diff --git a/CHANGELOG.md b/CHANGELOG.md
index df2ff7b1..aa4a593d 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,4 +1,9 @@
 # Change Log
+
+## [4.58.4](https://github.com/plivo/plivo-python/tree/v4.58.4) (2025-01-27)
+- Role param validation enhancement in Multiparty Add Participant API and XML creation
+- Added new param `cx_bot` in Start Stream API
+
 ## [4.58.3](https://github.com/plivo/plivo-python/tree/v4.58.3) (2025-01-14)
 - Added `from_number` and `to_number` filter support for `list messages` API
 - 
diff --git a/plivo/resources/calls.py b/plivo/resources/calls.py
index 8e01dce4..9e28f2ae 100644
--- a/plivo/resources/calls.py
+++ b/plivo/resources/calls.py
@@ -510,7 +510,8 @@ def start_stream(self,
                      status_callback_url=None,
                      status_callback_method=None,
                      content_type=None,
-                     extra_headers=None):
+                     extra_headers=None,
+                     cx_bot=None):
         return self.client.request('POST', ('Call', call_uuid, 'Stream'),
                                    to_param_dict(self.start_stream,
                                                  locals()), is_voice_request=True)
diff --git a/plivo/resources/multipartycall.py b/plivo/resources/multipartycall.py
index dbfc99ca..c6c4cc9b 100644
--- a/plivo/resources/multipartycall.py
+++ b/plivo/resources/multipartycall.py
@@ -268,7 +268,7 @@ def get(self, uuid=None, friendly_name=None, callback_url=None, callback_method=
                                        is_voice_request=True, response_type=MultiPartyCall)
 
     @validate_args(
-        role=[of_type_exact(str), is_in(('agent', 'supervisor', 'customer'), case_sensitive=False, case_type='lower')],
+        role=[of_type_exact(str), is_in(('ai-agent', 'agent', 'supervisor', 'customer'), case_sensitive=False, case_type='lower')],
         friendly_name=[optional(of_type_exact(str))],
         uuid=[optional(of_type_exact(str))],
         from_=[optional(is_phonenumber())],
diff --git a/plivo/version.py b/plivo/version.py
index 8a490f17..6cf34af2 100644
--- a/plivo/version.py
+++ b/plivo/version.py
@@ -1,2 +1,2 @@
 # -*- coding: utf-8 -*-
-__version__ = '4.58.3'
+__version__ = '4.58.4'
diff --git a/plivo/xml/MultiPartyCallElement.py b/plivo/xml/MultiPartyCallElement.py
index 8a01276f..a6d4ba33 100644
--- a/plivo/xml/MultiPartyCallElement.py
+++ b/plivo/xml/MultiPartyCallElement.py
@@ -367,7 +367,7 @@ def role(self):
     @validate_args(
         role=[
             of_type_exact(str),
-            is_in(('agent', 'supervisor', 'customer'), case_sensitive=False, case_type='lower')
+            is_in(('ai-agent', 'agent', 'supervisor', 'customer'), case_sensitive=False, case_type='lower')
         ]
     )
     def role(self, role):
diff --git a/setup.py b/setup.py
index 3aa08184..4242bcc5 100644
--- a/setup.py
+++ b/setup.py
@@ -10,7 +10,7 @@
 
 setup(
     name='plivo',
-    version='4.58.3',
+    version='4.58.4',
     description='A Python SDK to make voice calls & send SMS using Plivo and to generate Plivo XML',
     long_description=long_description,
     url='https://github.com/plivo/plivo-python',
diff --git a/tests/resources/test_multipartycalls.py b/tests/resources/test_multipartycalls.py
index 465c0958..5f0d8063 100644
--- a/tests/resources/test_multipartycalls.py
+++ b/tests/resources/test_multipartycalls.py
@@ -65,7 +65,7 @@ def test_add_participant_validations(self):
             self.client.multi_party_calls.add_participant(role='manager')
         except ValidationError as e:
             error_message = str(e)
-        self.assertEqual(error_message, "[\"role should be in ('agent', 'supervisor', "
+        self.assertEqual(error_message, "[\"role should be in ('ai-agent', 'agent', 'supervisor', "
                                         "'customer') (actual value: manager)\"]")
 
         try: