diff --git a/libraries/botframework-connector/src/connectorApi/models/mappers.ts b/libraries/botframework-connector/src/connectorApi/models/mappers.ts
index 559bb2a97b..b6b104410b 100644
--- a/libraries/botframework-connector/src/connectorApi/models/mappers.ts
+++ b/libraries/botframework-connector/src/connectorApi/models/mappers.ts
@@ -158,6 +158,12 @@ export const ChannelAccount: CompositeMapper = {
         type: {
           name: "String"
         }
+      },
+      properties: {
+        serializedName: "properties",
+        type: {
+          name: "Object"
+        }
       }
     }
   }
diff --git a/libraries/botframework-schema/etc/botframework-schema.api.md b/libraries/botframework-schema/etc/botframework-schema.api.md
index f790bdef6c..f41816f47e 100644
--- a/libraries/botframework-schema/etc/botframework-schema.api.md
+++ b/libraries/botframework-schema/etc/botframework-schema.api.md
@@ -579,6 +579,7 @@ export interface ChannelAccount {
     aadObjectId?: string;
     id: string;
     name: string;
+    properties?: any;
     role?: RoleTypes | string;
 }
 
diff --git a/libraries/botframework-schema/src/index.ts b/libraries/botframework-schema/src/index.ts
index 019813f808..f98e101ec7 100644
--- a/libraries/botframework-schema/src/index.ts
+++ b/libraries/botframework-schema/src/index.ts
@@ -155,6 +155,11 @@ export interface ChannelAccount {
      * 'user', 'bot', 'skill'
      */
     role?: RoleTypes | string;
+
+    /**
+     * Custom properties object (optional)
+     */
+    properties?: any; // eslint-disable-line @typescript-eslint/no-explicit-any
 }
 
 const channelAccount = z.object({