diff --git a/packages/osd-ui-shared-deps/theme.ts b/packages/osd-ui-shared-deps/theme.ts
index 1f7f70b85c5..45a4f68cfd4 100644
--- a/packages/osd-ui-shared-deps/theme.ts
+++ b/packages/osd-ui-shared-deps/theme.ts
@@ -46,8 +46,8 @@ if (version === 7) {
   euiLightVars = require('@elastic/eui/dist/eui_theme_light.json');
   euiDarkVars = require('@elastic/eui/dist/eui_theme_dark.json');
 } else {
-  euiLightVars = require('@elastic/eui/dist/eui_theme_amsterdam_light.json');
-  euiDarkVars = require('@elastic/eui/dist/eui_theme_amsterdam_dark.json');
+  euiLightVars = require('@elastic/eui/dist/eui_theme_next_light.json');
+  euiDarkVars = require('@elastic/eui/dist/eui_theme_next_dark.json');
 }
 
 /**
diff --git a/packages/osd-ui-shared-deps/webpack.config.js b/packages/osd-ui-shared-deps/webpack.config.js
index 397fbe12cd4..8acc43fb179 100644
--- a/packages/osd-ui-shared-deps/webpack.config.js
+++ b/packages/osd-ui-shared-deps/webpack.config.js
@@ -45,8 +45,8 @@ exports.getWebpackConfig = ({ dev = false } = {}) => ({
     'osd-ui-shared-deps': './entry.js',
     'osd-ui-shared-deps.v7.dark': ['@elastic/eui/dist/eui_theme_dark.css'],
     'osd-ui-shared-deps.v7.light': ['@elastic/eui/dist/eui_theme_light.css'],
-    'osd-ui-shared-deps.v8.dark': ['@elastic/eui/dist/eui_theme_amsterdam_dark.css'],
-    'osd-ui-shared-deps.v8.light': ['@elastic/eui/dist/eui_theme_amsterdam_light.css'],
+    'osd-ui-shared-deps.v8.dark': ['@elastic/eui/dist/eui_theme_next_dark.css'],
+    'osd-ui-shared-deps.v8.light': ['@elastic/eui/dist/eui_theme_next_light.css'],
   },
   context: __dirname,
   devtool: dev ? '#cheap-source-map' : false,
diff --git a/src/core/public/core_app/styles/_globals_v8dark.scss b/src/core/public/core_app/styles/_globals_v8dark.scss
index 2b92b49bcbf..2100e9762ca 100644
--- a/src/core/public/core_app/styles/_globals_v8dark.scss
+++ b/src/core/public/core_app/styles/_globals_v8dark.scss
@@ -2,6 +2,6 @@
 // ---
 // prepended to all .scss imports (from JS, when v8dark theme selected)
 
-@import "@elastic/eui/src/themes/eui-amsterdam/eui_amsterdam_colors_dark";
-@import "@elastic/eui/src/themes/eui-amsterdam/eui_amsterdam_globals";
+@import "@elastic/eui/src/themes/eui-next/eui_next_colors_dark";
+@import "@elastic/eui/src/themes/eui-next/eui_next_globals";
 @import "./mixins";
diff --git a/src/core/public/core_app/styles/_globals_v8light.scss b/src/core/public/core_app/styles/_globals_v8light.scss
index 914dbb3e383..ccc07e14e63 100644
--- a/src/core/public/core_app/styles/_globals_v8light.scss
+++ b/src/core/public/core_app/styles/_globals_v8light.scss
@@ -2,6 +2,6 @@
 // ---
 // prepended to all .scss imports (from JS, when v8light theme selected)
 
-@import "@elastic/eui/src/themes/eui-amsterdam/eui_amsterdam_colors_light";
-@import "@elastic/eui/src/themes/eui-amsterdam/eui_amsterdam_globals";
+@import "@elastic/eui/src/themes/eui-next/eui_next_colors_light";
+@import "@elastic/eui/src/themes/eui-next/eui_next_globals";
 @import "./mixins";
diff --git a/src/core/server/ui_settings/settings/theme.test.ts b/src/core/server/ui_settings/settings/theme.test.ts
index 2cba8dff962..54ed0c12907 100644
--- a/src/core/server/ui_settings/settings/theme.test.ts
+++ b/src/core/server/ui_settings/settings/theme.test.ts
@@ -57,11 +57,11 @@ describe('theme settings', () => {
 
     it('should only accept valid values', () => {
       expect(() => validate('v7')).not.toThrow();
-      expect(() => validate('v8 (beta)')).not.toThrow();
+      expect(() => validate('Cascadia (preview.1)')).not.toThrow();
       expect(() => validate('v12')).toThrowErrorMatchingInlineSnapshot(`
 "types that failed validation:
 - [0]: expected value to equal [v7]
-- [1]: expected value to equal [v8 (beta)]"
+- [1]: expected value to equal [Cascadia (preview.1)]"
 `);
     });
   });
diff --git a/src/core/server/ui_settings/settings/theme.ts b/src/core/server/ui_settings/settings/theme.ts
index 75c1431f2d7..cca7c218a84 100644
--- a/src/core/server/ui_settings/settings/theme.ts
+++ b/src/core/server/ui_settings/settings/theme.ts
@@ -51,13 +51,12 @@ export const getThemeSettings = (): Record<string, UiSettingsParams> => {
       }),
       value: 'v7',
       type: 'select',
-      options: ['v7', 'v8 (beta)'],
+      options: ['v7', 'Cascadia (preview.1)'],
       description: i18n.translate('core.ui_settings.params.themeVersionText', {
         defaultMessage: `Switch between the theme used for the current and next version of OpenSearch Dashboards, A page refresh is required for the setting to be applied.`,
       }),
       requiresPageReload: true,
-      schema: schema.oneOf([schema.literal('v7'), schema.literal('v8 (beta)')]),
-      readonly: true,
+      schema: schema.oneOf([schema.literal('v7'), schema.literal('Cascadia (preview.1)')]),
     },
   };
 };
diff --git a/src/core/server/ui_settings/ui_settings_client.test.ts b/src/core/server/ui_settings/ui_settings_client.test.ts
index a586d1d31eb..0f2804fd932 100644
--- a/src/core/server/ui_settings/ui_settings_client.test.ts
+++ b/src/core/server/ui_settings/ui_settings_client.test.ts
@@ -635,7 +635,7 @@ describe('ui settings', () => {
     });
 
     it('returns the overridden value for key theme:version', async () => {
-      const opensearchDocSource = { 'theme:version': 'v8 (beta)' };
+      const opensearchDocSource = { 'theme:version': 'Cascadia (preview.1)' };
       const overrides = { 'theme:version': 'v7' };
       const { uiSettings } = setup({ opensearchDocSource, overrides });
 
@@ -651,10 +651,10 @@ describe('ui settings', () => {
     });
 
     it('rewrites the key theme:version value without override', async () => {
-      const opensearchDocSource = { 'theme:version': 'v8 (beta)' };
+      const opensearchDocSource = { 'theme:version': 'Cascadia (preview.1)' };
       const { uiSettings } = setup({ opensearchDocSource });
 
-      expect(await uiSettings.get('theme:version')).toBe('v8 (beta)');
+      expect(await uiSettings.get('theme:version')).toBe('Cascadia (preview.1)');
     });
 
     it('returns the default value for an override with value null', async () => {
diff --git a/src/core/server/ui_settings/ui_settings_config.ts b/src/core/server/ui_settings/ui_settings_config.ts
index 61948143763..7c3d75b0b74 100644
--- a/src/core/server/ui_settings/ui_settings_config.ts
+++ b/src/core/server/ui_settings/ui_settings_config.ts
@@ -38,13 +38,8 @@ const deprecations: ConfigDeprecationProvider = ({ unused, renameFromRoot }) =>
 ];
 
 const configSchema = schema.object({
-  overrides: schema.object(
-    {
-      'theme:darkMode': schema.maybe(schema.boolean({ defaultValue: true })),
-      'theme:version': schema.string({ defaultValue: 'v7' }),
-    },
-    { unknowns: 'allow' }
-  ),
+  overrides: schema.object({}, { unknowns: 'allow' }),
+  // We don't explicitly need to limit to these 2; the code is written to handle all
   defaults: schema.object({
     'theme:darkMode': schema.maybe(schema.boolean({ defaultValue: false })),
     'theme:version': schema.maybe(schema.string({ defaultValue: 'v7' })),