diff --git a/hassio/src/addon-view/config/hassio-addon-config.ts b/hassio/src/addon-view/config/hassio-addon-config.ts
index 52c3d73930..273bca178b 100644
--- a/hassio/src/addon-view/config/hassio-addon-config.ts
+++ b/hassio/src/addon-view/config/hassio-addon-config.ts
@@ -3,6 +3,7 @@ import { ActionDetail } from "@material/mwc-list";
 import "@material/mwc-list/mwc-list-item";
 import { mdiDotsVertical } from "@mdi/js";
 import "@polymer/iron-autogrow-textarea/iron-autogrow-textarea";
+import { DEFAULT_SCHEMA, Type } from "js-yaml";
 import {
   css,
   CSSResultGroup,
@@ -11,7 +12,7 @@ import {
   PropertyValues,
   TemplateResult,
 } from "lit";
-import { customElement, property, state, query } from "lit/decorators";
+import { customElement, property, query, state } from "lit/decorators";
 import memoizeOne from "memoize-one";
 import { fireEvent } from "../../../../src/common/dom/fire_event";
 import "../../../../src/components/buttons/ha-progress-button";
@@ -27,6 +28,7 @@ import {
   HassioAddonDetails,
   HassioAddonSetOptionParams,
   setHassioAddonOption,
+  validateHassioAddonOption,
 } from "../../../../src/data/hassio/addon";
 import { extractApiErrorMessage } from "../../../../src/data/hassio/common";
 import { Supervisor } from "../../../../src/data/supervisor/supervisor";
@@ -38,6 +40,13 @@ import { hassioStyle } from "../../resources/hassio-style";
 
 const SUPPORTED_UI_TYPES = ["string", "select", "boolean", "integer", "float"];
 
+const ADDON_YAML_SCHEMA = DEFAULT_SCHEMA.extend([
+  new Type("!secret", {
+    kind: "scalar",
+    construct: (data) => `!secret ${data}`,
+  }),
+]);
+
 @customElement("hassio-addon-config")
 class HassioAddonConfig extends LitElement {
   @property({ attribute: false }) public addon!: HassioAddonDetails;
@@ -125,6 +134,7 @@ class HassioAddonConfig extends LitElement {
               ></ha-form>`
             : html` <ha-yaml-editor
                 @value-changed=${this._configChanged}
+                .schema=${ADDON_YAML_SCHEMA}
               ></ha-yaml-editor>`}
           ${this._error ? html` <div class="errors">${this._error}</div> ` : ""}
           ${!this._yamlMode ||
@@ -269,6 +279,14 @@ class HassioAddonConfig extends LitElement {
     this._error = undefined;
 
     try {
+      const validation = await validateHassioAddonOption(
+        this.hass,
+        this.addon.slug,
+        this._editor?.value
+      );
+      if (!validation.valid) {
+        throw Error(validation.message);
+      }
       await setHassioAddonOption(this.hass, this.addon.slug, {
         options: this._yamlMode ? this._editor?.value : this._options,
       });
diff --git a/src/components/ha-yaml-editor.ts b/src/components/ha-yaml-editor.ts
index 8d79034c3e..8ff961aa10 100644
--- a/src/components/ha-yaml-editor.ts
+++ b/src/components/ha-yaml-editor.ts
@@ -1,4 +1,4 @@
-import { dump, load } from "js-yaml";
+import { DEFAULT_SCHEMA, dump, load, Schema } from "js-yaml";
 import { html, LitElement, TemplateResult } from "lit";
 import { customElement, property, state } from "lit/decorators";
 import { fireEvent } from "../common/dom/fire_event";
@@ -20,6 +20,8 @@ const isEmpty = (obj: Record<string, unknown>): boolean => {
 export class HaYamlEditor extends LitElement {
   @property() public value?: any;
 
+  @property({ attribute: false }) public yamlSchema: Schema = DEFAULT_SCHEMA;
+
   @property() public defaultValue?: any;
 
   @property() public isValid = true;
@@ -30,7 +32,10 @@ export class HaYamlEditor extends LitElement {
 
   public setValue(value): void {
     try {
-      this._yaml = value && !isEmpty(value) ? dump(value) : "";
+      this._yaml =
+        value && !isEmpty(value)
+          ? dump(value, { schema: this.yamlSchema })
+          : "";
     } catch (err) {
       // eslint-disable-next-line no-console
       console.error(err, value);
@@ -67,7 +72,7 @@ export class HaYamlEditor extends LitElement {
 
     if (this._yaml) {
       try {
-        parsed = load(this._yaml);
+        parsed = load(this._yaml, { schema: this.yamlSchema });
       } catch (err) {
         // Invalid YAML
         isValid = false;
diff --git a/src/data/hassio/addon.ts b/src/data/hassio/addon.ts
index 902bd88816..c2e43ac046 100644
--- a/src/data/hassio/addon.ts
+++ b/src/data/hassio/addon.ts
@@ -212,13 +212,15 @@ export const setHassioAddonOption = async (
 
 export const validateHassioAddonOption = async (
   hass: HomeAssistant,
-  slug: string
+  slug: string,
+  data?: any
 ): Promise<{ message: string; valid: boolean }> => {
   if (atLeastVersion(hass.config.version, 2021, 2, 4)) {
     return hass.callWS({
       type: "supervisor/api",
       endpoint: `/addons/${slug}/options/validate`,
       method: "post",
+      data,
     });
   }