diff --git a/DelauneyTriangulation/DelauneyTriangulation.csproj b/DelauneyTriangulation/DelauneyTriangulation.csproj
index cd441fd..3167291 100644
--- a/DelauneyTriangulation/DelauneyTriangulation.csproj
+++ b/DelauneyTriangulation/DelauneyTriangulation.csproj
@@ -6,6 +6,7 @@
         <BuiltInComInteropSupport>true</BuiltInComInteropSupport>
         <ApplicationManifest>app.manifest</ApplicationManifest>
         <AvaloniaUseCompiledBindingsByDefault>true</AvaloniaUseCompiledBindingsByDefault>
+        <LangVersion>preview</LangVersion>
     </PropertyGroup>
 
     <ItemGroup>