diff --git a/MockTraceAgent.Core/MockTraceAgent.Core.csproj b/MockTraceAgent.Core/MockTraceAgent.Core.csproj
index 5aca840..6c71a75 100644
--- a/MockTraceAgent.Core/MockTraceAgent.Core.csproj
+++ b/MockTraceAgent.Core/MockTraceAgent.Core.csproj
@@ -7,7 +7,7 @@
   </PropertyGroup>
 
   <ItemGroup>
-    <PackageReference Include="MessagePack" Version="2.5.198" />
+    <PackageReference Include="MessagePack" Version="3.1.4" />
   </ItemGroup>
 
 </Project>
diff --git a/MockTraceAgent.Web/MockTraceAgent.Web.csproj b/MockTraceAgent.Web/MockTraceAgent.Web.csproj
index f8dd5a9..2c60413 100644
--- a/MockTraceAgent.Web/MockTraceAgent.Web.csproj
+++ b/MockTraceAgent.Web/MockTraceAgent.Web.csproj
@@ -8,7 +8,7 @@
   </PropertyGroup>
 
   <ItemGroup>
-    <PackageReference Include="MessagePack" Version="2.5.198" />
+    <PackageReference Include="MessagePack" Version="3.1.4" />
   </ItemGroup>
 
   <ItemGroup>