diff --git a/examples/contacts.py b/examples/contacts.py
index 4239d0e..32e1384 100644
--- a/examples/contacts.py
+++ b/examples/contacts.py
@@ -7,7 +7,8 @@
     raise EnvironmentError("RESEND_API_KEY is missing")
 
 # replace with some audience id
-audience_id: str = "ca4e37c5-a82a-4199-a3b8-bf912a6472aa"
+audience_id: str = "78b8d3bc-a55a-45a3-aee6-6ec0a5e13d7e"
+contact_id = "b5c95127-937b-4872-a765-06636e5f73da"
 
 create_params: resend.Contacts.CreateParams = {
     "audience_id": audience_id,
@@ -23,9 +24,9 @@
 
 update_params: resend.Contacts.UpdateParams = {
     "audience_id": audience_id,
-    "id": contact["id"],
+    "id": contact_id,
     "unsubscribed": False,
-    "first_name": "Steve1",
+    "first_name": "Steve",
 }
 
 updated: resend.Contact = resend.Contacts.update(update_params)
diff --git a/resend/contacts/_contacts.py b/resend/contacts/_contacts.py
index 7f89216..381bfa2 100644
--- a/resend/contacts/_contacts.py
+++ b/resend/contacts/_contacts.py
@@ -51,7 +51,7 @@ class UpdateParams(TypedDict):
         """
         The audience id.
         """
-        id: str
+        id: NotRequired[str]
         """
         The contact id.
         """
@@ -102,7 +102,12 @@ def update(cls, params: UpdateParams) -> Contact:
         Returns:
             Contact: The updated contact object
         """
-        path = f"/audiences/{params['audience_id']}/contacts/{params['id']}"
+        if params.get("id") is None and params.get("email") is None:
+            raise ValueError("id or email must be provided")
+
+        val = params.get("id") if params.get("id") is not None else params.get("email")
+
+        path = f"/audiences/{params['audience_id']}/contacts/{val}"
         resp = request.Request[Contact](
             path=path, params=cast(Dict[Any, Any], params), verb="patch"
         ).perform_with_content()
diff --git a/tests/contacts_test.py b/tests/contacts_test.py
index 2100023..b3738e7 100644
--- a/tests/contacts_test.py
+++ b/tests/contacts_test.py
@@ -50,6 +50,19 @@ def test_contacts_update(self) -> None:
         contact = resend.Contacts.update(params)
         assert contact["id"] == "479e3145-dd38-476b-932c-529ceb705947"
 
+    def test_contacts_update_missing_required_params(self) -> None:
+
+        params: resend.Contacts.UpdateParams = {
+            "audience_id": "48c269ed-9873-4d60-bdd9-cd7e6fc0b9b8",
+            "first_name": "Updated",
+            "unsubscribed": True,
+        }
+
+        try:
+            resend.Contacts.update(params)
+        except ValueError as e:
+            assert str(e) == "id or email must be provided"
+
     def test_should_update_contacts_raise_exception_when_no_content(self) -> None:
         self.set_mock_json(None)
         params: resend.Contacts.UpdateParams = {