diff --git a/servers/dotnet/extensions/PlayHouse.Extensions.MessagePack/PlayHouse.Extensions.MessagePack.csproj b/servers/dotnet/extensions/PlayHouse.Extensions.MessagePack/PlayHouse.Extensions.MessagePack.csproj
index 29f4a18..ee16133 100644
--- a/servers/dotnet/extensions/PlayHouse.Extensions.MessagePack/PlayHouse.Extensions.MessagePack.csproj
+++ b/servers/dotnet/extensions/PlayHouse.Extensions.MessagePack/PlayHouse.Extensions.MessagePack.csproj
@@ -6,7 +6,7 @@
   </PropertyGroup>
 
   <ItemGroup>
-    <PackageReference Include="MessagePack" Version="2.5.140" />
+    <PackageReference Include="MessagePack" Version="3.1.4" />
   </ItemGroup>
 
   <ItemGroup>