diff --git a/src/Pipedrive.net/Clients/FilesClient.cs b/src/Pipedrive.net/Clients/FilesClient.cs
index 041a6847..fa470c7a 100644
--- a/src/Pipedrive.net/Clients/FilesClient.cs
+++ b/src/Pipedrive.net/Clients/FilesClient.cs
@@ -81,6 +81,11 @@ public async Task<File> Create(NewFile data)
                 content.Add(new StringContent(data.NoteId.ToString()), "note_id");
             }
 
+            if (!string.IsNullOrEmpty(data.LeadId))
+            {
+                content.Add(new StringContent(data.LeadId), "lead_id");
+            }
+
             return await ApiConnection.Post<File>(ApiUrls.Files(), content, "application/json", "multipart/form-data");
         }
 
diff --git a/src/Pipedrive.net/Clients/ILeadsClient.cs b/src/Pipedrive.net/Clients/ILeadsClient.cs
index 82d7ba31..51d46b42 100644
--- a/src/Pipedrive.net/Clients/ILeadsClient.cs
+++ b/src/Pipedrive.net/Clients/ILeadsClient.cs
@@ -1,6 +1,7 @@
 using System;
 using System.Collections.Generic;
 using System.Threading.Tasks;
+using Pipedrive.Models.Response.Leads;
 
 namespace Pipedrive
 {
@@ -14,5 +15,7 @@ public interface ILeadsClient
         Task<IReadOnlyList<Lead>> GetAll(LeadFilters filters);
 
         Task<Lead> Get(Guid id);
+
+        Task<Lead> Create(NewLead newLead);
     }
 }
diff --git a/src/Pipedrive.net/Clients/LeadsClient.cs b/src/Pipedrive.net/Clients/LeadsClient.cs
index dd977db4..b5dce943 100644
--- a/src/Pipedrive.net/Clients/LeadsClient.cs
+++ b/src/Pipedrive.net/Clients/LeadsClient.cs
@@ -2,6 +2,7 @@
 using System.Collections.Generic;
 using System.Threading.Tasks;
 using Pipedrive.Helpers;
+using Pipedrive.Models.Response.Leads;
 
 namespace Pipedrive
 {
@@ -39,5 +40,10 @@ public Task<Lead> Get(Guid id)
         {
             return ApiConnection.Get<Lead>(ApiUrls.Lead(id));
         }
+
+        public Task<Lead> Create(NewLead newLead)
+        {
+            return ApiConnection.Post<Lead>(ApiUrls.Leads(), newLead);
+        }
     }
 }
diff --git a/src/Pipedrive.net/Models/Common/CustomFields/AddressCustomField.cs b/src/Pipedrive.net/Models/Common/CustomFields/AddressCustomField.cs
index 5d9ce3dd..26e334f6 100644
--- a/src/Pipedrive.net/Models/Common/CustomFields/AddressCustomField.cs
+++ b/src/Pipedrive.net/Models/Common/CustomFields/AddressCustomField.cs
@@ -49,5 +49,10 @@ public AddressCustomField(
             PostalCode = postalCode;
             FormattedAddress = formattedAddress;
         }
+
+        public override string ToString()
+        {
+            return FormattedAddress;
+        }
     }
 }
diff --git a/src/Pipedrive.net/Models/Common/CustomFields/DateCustomField.cs b/src/Pipedrive.net/Models/Common/CustomFields/DateCustomField.cs
index 62e9c684..ca66e4d5 100644
--- a/src/Pipedrive.net/Models/Common/CustomFields/DateCustomField.cs
+++ b/src/Pipedrive.net/Models/Common/CustomFields/DateCustomField.cs
@@ -10,5 +10,10 @@ public DateCustomField(DateTime value)
         {
             Value = value;
         }
+
+        public override string ToString()
+        {
+            return Value.ToString();
+        }
     }
 }
diff --git a/src/Pipedrive.net/Models/Common/CustomFields/DateRangeCustomField.cs b/src/Pipedrive.net/Models/Common/CustomFields/DateRangeCustomField.cs
index 8e7f59e8..0aadbd3e 100644
--- a/src/Pipedrive.net/Models/Common/CustomFields/DateRangeCustomField.cs
+++ b/src/Pipedrive.net/Models/Common/CustomFields/DateRangeCustomField.cs
@@ -13,5 +13,12 @@ public DateRangeCustomField(DateTime? startDate, DateTime? endDate)
             StartDate = startDate;
             EndDate = endDate;
         }
+
+        public override string ToString()
+        {
+            string startDateString = StartDate.HasValue ? StartDate.Value.ToString() : "-";
+            string endDateString = EndDate.HasValue ? EndDate.Value.ToString() : "-";
+            return $"{startDateString} to {endDateString}";
+        }
     }
 }
diff --git a/src/Pipedrive.net/Models/Common/CustomFields/DecimalCustomField.cs b/src/Pipedrive.net/Models/Common/CustomFields/DecimalCustomField.cs
index 3fd5bdb4..e0da9f43 100644
--- a/src/Pipedrive.net/Models/Common/CustomFields/DecimalCustomField.cs
+++ b/src/Pipedrive.net/Models/Common/CustomFields/DecimalCustomField.cs
@@ -8,5 +8,10 @@ public DecimalCustomField(decimal value)
         {
             Value = value;
         }
+
+        public override string ToString()
+        {
+            return Value.ToString();
+        }
     }
 }
diff --git a/src/Pipedrive.net/Models/Common/CustomFields/ICustomField.cs b/src/Pipedrive.net/Models/Common/CustomFields/ICustomField.cs
index ef57b579..19615e33 100644
--- a/src/Pipedrive.net/Models/Common/CustomFields/ICustomField.cs
+++ b/src/Pipedrive.net/Models/Common/CustomFields/ICustomField.cs
@@ -2,5 +2,6 @@
 {
     public interface ICustomField
     {
+        string ToString();
     }
 }
diff --git a/src/Pipedrive.net/Models/Common/CustomFields/LongCustomField.cs b/src/Pipedrive.net/Models/Common/CustomFields/LongCustomField.cs
index 07c3986a..bdcee047 100644
--- a/src/Pipedrive.net/Models/Common/CustomFields/LongCustomField.cs
+++ b/src/Pipedrive.net/Models/Common/CustomFields/LongCustomField.cs
@@ -9,5 +9,10 @@ public LongCustomField(long value)
         {
             Value = value;
         }
+
+        public override string ToString()
+        {
+            return Value.ToString();
+        }
     }
 }
diff --git a/src/Pipedrive.net/Models/Common/CustomFields/MonetaryCustomField.cs b/src/Pipedrive.net/Models/Common/CustomFields/MonetaryCustomField.cs
index 94c139df..85a36dad 100644
--- a/src/Pipedrive.net/Models/Common/CustomFields/MonetaryCustomField.cs
+++ b/src/Pipedrive.net/Models/Common/CustomFields/MonetaryCustomField.cs
@@ -11,5 +11,10 @@ public MonetaryCustomField(decimal value, string currency)
             Value = value;
             Currency = currency;
         }
+
+        public override string ToString()
+        {
+            return $"{Currency} {Value}";
+        }
     }
 }
diff --git a/src/Pipedrive.net/Models/Common/CustomFields/OrganizationCustomField.cs b/src/Pipedrive.net/Models/Common/CustomFields/OrganizationCustomField.cs
index 72567795..374a1505 100644
--- a/src/Pipedrive.net/Models/Common/CustomFields/OrganizationCustomField.cs
+++ b/src/Pipedrive.net/Models/Common/CustomFields/OrganizationCustomField.cs
@@ -21,5 +21,10 @@ public class OrganizationCustomField : ICustomField
 
         [JsonProperty("value")]
         public long Value { get; set; }
+
+        public override string ToString()
+        {
+            return Name;
+        }
     }
 }
diff --git a/src/Pipedrive.net/Models/Common/CustomFields/PersonCustomField.cs b/src/Pipedrive.net/Models/Common/CustomFields/PersonCustomField.cs
index 9e04740c..f60db001 100644
--- a/src/Pipedrive.net/Models/Common/CustomFields/PersonCustomField.cs
+++ b/src/Pipedrive.net/Models/Common/CustomFields/PersonCustomField.cs
@@ -1,4 +1,5 @@
 using System.Collections.Generic;
+using System.Linq;
 using Newtonsoft.Json;
 
 namespace Pipedrive.CustomFields
@@ -16,5 +17,10 @@ public class PersonCustomField : ICustomField
 
         [JsonProperty("value")]
         public long Value { get; set; }
+
+        public override string ToString()
+        {
+            return $"{Name}, <{string.Join(", ", Email.Select(e => e.Value))}>";
+        }
     }
 }
diff --git a/src/Pipedrive.net/Models/Common/CustomFields/StringCustomField.cs b/src/Pipedrive.net/Models/Common/CustomFields/StringCustomField.cs
index 1594694e..0ad61c9b 100644
--- a/src/Pipedrive.net/Models/Common/CustomFields/StringCustomField.cs
+++ b/src/Pipedrive.net/Models/Common/CustomFields/StringCustomField.cs
@@ -9,5 +9,10 @@ public StringCustomField(string value)
         {
             Value = value;
         }
+
+        public override string ToString()
+        {
+            return Value;
+        }
     }
 }
diff --git a/src/Pipedrive.net/Models/Common/CustomFields/TimeCustomField.cs b/src/Pipedrive.net/Models/Common/CustomFields/TimeCustomField.cs
index f9f0ea5e..3f5a4787 100644
--- a/src/Pipedrive.net/Models/Common/CustomFields/TimeCustomField.cs
+++ b/src/Pipedrive.net/Models/Common/CustomFields/TimeCustomField.cs
@@ -13,5 +13,10 @@ public TimeCustomField(TimeSpan value, int timezoneId)
             Value = value;
             TimezoneId = timezoneId;
         }
+
+        public override string ToString()
+        {
+            return Value.ToString();
+        }
     }
 }
diff --git a/src/Pipedrive.net/Models/Common/CustomFields/TimeRangeCustomField.cs b/src/Pipedrive.net/Models/Common/CustomFields/TimeRangeCustomField.cs
index bdfca8db..35a3df51 100644
--- a/src/Pipedrive.net/Models/Common/CustomFields/TimeRangeCustomField.cs
+++ b/src/Pipedrive.net/Models/Common/CustomFields/TimeRangeCustomField.cs
@@ -16,5 +16,10 @@ public TimeRangeCustomField(TimeSpan startTime, TimeSpan endTime, int timezoneId
             EndTime = endTime;
             TimezoneId = timezoneId;
         }
+
+        public override string ToString()
+        {
+            return $"{StartTime} to {EndTime}";
+        }
     }
 }
diff --git a/src/Pipedrive.net/Models/Common/CustomFields/UserCustomField.cs b/src/Pipedrive.net/Models/Common/CustomFields/UserCustomField.cs
index 7335264d..d2480f32 100644
--- a/src/Pipedrive.net/Models/Common/CustomFields/UserCustomField.cs
+++ b/src/Pipedrive.net/Models/Common/CustomFields/UserCustomField.cs
@@ -24,5 +24,10 @@ public class UserCustomField : ICustomField
 
         [JsonProperty("value")]
         public long Value { get; set; }
+
+        public override string ToString()
+        {
+            return $"{Name}, <{Email}>";
+        }
     }
 }
diff --git a/src/Pipedrive.net/Models/Request/Files/NewFile.cs b/src/Pipedrive.net/Models/Request/Files/NewFile.cs
index cfc98e36..ac6763a9 100644
--- a/src/Pipedrive.net/Models/Request/Files/NewFile.cs
+++ b/src/Pipedrive.net/Models/Request/Files/NewFile.cs
@@ -25,6 +25,9 @@ public class NewFile
         [JsonProperty("note_id")]
         public long? NoteId { get; set; }
 
+        [JsonProperty("lead_id")]
+        public string LeadId { get; set; }
+
         public NewFile(RawFile file)
         {
             this.File = file;
diff --git a/src/Pipedrive.net/Models/Request/Notes/NewNote.cs b/src/Pipedrive.net/Models/Request/Notes/NewNote.cs
index f9a11881..95aba047 100644
--- a/src/Pipedrive.net/Models/Request/Notes/NewNote.cs
+++ b/src/Pipedrive.net/Models/Request/Notes/NewNote.cs
@@ -25,6 +25,9 @@ public class NewNote
         [JsonProperty("pinned_to_person_flag")]
         public bool PinnedToPersonFlag { get; set; }
 
+        [JsonProperty("lead_id")]
+        public string LeadId { get; set; }
+
         public NewNote(string content)
         {
             Content = content;
diff --git a/src/Pipedrive.net/Models/Request/Persons/PersonUpdate.cs b/src/Pipedrive.net/Models/Request/Persons/PersonUpdate.cs
index 8d87baf0..0f83cf26 100644
--- a/src/Pipedrive.net/Models/Request/Persons/PersonUpdate.cs
+++ b/src/Pipedrive.net/Models/Request/Persons/PersonUpdate.cs
@@ -25,6 +25,9 @@ public class PersonUpdate : IEntityWithCustomFields
         [JsonProperty("visible_to")]
         public Visibility VisibleTo { get; set; }
 
+        [JsonProperty("marketing_status")]
+        public string MarketingStatus { get; set; }
+
         [JsonIgnore]
         public IDictionary<string, ICustomField> CustomFields { get; set; }
     }
diff --git a/src/Pipedrive.net/Models/Response/Leads/NewLead.cs b/src/Pipedrive.net/Models/Response/Leads/NewLead.cs
new file mode 100644
index 00000000..d67eb538
--- /dev/null
+++ b/src/Pipedrive.net/Models/Response/Leads/NewLead.cs
@@ -0,0 +1,87 @@
+using System;
+using System.Collections.Generic;
+using System.Text;
+using Newtonsoft.Json;
+
+namespace Pipedrive.Models.Response.Leads
+{
+    /// <summary>
+    /// https://developers.pipedrive.com/docs/api/v1/Leads#addLead
+    /// </summary>
+    /*
+     {
+          "title": "<string>",
+          "owner_id": "<integer>",
+          "label_ids": [
+            "<uuid>",
+            "<uuid>"
+          ],
+          "person_id": "<integer>",
+          "organization_id": "<integer>",
+          "value": {
+            "amount": "<number>",
+            "currency": "<string>"
+          },
+          "expected_close_date": "<date>",
+          "visible_to": "<string>",
+          "was_seen": "<boolean>"
+     }
+     */
+    public class NewLead
+    {
+        [JsonProperty("title")]
+        public string Title { get; set; }
+
+        [JsonProperty("owner_id")]
+        public long OwnerId { get; set; }
+
+        [JsonIgnore]
+        [JsonProperty("creator_id")]
+        public long CreatorId { get; set; }
+
+        [JsonProperty("label_ids")]
+        public List<Guid> LabelIds { get; set; }
+
+        [JsonIgnore]
+        [JsonProperty("value")]
+        public CurrencyAmount Value { get; set; }
+
+        [JsonIgnore]
+        [JsonProperty("expected_close_date")]
+        public DateTime? ExpectedCloseDate { get; set; }
+
+        [JsonIgnore]
+        [JsonProperty("note")]
+        public string Note { get; set; }
+
+        [JsonProperty("person_id")]
+        public long PersonId { get; set; }
+
+        [JsonProperty("organization_id")]
+        public long? OrganizationId { get; set; }
+
+        [JsonIgnore]
+        [JsonProperty("is_archived")]
+        public bool IsArchived { get; set; }
+
+        [JsonIgnore]
+        [JsonProperty("source_name")]
+        public string SourceName { get; set; }
+
+        [JsonIgnore]
+        [JsonProperty("was_seen")]
+        public bool WasSeen { get; set; }
+
+        [JsonIgnore]
+        [JsonProperty("next_activity_id")]
+        public long? NextActivityId { get; set; }
+
+        [JsonIgnore]
+        [JsonProperty("add_time")]
+        public DateTime? AddTime { get; set; }
+
+        [JsonIgnore]
+        [JsonProperty("update_time")]
+        public DateTime? UpdateTime { get; set; }
+    }
+}
diff --git a/src/Pipedrive.net/Models/Response/Persons/AbstractPerson.cs b/src/Pipedrive.net/Models/Response/Persons/AbstractPerson.cs
index 463fcb95..c45b9d2a 100644
--- a/src/Pipedrive.net/Models/Response/Persons/AbstractPerson.cs
+++ b/src/Pipedrive.net/Models/Response/Persons/AbstractPerson.cs
@@ -142,5 +142,8 @@ public abstract class AbstractPerson<TUser, TOrganization, TPicture>
 
         [JsonProperty("cc_email")]
         public string CcEmail { get; set; }
+
+        [JsonProperty("marketing_status")]
+        public string MarketingStatus { get; set; }
     }
 }
diff --git a/src/Pipedrive.net/Models/Response/Persons/Person.cs b/src/Pipedrive.net/Models/Response/Persons/Person.cs
index fe6c8be8..905057b5 100644
--- a/src/Pipedrive.net/Models/Response/Persons/Person.cs
+++ b/src/Pipedrive.net/Models/Response/Persons/Person.cs
@@ -21,7 +21,8 @@ public PersonUpdate ToUpdate()
                 OrgId = OrgId?.Value,
                 OwnerId = OwnerId?.Value,
                 VisibleTo = VisibleTo,
-                CustomFields = CustomFields
+                CustomFields = CustomFields,
+                MarketingStatus = MarketingStatus
             };
         }
     }
diff --git a/src/Pipedrive.net/Pipedrive.csproj b/src/Pipedrive.net/Pipedrive.csproj
index 1d352843..bf92b858 100644
--- a/src/Pipedrive.net/Pipedrive.csproj
+++ b/src/Pipedrive.net/Pipedrive.csproj
@@ -29,7 +29,7 @@
       <PrivateAssets>all</PrivateAssets>
       <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
     </PackageReference>
-    <PackageReference Include="Newtonsoft.Json" Version="11.0.2" />
+    <PackageReference Include="Newtonsoft.Json" Version="13.0.3" />
     <PackageReference Include="StyleCop.Analyzers" Version="1.1.118">
       <PrivateAssets>all</PrivateAssets>
       <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>