diff --git a/ValueOf/IValueOf.cs b/ValueOf/IValueOf.cs
new file mode 100644
index 0000000..b457eae
--- /dev/null
+++ b/ValueOf/IValueOf.cs
@@ -0,0 +1,11 @@
+namespace ValueOf
+{
+    public interface IValueOf<TValue, TThis>
+    {
+        static abstract TThis From(TValue item);
+        TValue Value { get; }
+        bool Equals(object obj);
+        int GetHashCode();
+        string ToString();
+    }
+}
\ No newline at end of file
diff --git a/ValueOf/ValueOf.cs b/ValueOf/ValueOf.cs
index b707102..01b2d10 100644
--- a/ValueOf/ValueOf.cs
+++ b/ValueOf/ValueOf.cs
@@ -1,4 +1,4 @@
-using System;
+using System;
 using System.Collections.Generic;
 using System.Linq;
 using System.Linq.Expressions;
@@ -6,7 +6,7 @@
 
 namespace ValueOf
 {
-    public class ValueOf<TValue, TThis> where TThis : ValueOf<TValue, TThis>, new()
+    public class ValueOf<TValue, TThis> : IValueOf<TValue, TThis> where TThis : ValueOf<TValue, TThis>, new()
     {
         private static readonly Func<TThis> Factory;
 
diff --git a/ValueOf/ValueOf.csproj b/ValueOf/ValueOf.csproj
index 157e4c7..6c018ec 100644
--- a/ValueOf/ValueOf.csproj
+++ b/ValueOf/ValueOf.csproj
@@ -1,7 +1,8 @@
-<Project Sdk="Microsoft.NET.Sdk">
+<Project Sdk="Microsoft.NET.Sdk">
 
   <PropertyGroup>
-    <TargetFrameworks>net451;netcoreapp1.1;netstandard1.3</TargetFrameworks>
+    <TargetFrameworks>net6.0</TargetFrameworks>
+    <LangVersion>preview</LangVersion>
     <Authors>Harry McIntyre</Authors>
     <Title>ValueOf - Easy 'One-Liner' Value Objects for c#. Get over your Primitive Obsession!</Title>
     <Company>Harry McIntyre</Company>