diff --git a/src/SKIT.FlurlHttpClient.Wechat.Api/Events/MpMessage/VoiceMessageEvent.cs b/src/SKIT.FlurlHttpClient.Wechat.Api/Events/MpMessage/VoiceMessageEvent.cs
index 41a95a78..887cfc93 100644
--- a/src/SKIT.FlurlHttpClient.Wechat.Api/Events/MpMessage/VoiceMessageEvent.cs
+++ b/src/SKIT.FlurlHttpClient.Wechat.Api/Events/MpMessage/VoiceMessageEvent.cs
@@ -33,6 +33,14 @@ namespace SKIT.FlurlHttpClient.Wechat.Api.Events
         [System.Xml.Serialization.XmlElement("MediaId")]
         public string MediaId { get; set; } = default!;
 
+        /// <summary>
+        /// 获取或设置 16K 采样率的语音消息 MediaId。
+        /// </summary>
+        [Newtonsoft.Json.JsonProperty("MediaId16K")]
+        [System.Text.Json.Serialization.JsonPropertyName("MediaId16K")]
+        [System.Xml.Serialization.XmlElement("MediaId16K", IsNullable = true)]
+        public string? MediaId16K { get; set; }
+
         /// <summary>
         /// 获取或设置消息数据 ID。
         /// </summary>