diff --git a/src/NetEvolve.ArchiDuct/Models/Architecture.cs b/src/NetEvolve.ArchiDuct/Models/Architecture.cs
index e2e27879..974f2a8f 100644
--- a/src/NetEvolve.ArchiDuct/Models/Architecture.cs
+++ b/src/NetEvolve.ArchiDuct/Models/Architecture.cs
@@ -4,7 +4,7 @@
 using NetEvolve.ArchiDuct.Abstractions;
 using static System.StringComparer;
 
-internal class Architecture : IArchitecture
+internal sealed class Architecture : IArchitecture
 {
     private readonly AssemblyDictionary _assemblies;
     private readonly MembersDictionary _members;