diff --git a/src/Twilio.AspNet.Common/SmsRequest.cs b/src/Twilio.AspNet.Common/SmsRequest.cs
index 88db385..7a11f9d 100644
--- a/src/Twilio.AspNet.Common/SmsRequest.cs
+++ b/src/Twilio.AspNet.Common/SmsRequest.cs
@@ -9,23 +9,23 @@ public class SmsRequest : TwilioRequest
     /// <summary>
     /// A 34 character unique identifier for the message. May be used to later retrieve this message from the REST API.
     /// </summary>
-    public string MessageSid { get; set; } = null!;
+    public string? MessageSid { get; set; } = null;
 
     /// <summary>
     /// Same value as MessageSid. Deprecated and included for backward compatibility.
     /// </summary>
     [Obsolete("Use MessageSid instead")]
-    public string SmsSid { get; set; }= null!;
+    public string? SmsSid { get; set; } = null;
 
     /// <summary>
     /// The text body of the SMS message. Up to 160 characters long
     /// </summary>
-    public string Body { get; set; }= null!;
-        
+    public string? Body { get; set; } = null;
+
     /// <summary>
     /// The status of the message
     /// </summary>
-    public string MessageStatus { get; set; }= null!;
+    public string? MessageStatus { get; set; } = null;
 
     /// <summary>
     /// The message OptOut type 
@@ -36,7 +36,7 @@ public class SmsRequest : TwilioRequest
     /// A unique identifier of the messaging service
     /// </summary>
     public string? MessagingServiceSid { get; set; }
-        
+
     /// <summary>
     /// The number of media items associated with your message
     /// </summary>
@@ -51,5 +51,5 @@ public class SmsRequest : TwilioRequest
     /// The number of media files associated with the Message resource
     /// </summary>
     public int NumSegments { get; set; }
-    
+
 }