diff --git a/modules/banner/element-web/src/Univention/navigation.ts b/modules/banner/element-web/src/Univention/navigation.ts
index 96b035d3ed..7acde49b04 100644
--- a/modules/banner/element-web/src/Univention/navigation.ts
+++ b/modules/banner/element-web/src/Univention/navigation.ts
@@ -5,7 +5,7 @@ SPDX-License-Identifier: AGPL-3.0-only OR LicenseRef-Element-Commercial
 Please see LICENSE files in the repository root for full details.
 */
 
-import { z } from "zod";
+import { z } from "zod/mini";
 
 import { StaticConfig } from "../config";
 
@@ -44,7 +44,7 @@ const UniventionCentralNavigation = z.object({
                     /**
                      * It’s usually empty.
                      */
-                    keywords: z.object({}).optional(),
+                    keywords: z.optional(z.object({})),
                 }),
             ),
         }),
diff --git a/modules/banner/element-web/src/config.ts b/modules/banner/element-web/src/config.ts
index 1066a85bc2..4ab5fbb9a6 100644
--- a/modules/banner/element-web/src/config.ts
+++ b/modules/banner/element-web/src/config.ts
@@ -5,10 +5,12 @@ SPDX-License-Identifier: AGPL-3.0-only OR LicenseRef-Element-Commercial
 Please see LICENSE files in the repository root for full details.
 */
 
-import { z, ZodSchema, ZodTypeDef } from "zod";
+import { z, ZodMiniType, input } from "zod/mini";
 
 import { Theme } from "./theme.ts";
 
+z.config(z.locales.en());
+
 const StaticConfig = z.object({
     type: z.literal("static"),
 
@@ -16,7 +18,7 @@ const StaticConfig = z.object({
      * Alternative logo URL to display in the popover menu.
      * Will use the main logo url if omitted.
      */
-    logo_url: z.string().url().optional(),
+    logo_url: z.optional(z.url()),
 
     /**
      * Categories of links to display in the menu.
@@ -35,7 +37,7 @@ const StaticConfig = z.object({
                     /**
                      * The URL to the icon.
                      */
-                    icon_uri: z.string().url(),
+                    icon_uri: z.url(),
                     /**
                      * The label of the link.
                      */
@@ -43,11 +45,11 @@ const StaticConfig = z.object({
                     /**
                      * The destination URL of the link.
                      */
-                    link_url: z.string().url(),
+                    link_url: z.url(),
                     /**
                      * The browsing context in which the browser opens the link.
                      */
-                    target: z.string().optional(),
+                    target: z.optional(z.string()),
                 }),
             ),
         }),
@@ -63,13 +65,13 @@ const UniventionConfig = z.object({
      * Alternative logo URL to display in the popover menu.
      * Will use the main logo url if omitted.
      */
-    logo_url: z.string().url().optional(),
+    logo_url: z.optional(z.url()),
 
     /**
      * Base URL to an Intercom Service
      * https://docs.software-univention.de/intercom-service/latest/architecture.html#endpoints
      */
-    ics_url: z.string().url(),
+    ics_url: z.url(),
 });
 
 export type UniventionConfig = z.infer<typeof UniventionConfig>;
@@ -79,13 +81,13 @@ export const ModuleConfig = z.object({
      * The URL of the portal logo.svg file.
      * @example `https://example.com/logo.svg`
      */
-    logo_url: z.string().url(),
+    logo_url: z.url(),
 
     /**
      * The URL of the portal.
      * @example `https://example.com`
      */
-    logo_link_url: z.string().url(),
+    logo_link_url: z.url(),
 
     /**
      * Configuration for the menu.
@@ -95,17 +97,17 @@ export const ModuleConfig = z.object({
     /**
      * Theme variable overrides, optional.
      */
-    theme: Theme.default({}),
+    theme: z.prefault(Theme, {}),
 });
 
 export type ModuleConfig = z.infer<typeof ModuleConfig>;
 
-export type ConfigSchema = ZodSchema<z.output<typeof ModuleConfig>, ZodTypeDef, z.input<typeof ModuleConfig>>;
+export type ConfigSchema = ZodMiniType<z.output<typeof ModuleConfig>, z.input<typeof ModuleConfig>>;
 
 export const CONFIG_KEY = "io.element.element-web-modules.banner";
 
 declare module "@element-hq/element-web-module-api" {
     export interface Config {
-        [CONFIG_KEY]: ConfigSchema["_input"];
+        [CONFIG_KEY]: input<ConfigSchema>;
     }
 }
diff --git a/modules/banner/element-web/src/theme.ts b/modules/banner/element-web/src/theme.ts
index aadc572c3f..5a13f27b9f 100644
--- a/modules/banner/element-web/src/theme.ts
+++ b/modules/banner/element-web/src/theme.ts
@@ -5,23 +5,23 @@ SPDX-License-Identifier: AGPL-3.0-only OR LicenseRef-Element-Commercial
 Please see LICENSE files in the repository root for full details.
 */
 
-import { z } from "zod";
+import { z } from "zod/mini";
 
 export const Theme = z.object({
-    textColor: z.string().default("var(--cpd-color-text-primary)"),
-    subheadingColor: z.string().default("var(--cpd-color-text-secondary)"),
-    bannerBackgroundColor: z.string().default("var(--cpd-color-bg-canvas-default)"),
-    bannerHeight: z.string().default("60px"),
-    triggerWidth: z.string().default("68px"),
-    triggerBackgroundColor: z.string().default("var(--cpd-color-bg-subtle-secondary)"),
-    triggerBackgroundColorHover: z.string().default("var(--cpd-color-bg-accent-hovered)"),
-    triggerBackgroundColorPressed: z.string().default("var(--cpd-color-bg-accent-pressed)"),
-    triggerColor: z.string().default("var(--cpd-color-icon-primary)"),
-    triggerColorContrast: z.string().default("var(--cpd-color-icon-on-solid-primary)"),
-    menuWidth: z.string().default("320px"),
-    menuBackgroundColor: z.string().default("var(--cpd-color-bg-canvas-default)"),
-    menuButtonBackgroundColorHover: z.string().default("var(--cpd-color-bg-action-secondary-hovered)"),
-    menuButtonBackgroundColorPressed: z.string().default("var(--cpd-color-bg-action-secondary-pressed)"),
+    textColor: z.prefault(z.string(), "var(--cpd-color-text-primary)"),
+    subheadingColor: z.prefault(z.string(), "var(--cpd-color-text-secondary)"),
+    bannerBackgroundColor: z.prefault(z.string(), "var(--cpd-color-bg-canvas-default)"),
+    bannerHeight: z.prefault(z.string(), "60px"),
+    triggerWidth: z.prefault(z.string(), "68px"),
+    triggerBackgroundColor: z.prefault(z.string(), "var(--cpd-color-bg-subtle-secondary)"),
+    triggerBackgroundColorHover: z.prefault(z.string(), "var(--cpd-color-bg-accent-hovered)"),
+    triggerBackgroundColorPressed: z.prefault(z.string(), "var(--cpd-color-bg-accent-pressed)"),
+    triggerColor: z.prefault(z.string(), "var(--cpd-color-icon-primary)"),
+    triggerColorContrast: z.prefault(z.string(), "var(--cpd-color-icon-on-solid-primary)"),
+    menuWidth: z.prefault(z.string(), "320px"),
+    menuBackgroundColor: z.prefault(z.string(), "var(--cpd-color-bg-canvas-default)"),
+    menuButtonBackgroundColorHover: z.prefault(z.string(), "var(--cpd-color-bg-action-secondary-hovered)"),
+    menuButtonBackgroundColorPressed: z.prefault(z.string(), "var(--cpd-color-bg-action-secondary-pressed)"),
 });
 
 export type Theme = z.infer<typeof Theme>;
diff --git a/modules/banner/element-web/tests/banner.spec.ts b/modules/banner/element-web/tests/banner.spec.ts
index fe60dfc3a4..22d57e32df 100644
--- a/modules/banner/element-web/tests/banner.spec.ts
+++ b/modules/banner/element-web/tests/banner.spec.ts
@@ -5,6 +5,8 @@ SPDX-License-Identifier: AGPL-3.0-only OR LicenseRef-Element-Commercial
 Please see LICENSE files in the repository root for full details.
 */
 
+import { input } from "zod/mini";
+
 import { test as base, expect } from "../../../../playwright/element-web-test.ts";
 import { type ConfigSchema } from "../src/config.ts";
 
@@ -39,7 +41,7 @@ test.describe("Banner", () => {
         // We don't take a screenshot as we don't want to assert Element's styling, only our own
     });
 
-    const configs: ConfigSchema["_input"][] = [
+    const configs: input<ConfigSchema>[] = [
         {
             logo_url: "http://localhost:8080/logo.svg",
             logo_link_url: "https://example.com/portal",
diff --git a/modules/restricted-guests/element-web/src/config.ts b/modules/restricted-guests/element-web/src/config.ts
index f5f03a3236..6fef66945e 100644
--- a/modules/restricted-guests/element-web/src/config.ts
+++ b/modules/restricted-guests/element-web/src/config.ts
@@ -5,7 +5,9 @@ SPDX-License-Identifier: AGPL-3.0-only OR LicenseRef-Element-Commercial
 Please see LICENSE files in the repository root for full details.
 */
 
-import { z, ZodSchema, ZodTypeDef } from "zod";
+import { z, ZodMiniType, input } from "zod/mini";
+
+z.config(z.locales.en());
 
 export const ModuleConfig = z.object({
     /**
@@ -13,33 +15,30 @@ export const ModuleConfig = z.object({
      * must have the `synapse-restricted-guests-module` installed.
      * @example `https://synapse.local`
      */
-    guest_user_homeserver_url: z.string().url(),
+    guest_user_homeserver_url: z.url(),
 
     /**
      * The username prefix that identifies guest users.
      * @defaultValue `@guest-`
      */
-    guest_user_prefix: z
-        .string()
-        .regex(/@[a-zA-Z-_1-9]+/)
-        .default("@guest-"),
+    guest_user_prefix: z._default(z.string().check(z.regex(/@[a-zA-Z-_1-9]+/)), "@guest-"),
 
     /**
      * If true, the user will be forwarded to the login page instead of to the SSO
      * login. This is only required if the home server has no SSO support.
      * @defaultValue `false`
      */
-    skip_single_sign_on: z.boolean().default(false),
+    skip_single_sign_on: z._default(z.boolean(), false),
 });
 
 export type ModuleConfig = z.infer<typeof ModuleConfig>;
 
-type ConfigSchema = ZodSchema<z.output<typeof ModuleConfig>, ZodTypeDef, z.input<typeof ModuleConfig>>;
+type ConfigSchema = ZodMiniType<z.output<typeof ModuleConfig>, z.input<typeof ModuleConfig>>;
 
 export const CONFIG_KEY = "io.element.element-web-modules.restricted-guests";
 
 declare module "@element-hq/element-web-module-api" {
     export interface Config {
-        [CONFIG_KEY]: ConfigSchema["_input"];
+        [CONFIG_KEY]: input<ConfigSchema>;
     }
 }