diff --git a/EnvelopeGenerator.Application/Common/Dto/EnvelopeTypeDto.cs b/EnvelopeGenerator.Application/Common/Dto/EnvelopeTypeDto.cs
index 1246402b..f6cb3eba 100644
--- a/EnvelopeGenerator.Application/Common/Dto/EnvelopeTypeDto.cs
+++ b/EnvelopeGenerator.Application/Common/Dto/EnvelopeTypeDto.cs
@@ -80,5 +80,5 @@ public class EnvelopeTypeDto
     /// <summary>
     /// Gets or sets the contract type associated with the envelope type.
     /// </summary>
-    public int? ContractType { get; set; }
+    public ContractType? ContractType { get; set; }
 }
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