diff --git a/DicomTypeTranslation/DicomTypeTranslation.csproj b/DicomTypeTranslation/DicomTypeTranslation.csproj
index 03cd13e..cb9ea9d 100644
--- a/DicomTypeTranslation/DicomTypeTranslation.csproj
+++ b/DicomTypeTranslation/DicomTypeTranslation.csproj
@@ -35,6 +35,6 @@
     <PackageReference Include="MongoDB.Driver" Version="2.27.0" />
     <PackageReference Include="Newtonsoft.Json" Version="13.0.3" />
     <PackageReference Include="NLog" Version="5.3.2" />
-    <PackageReference Include="YamlDotNet" Version="15.3.0" />
+    <PackageReference Include="YamlDotNet" Version="16.0.0" />
   </ItemGroup>
 </Project>
diff --git a/DicomTypeTranslation/TableCreation/SystemTypeTypeConverter.cs b/DicomTypeTranslation/TableCreation/SystemTypeTypeConverter.cs
index 281fcea..880c9ad 100644
--- a/DicomTypeTranslation/TableCreation/SystemTypeTypeConverter.cs
+++ b/DicomTypeTranslation/TableCreation/SystemTypeTypeConverter.cs
@@ -5,22 +5,22 @@
 
 namespace DicomTypeTranslation.TableCreation;
 
-internal class SystemTypeTypeConverter : IYamlTypeConverter
+internal sealed class SystemTypeTypeConverter : IYamlTypeConverter
 {
     public bool Accepts(Type type)
     {
         return typeof(Type).IsAssignableFrom(type);
     }
 
-    public object ReadYaml(IParser parser, Type type)
+    public object ReadYaml(IParser parser, Type type, ObjectDeserializer _)
     {
         var scalar = parser.Consume<Scalar>();
         return Type.GetType(scalar.Value);
     }
 
-    public void WriteYaml(IEmitter emitter, object value, Type type)
+    public void WriteYaml(IEmitter emitter, object value, Type _1, ObjectSerializer _2)
     {
-        var typeName = ((Type)value).FullName;
+        var typeName = (value as Type)?.FullName ?? throw new ArgumentException("SytemTypeTypeConverter.WriteYaml called with non-Type argument",nameof(value));
         emitter.Emit(new Scalar(typeName));
     }
 }
\ No newline at end of file