diff --git a/Company.Domain/InstitutionContractAmendmentTempAgg/InstitutionContractAmendmentTemp.cs b/Company.Domain/InstitutionContractAmendmentTempAgg/InstitutionContractAmendmentTemp.cs
index 02925e68..7c13616a 100644
--- a/Company.Domain/InstitutionContractAmendmentTempAgg/InstitutionContractAmendmentTemp.cs
+++ b/Company.Domain/InstitutionContractAmendmentTempAgg/InstitutionContractAmendmentTemp.cs
@@ -1,6 +1,7 @@
 using System;
 using System.Collections.Generic;
 using System.Linq;
+using MongoDB.Bson;
 using MongoDB.Bson.Serialization.Attributes;
 
 namespace Company.Domain.InstitutionContractAmendmentTempAgg;
@@ -19,7 +20,9 @@ public class InstitutionContractAmendmentTemp
         InstitutionContractId = institutionContractId;
     }
 
-    [BsonId] public Guid Id { get; private set; }
+    [BsonId]
+    [BsonRepresentation(BsonType.String)]
+    public Guid Id { get; private set; }
     public List<InstitutionContractAmendmentTempPrevWorkshop> PrevWorkshops { get; private set; }
     public List<InstitutionContractAmendmentTempNewWorkshop> NewWorkshops { get; private set; }
     public long InstitutionContractId { get; private set; }