diff --git a/test/XUnitTest/XUnitTest.csproj b/test/XUnitTest/XUnitTest.csproj
index ba5dd01..f5cf110 100644
--- a/test/XUnitTest/XUnitTest.csproj
+++ b/test/XUnitTest/XUnitTest.csproj
@@ -7,7 +7,7 @@
   </PropertyGroup>
 
   <ItemGroup>
-    <PackageReference Include="MessagePack" Version="2.3.85" />
+    <PackageReference Include="MessagePack" Version="2.5.187" />
     <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.0.0" />
     <PackageReference Include="System.Collections.Concurrent" Version="4.3.0" />
     <PackageReference Include="xunit" Version="2.4.1" />