diff --git a/lib/customerio/requests/send_email_request.rb b/lib/customerio/requests/send_email_request.rb
index 3581bf0..46fe4d9 100644
--- a/lib/customerio/requests/send_email_request.rb
+++ b/lib/customerio/requests/send_email_request.rb
@@ -13,6 +13,7 @@ class SendEmailRequest
       preheader
       from
       reply_to
+      cc
       bcc
       subject
       body