diff --git a/MessagePack.NodaTime.Tests/MessagePack.NodaTime.Tests.csproj b/MessagePack.NodaTime.Tests/MessagePack.NodaTime.Tests.csproj
index c549622..bb8eda3 100644
--- a/MessagePack.NodaTime.Tests/MessagePack.NodaTime.Tests.csproj
+++ b/MessagePack.NodaTime.Tests/MessagePack.NodaTime.Tests.csproj
@@ -12,7 +12,7 @@
       <Version>3.5.1</Version>
     </PackageReference>
     <PackageReference Include="MSTest.TestFramework">
-      <Version>3.2.2</Version>
+      <Version>3.5.1</Version>
     </PackageReference>
     <PackageReference Include="xunit">
       <Version>2.9.0</Version>