diff --git a/Build/adapters/csharp/Saikuro/src/Saikuro.csproj b/Build/adapters/csharp/Saikuro/src/Saikuro.csproj
index 8a34a99..3584e6d 100644
--- a/Build/adapters/csharp/Saikuro/src/Saikuro.csproj
+++ b/Build/adapters/csharp/Saikuro/src/Saikuro.csproj
@@ -29,7 +29,7 @@
   </PropertyGroup>
 
   <ItemGroup>
-    <PackageReference Include="MessagePack" Version="3.1.4" />
+    <PackageReference Include="MessagePack" Version="3.1.7" />
     <PackageReference Include="System.IO.Pipelines" Version="10.0.3" />
     <PackageReference Include="Microsoft.Extensions.Logging.Abstractions" Version="8.0.2" />
   </ItemGroup>
diff --git a/Build/adapters/csharp/Saikuro/tests/Saikuro.Tests.csproj b/Build/adapters/csharp/Saikuro/tests/Saikuro.Tests.csproj
index fb286a5..d53c867 100644
--- a/Build/adapters/csharp/Saikuro/tests/Saikuro.Tests.csproj
+++ b/Build/adapters/csharp/Saikuro/tests/Saikuro.Tests.csproj
@@ -11,6 +11,8 @@
   <ItemGroup>
     <PackageReference Include="coverlet.collector" Version="6.0.0" />
     <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.8.0" />
+    <PackageReference Include="System.Net.Http" Version="4.3.4" />
+    <PackageReference Include="System.Text.RegularExpressions" Version="4.3.1" />
     <PackageReference Include="xunit" Version="2.5.3" />
     <PackageReference Include="xunit.runner.visualstudio" Version="2.5.3" />
   </ItemGroup>