diff --git a/SerialPortRx/SerialPortRx.csproj b/SerialPortRx/SerialPortRx.csproj
index 1c98585..360de5d 100644
--- a/SerialPortRx/SerialPortRx.csproj
+++ b/SerialPortRx/SerialPortRx.csproj
@@ -3,7 +3,7 @@
   <ItemGroup>
     <Compile Update="**\*.cs" DependentUpon="I%(Filename).cs" />
     <PackageReference Include="System.Reactive" Version="5.0.0" />
-    <PackageReference Include="System.IO.Ports" Version="5.0.1" />
+    <PackageReference Include="System.IO.Ports" Version="6.0.0" />
   </ItemGroup>
 
 </Project>