diff --git a/examples/domains.py b/examples/domains.py
index 9ed0d3a..119d6fb 100644
--- a/examples/domains.py
+++ b/examples/domains.py
@@ -15,8 +15,6 @@
 print(domain)
 
 retrieved: resend.Domain = resend.Domains.get(domain_id=domain["id"])
-print(retrieved)
-
 if retrieved["records"] is not None:
     for record in retrieved["records"]:
         print(record)
@@ -25,6 +23,7 @@
     "id": domain["id"],
     "open_tracking": True,
     "click_tracking": True,
+    "tls": "enforced",
 }
 
 updated_domain: resend.Domain = resend.Domains.update(update_params)
diff --git a/resend/domains/_domains.py b/resend/domains/_domains.py
index 689899a..83425f5 100644
--- a/resend/domains/_domains.py
+++ b/resend/domains/_domains.py
@@ -1,10 +1,12 @@
 from typing import Any, Dict, List, cast
 
-from typing_extensions import NotRequired, TypedDict
+from typing_extensions import Literal, NotRequired, TypedDict
 
 from resend import request
 from resend.domains._domain import Domain
 
+TlsOptions = Literal["enforced", "opportunistic"]
+
 
 class _ListResponse(TypedDict):
     data: List[Domain]
@@ -36,6 +38,17 @@ class UpdateParams(TypedDict):
         """
         Track the open rate of each email.
         """
+        tls: NotRequired[TlsOptions]
+        """
+        default: "opportunistic"
+        opportunistic: Opportunistic TLS means that it always attempts to make a
+        secure connection to the receiving mail server.
+        If it can't establish a secure connection, it sends the message unencrypted.
+
+        enforced: Enforced TLS on the other hand, requires that the email
+        communication must use TLS no matter what.
+        If the receiving server does not support TLS, the email will not be sent.
+        """
 
     class CreateParams(TypedDict):
         name: str
diff --git a/resend/version.py b/resend/version.py
index 3763972..61eca4f 100644
--- a/resend/version.py
+++ b/resend/version.py
@@ -1,4 +1,4 @@
-__version__ = "2.0.0"
+__version__ = "2.1.0"
 
 
 def get_version() -> str:
diff --git a/tests/domains_test.py b/tests/domains_test.py
index 814b887..3204b2d 100644
--- a/tests/domains_test.py
+++ b/tests/domains_test.py
@@ -184,6 +184,7 @@ def test_domains_update(self) -> None:
             "id": "479e3145-dd38-476b-932c-529ceb705947",
             "open_tracking": True,
             "click_tracking": True,
+            "tls": "opportunistic",
         }
         domain = resend.Domains.update(params)
         assert domain["id"] == "479e3145-dd38-476b-932c-529ceb705947"