diff --git a/src/SKIT.FlurlHttpClient.Wechat.Api/Extensions/WechatApiClientExecuteCardExtensions.cs b/src/SKIT.FlurlHttpClient.Wechat.Api/Extensions/WechatApiClientExecuteCardExtensions.cs
index 12f52db0..e9ed8e79 100644
--- a/src/SKIT.FlurlHttpClient.Wechat.Api/Extensions/WechatApiClientExecuteCardExtensions.cs
+++ b/src/SKIT.FlurlHttpClient.Wechat.Api/Extensions/WechatApiClientExecuteCardExtensions.cs
@@ -981,6 +981,26 @@ namespace SKIT.FlurlHttpClient.Wechat.Api
             return await client.SendRequestWithJsonAsync<Models.CardSubMerchantSubmitResponse>(flurlReq, data: request, cancellationToken: cancellationToken);
         }
 
+        /// <summary>
+        /// <para>异步调用 [POST] /card/submerchant/update 接口。</para>
+        /// <para>REF: https://developers.weixin.qq.com/doc/offiaccount/Cards_and_Offer/Third-party_developer_mode.html#1 </para>
+        /// </summary>
+        /// <param name="client"></param>
+        /// <param name="request"></param>
+        /// <param name="cancellationToken"></param>
+        /// <returns></returns>
+        public static async Task<Models.CardSubMerchantUpdateResponse> ExecuteCardSubMerchantUpdateAsync(this WechatApiClient client, Models.CardSubMerchantUpdateRequest request, CancellationToken cancellationToken = default)
+        {
+            if (client is null) throw new ArgumentNullException(nameof(client));
+            if (request is null) throw new ArgumentNullException(nameof(request));
+
+            IFlurlRequest flurlReq = client
+                .CreateRequest(request, HttpMethod.Post, "card", "submerchant", "update")
+                .SetQueryParam("access_token", request.AccessToken);
+
+            return await client.SendRequestWithJsonAsync<Models.CardSubMerchantUpdateResponse>(flurlReq, data: request, cancellationToken: cancellationToken);
+        }
+
         /// <summary>
         /// <para>异步调用 [GET] /card/getapplyprotocol 接口。</para>
         /// <para>REF: https://developers.weixin.qq.com/doc/offiaccount/Cards_and_Offer/Third-party_developer_mode.html#3 </para>