diff --git a/MessagePack.NodaTime.Tests/MessagePack.NodaTime.Tests.csproj b/MessagePack.NodaTime.Tests/MessagePack.NodaTime.Tests.csproj
index 324c8d5..850d073 100644
--- a/MessagePack.NodaTime.Tests/MessagePack.NodaTime.Tests.csproj
+++ b/MessagePack.NodaTime.Tests/MessagePack.NodaTime.Tests.csproj
@@ -15,7 +15,7 @@
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+      <Version>2.6.4</Version>
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     <PackageReference Include="xunit.runner.visualstudio">
       <Version>2.5.4</Version>