diff --git a/src/SerialPortRx/SerialPortRx.csproj b/src/SerialPortRx/SerialPortRx.csproj
index 785f062..b5c8dfe 100644
--- a/src/SerialPortRx/SerialPortRx.csproj
+++ b/src/SerialPortRx/SerialPortRx.csproj
@@ -1,4 +1,4 @@
-<Project Sdk="Microsoft.NET.Sdk">
+<Project Sdk="Microsoft.NET.Sdk">
   <PropertyGroup>
     <TargetFrameworks>netstandard2.0;net6.0;net7.0;net6.0-windows10.0.17763.0;net7.0-windows10.0.17763.0</TargetFrameworks>
   </PropertyGroup>
@@ -6,7 +6,7 @@
     <DefineConstants>HasWindows</DefineConstants>
   </PropertyGroup>
   <ItemGroup>
-    <PackageReference Include="System.Reactive" Version="5.0.0" />
+    <PackageReference Include="System.Reactive" Version="6.0.0" />
     <PackageReference Include="System.IO.Ports" Version="7.0.0" />
   </ItemGroup>