4.12.5
+    "@ember-data/json-api": 4.12.5
+  peerDependenciesMeta:
+    "@ember-data/graph":
+      optional: true
+    "@ember-data/json-api":
+      optional: true
+  checksum: e9cfa9f05534217f0eaa433f152251714937fcaead62beaf5e51a59b470bb8cbac4598abd6ba014ed39cd61ce35a033c78f0b9dfcd6c90cb62531ef098dfa8ce
+  languageName: node
+  linkType: hard
+
+"@ember-data/model@npm:4.12.5":
+  version: 4.12.5
+  resolution: "@ember-data/model@npm:4.12.5"
+  dependencies:
+    "@ember-data/private-build-infra": 4.12.5
     "@ember/edition-utils": ^1.2.0
     "@embroider/macros": ^1.10.0
-    ember-auto-import: ^2.4.3
     ember-cached-decorator-polyfill: ^1.0.1
     ember-cli-babel: ^7.26.11
     ember-cli-string-utils: ^1.1.0
     ember-cli-test-info: ^1.0.0
-    ember-compatibility-helpers: ^1.2.6
-    inflection: ~2.0.0
+    inflection: ~2.0.1
   peerDependencies:
-    "@ember-data/record-data": 4.11.3
-    "@ember-data/store": 4.11.3
-    "@ember-data/tracking": 4.11.3
+    "@ember-data/debug": 4.12.5
+    "@ember-data/graph": 4.12.5
+    "@ember-data/json-api": 4.12.5
+    "@ember-data/legacy-compat": 4.12.5
+    "@ember-data/store": 4.12.5
+    "@ember-data/tracking": 4.12.5
     "@ember/string": ^3.0.1
     ember-inflector: ^4.0.2
   peerDependenciesMeta:
-    "@ember-data/record-data":
+    "@ember-data/debug":
       optional: true
-  checksum: 734fd60c6a5bf84d657a86e4aa89f965c5624caf478d0b87d517bec589e3e6db2cba45e46dfcfa5a6506733a94bcf4c2f43daecaa9ad6f06b62a408da2714d13
+    "@ember-data/graph":
+      optional: true
+    "@ember-data/json-api":
+      optional: true
+  checksum: 2d17d16a665fac2c755e65ae690f6ade32d5dfd1d936ef0f1fab031b33977a659212dc384b73a4fb98df229ef254eeba9f3319592e0d4ff19150c6ba2ea67fa6
   languageName: node
   linkType: hard
 
-"@ember-data/private-build-infra@npm:4.11.3":
-  version: 4.11.3
-  resolution: "@ember-data/private-build-infra@npm:4.11.3"
+"@ember-data/private-build-infra@npm:4.12.5":
+  version: 4.12.5
+  resolution: "@ember-data/private-build-infra@npm:4.12.5"
   dependencies:
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