diff --git a/docs/en/14-reference/05-connector/40-csharp.md b/docs/en/14-reference/05-connector/40-csharp.md
index c9c9f95228e5..01f4f0e81d32 100644
--- a/docs/en/14-reference/05-connector/40-csharp.md
+++ b/docs/en/14-reference/05-connector/40-csharp.md
@@ -23,13 +23,14 @@ import RequestId from "../../assets/resources/_request_id.mdx";
 
 ## Version History
 
-| Connector Version | Major Changes                                     | TDengine Version   |
-|------------------|-------------------------------------------------|-------------------|
-| 3.1.4             | Improved WebSocket query and insert performance. | 3.3.2.0 and higher |
-| 3.1.3             | Supported WebSocket auto-reconnect.              | -                  |
-| 3.1.2             | Fixed schemaless resource release.               | -                  |
-| 3.1.1             | Supported varbinary and geometry types.          | -                  |
-| 3.1.0             | WebSocket uses a native C# implementation.       | 3.2.1.0 and higher |
+| Connector Version | Major Changes                                              | TDengine Version   |
+|-------------------|------------------------------------------------------------|--------------------|
+| 3.1.5             | Fix WebSocket encoding error for Chinese character length. | -                  |
+| 3.1.4             | Improved WebSocket query and insert performance.           | 3.3.2.0 and higher |
+| 3.1.3             | Supported WebSocket auto-reconnect.                        | -                  |
+| 3.1.2             | Fixed schemaless resource release.                         | -                  |
+| 3.1.1             | Supported varbinary and geometry types.                    | -                  |
+| 3.1.0             | WebSocket uses a native C# implementation.                 | 3.2.1.0 and higher |
 
 ## Exceptions and Error Codes
 
diff --git a/docs/zh/14-reference/05-connector/40-csharp.mdx b/docs/zh/14-reference/05-connector/40-csharp.mdx
index f5f2d9186302..f58b243689ae 100644
--- a/docs/zh/14-reference/05-connector/40-csharp.mdx
+++ b/docs/zh/14-reference/05-connector/40-csharp.mdx
@@ -24,6 +24,7 @@ import RequestId from "./_request_id.mdx";
 
 | Connector 版本 | 主要变化                       | TDengine 版本   |
 |:-------------|:---------------------------|:--------------|
+| 3.1.5        | 修复 websocket 协议编码中文时长度错误   | -             |
 | 3.1.4        | 提升 websocket 查询和写入性能       | 3.3.2.0 及更高版本 |
 | 3.1.3        | 支持 WebSocket 自动重连          | -             |
 | 3.1.2        | 修复 schemaless 资源释放         | -             |