diff --git a/CHANGELOG.md b/CHANGELOG.md
index fbb9d3c..de0c12c 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,10 +1,14 @@
 ## 2.1.0
 
 - Check if COM is disconnected when use `isOpened`.
-## 2.0.2
+## 2.1.1
 
 - fix setCommState Error
 
+## 2.1.0
+
+- update dependencies
+
 ## 2.0.1
 
 - add lints to dev dependencies
diff --git a/example/pubspec.lock b/example/pubspec.lock
index c1e4ab7..a691f02 100644
--- a/example/pubspec.lock
+++ b/example/pubspec.lock
@@ -265,7 +265,7 @@ packages:
       path: ".."
       relative: true
     source: path
-    version: "2.0.2"
+    version: "2.1.1"
   shelf:
     dependency: transitive
     description:
diff --git a/lib/src/serial_port.dart b/lib/src/serial_port.dart
index f8d2a32..79aea71 100644
--- a/lib/src/serial_port.dart
+++ b/lib/src/serial_port.dart
@@ -10,22 +10,6 @@ enum StringConverter {
   ANSI,
 }
 
-typedef ThreadProcNative = Int Function();
-
-base class DEV_BROADCAST_PORT_ extends Struct {
-  @Uint32()
-  external int dbcp_size;
-
-  @Uint32()
-  external int dbcp_devicetype;
-
-  @Uint32()
-  external int dbcp_reserved;
-
-  @Array(1)
-  external Array<Uint16> _dbcc_name;
-}
-
 class SerialPort {
   /// [portName] like COM3
   final String portName;
diff --git a/pubspec.yaml b/pubspec.yaml
index 8a3c02e..882f52d 100644
--- a/pubspec.yaml
+++ b/pubspec.yaml
@@ -1,6 +1,6 @@
 name: serial_port_win32
 description: A SerialPort library using win32 API, for connecting real device by serial port. Only supports Windows.
-version: 2.0.2
+version: 2.1.1
 homepage: https://github.com/FengChendian/serial_port_win32
 repository: https://github.com/FengChendian/serial_port_win32
 issue_tracker: https://github.com/FengChendian/serial_port_win32/issues