THRIFT-5479 Add net 6 support
diff --git a/lib/netstd/Tests/Thrift.Tests/Thrift.Tests.csproj b/lib/netstd/Tests/Thrift.Tests/Thrift.Tests.csproj
index 18fce01..38a6a5c 100644
--- a/lib/netstd/Tests/Thrift.Tests/Thrift.Tests.csproj
+++ b/lib/netstd/Tests/Thrift.Tests/Thrift.Tests.csproj
@@ -21,6 +21,7 @@
   <PropertyGroup>
     <TargetFramework>net6.0</TargetFramework>
     <Version>0.16.0.0</Version>
+    <Nullable>enable</Nullable>
   </PropertyGroup>
 
   <ItemGroup>