diff --git a/src/elevenlabs/conversational_ai/conversation.py b/src/elevenlabs/conversational_ai/conversation.py
index 03cb9ed4..8a7cea48 100644
--- a/src/elevenlabs/conversational_ai/conversation.py
+++ b/src/elevenlabs/conversational_ai/conversation.py
@@ -391,6 +391,7 @@ def __init__(
         config: Optional[ConversationInitiationData] = None,
         client_tools: Optional[ClientTools] = None,
         on_prem_config: Optional[OnPremInitiationData] = None,
+        environment: Optional[str] = None,
     ):
         self.client = client
         self.agent_id = agent_id
@@ -399,6 +400,7 @@ def __init__(
         self.config = config or ConversationInitiationData()
         self.client_tools = client_tools or ClientTools()
         self.on_prem_config = on_prem_config
+        self.environment = environment
 
         self.client_tools.start()
 
@@ -418,10 +420,16 @@ def _get_wss_url(self):
         # Ensure base URL ends with '/' for proper joining
         if not base_ws_url.endswith("/"):
             base_ws_url += "/"
-        return f"{base_ws_url}v1/convai/conversation?agent_id={self.agent_id}&source=python_sdk&version={__version__}"
+        url = f"{base_ws_url}v1/convai/conversation?agent_id={self.agent_id}&source=python_sdk&version={__version__}"
+        if self.environment:
+            url += f"&environment={self.environment}"
+        return url
 
     def _get_signed_url(self):
-        response = self.client.conversational_ai.conversations.get_signed_url(agent_id=self.agent_id)
+        response = self.client.conversational_ai.conversations.get_signed_url(
+            agent_id=self.agent_id,
+            environment=self.environment,
+        )
         signed_url = response.signed_url
         # Append source and version query parameters to the signed URL
         separator = "&" if "?" in signed_url else "?"
@@ -633,6 +641,7 @@ def __init__(
         callback_audio_alignment: Optional[Callable[[AudioEventAlignment], None]] = None,
         callback_end_session: Optional[Callable] = None,
         on_prem_config: Optional[OnPremInitiationData] = None,
+        environment: Optional[str] = None,
     ):
         """Conversational AI session.
 
@@ -654,6 +663,7 @@ def __init__(
             callback_user_transcript: Callback for user transcripts.
             callback_latency_measurement: Callback for latency measurements (in milliseconds).
             callback_audio_alignment: Callback for audio alignment data with character-level timing.
+            environment: The environment to use. Defaults to "production" on the server.
         """
 
         super().__init__(
@@ -664,6 +674,7 @@ def __init__(
             config=config,
             client_tools=client_tools,
             on_prem_config=on_prem_config,
+            environment=environment,
         )
 
         self.audio_interface = audio_interface
@@ -925,6 +936,7 @@ def __init__(
         callback_audio_alignment: Optional[Callable[[AudioEventAlignment], Awaitable[None]]] = None,
         callback_end_session: Optional[Callable[[], Awaitable[None]]] = None,
         on_prem_config: Optional[OnPremInitiationData] = None,
+        environment: Optional[str] = None,
     ):
         """Async Conversational AI session.
 
@@ -947,6 +959,7 @@ def __init__(
             callback_latency_measurement: Async callback for latency measurements (in milliseconds).
             callback_audio_alignment: Async callback for audio alignment data with character-level timing.
             callback_end_session: Async callback for when session ends.
+            environment: The environment to use. Defaults to "production" on the server.
         """
 
         super().__init__(
@@ -957,6 +970,7 @@ def __init__(
             config=config,
             client_tools=client_tools,
             on_prem_config=on_prem_config,
+            environment=environment,
         )
 
         self.audio_interface = audio_interface
diff --git a/src/elevenlabs/conversational_ai/conversations/client.py b/src/elevenlabs/conversational_ai/conversations/client.py
index d44d0691..6dc0c41a 100644
--- a/src/elevenlabs/conversational_ai/conversations/client.py
+++ b/src/elevenlabs/conversational_ai/conversations/client.py
@@ -48,6 +48,7 @@ def get_signed_url(
         agent_id: str,
         include_conversation_id: typing.Optional[bool] = None,
         branch_id: typing.Optional[str] = None,
+        environment: typing.Optional[str] = None,
         request_options: typing.Optional[RequestOptions] = None,
     ) -> ConversationSignedUrlResponseModel:
         """
@@ -64,6 +65,9 @@ def get_signed_url(
         branch_id : typing.Optional[str]
             The ID of the branch to use
 
+        environment : typing.Optional[str]
+            The environment to use. Defaults to "production" on the server.
+
         request_options : typing.Optional[RequestOptions]
             Request-specific configuration.
 
@@ -89,6 +93,7 @@ def get_signed_url(
             agent_id=agent_id,
             include_conversation_id=include_conversation_id,
             branch_id=branch_id,
+            environment=environment,
             request_options=request_options,
         )
         return _response.data
@@ -99,6 +104,7 @@ def get_webrtc_token(
         agent_id: str,
         participant_name: typing.Optional[str] = None,
         branch_id: typing.Optional[str] = None,
+        environment: typing.Optional[str] = None,
         request_options: typing.Optional[RequestOptions] = None,
     ) -> TokenResponseModel:
         """
@@ -115,6 +121,9 @@ def get_webrtc_token(
         branch_id : typing.Optional[str]
             The ID of the branch to use
 
+        environment : typing.Optional[str]
+            The environment to use. Defaults to "production" on the server.
+
         request_options : typing.Optional[RequestOptions]
             Request-specific configuration.
 
@@ -137,7 +146,7 @@ def get_webrtc_token(
         )
         """
         _response = self._raw_client.get_webrtc_token(
-            agent_id=agent_id, participant_name=participant_name, branch_id=branch_id, request_options=request_options
+            agent_id=agent_id, participant_name=participant_name, branch_id=branch_id, environment=environment, request_options=request_options
         )
         return _response.data
 
@@ -412,6 +421,7 @@ async def get_signed_url(
         agent_id: str,
         include_conversation_id: typing.Optional[bool] = None,
         branch_id: typing.Optional[str] = None,
+        environment: typing.Optional[str] = None,
         request_options: typing.Optional[RequestOptions] = None,
     ) -> ConversationSignedUrlResponseModel:
         """
@@ -428,6 +438,9 @@ async def get_signed_url(
         branch_id : typing.Optional[str]
             The ID of the branch to use
 
+        environment : typing.Optional[str]
+            The environment to use. Defaults to "production" on the server.
+
         request_options : typing.Optional[RequestOptions]
             Request-specific configuration.
 
@@ -461,6 +474,7 @@ async def main() -> None:
             agent_id=agent_id,
             include_conversation_id=include_conversation_id,
             branch_id=branch_id,
+            environment=environment,
             request_options=request_options,
         )
         return _response.data
@@ -471,6 +485,7 @@ async def get_webrtc_token(
         agent_id: str,
         participant_name: typing.Optional[str] = None,
         branch_id: typing.Optional[str] = None,
+        environment: typing.Optional[str] = None,
         request_options: typing.Optional[RequestOptions] = None,
     ) -> TokenResponseModel:
         """
@@ -487,6 +502,9 @@ async def get_webrtc_token(
         branch_id : typing.Optional[str]
             The ID of the branch to use
 
+        environment : typing.Optional[str]
+            The environment to use. Defaults to "production" on the server.
+
         request_options : typing.Optional[RequestOptions]
             Request-specific configuration.
 
@@ -517,7 +535,7 @@ async def main() -> None:
         asyncio.run(main())
         """
         _response = await self._raw_client.get_webrtc_token(
-            agent_id=agent_id, participant_name=participant_name, branch_id=branch_id, request_options=request_options
+            agent_id=agent_id, participant_name=participant_name, branch_id=branch_id, environment=environment, request_options=request_options
         )
         return _response.data
 
diff --git a/src/elevenlabs/conversational_ai/conversations/raw_client.py b/src/elevenlabs/conversational_ai/conversations/raw_client.py
index b5c79500..b9a1be87 100644
--- a/src/elevenlabs/conversational_ai/conversations/raw_client.py
+++ b/src/elevenlabs/conversational_ai/conversations/raw_client.py
@@ -30,6 +30,7 @@ def get_signed_url(
         agent_id: str,
         include_conversation_id: typing.Optional[bool] = None,
         branch_id: typing.Optional[str] = None,
+        environment: typing.Optional[str] = None,
         request_options: typing.Optional[RequestOptions] = None,
     ) -> HttpResponse[ConversationSignedUrlResponseModel]:
         """
@@ -46,6 +47,9 @@ def get_signed_url(
         branch_id : typing.Optional[str]
             The ID of the branch to use
 
+        environment : typing.Optional[str]
+            The environment to use. Defaults to "production" on the server.
+
         request_options : typing.Optional[RequestOptions]
             Request-specific configuration.
 
@@ -61,6 +65,7 @@ def get_signed_url(
                 "agent_id": agent_id,
                 "include_conversation_id": include_conversation_id,
                 "branch_id": branch_id,
+                "environment": environment,
             },
             request_options=request_options,
         )
@@ -96,6 +101,7 @@ def get_webrtc_token(
         agent_id: str,
         participant_name: typing.Optional[str] = None,
         branch_id: typing.Optional[str] = None,
+        environment: typing.Optional[str] = None,
         request_options: typing.Optional[RequestOptions] = None,
     ) -> HttpResponse[TokenResponseModel]:
         """
@@ -112,6 +118,9 @@ def get_webrtc_token(
         branch_id : typing.Optional[str]
             The ID of the branch to use
 
+        environment : typing.Optional[str]
+            The environment to use. Defaults to "production" on the server.
+
         request_options : typing.Optional[RequestOptions]
             Request-specific configuration.
 
@@ -127,6 +136,7 @@ def get_webrtc_token(
                 "agent_id": agent_id,
                 "participant_name": participant_name,
                 "branch_id": branch_id,
+                "environment": environment,
             },
             request_options=request_options,
         )
@@ -419,6 +429,7 @@ async def get_signed_url(
         agent_id: str,
         include_conversation_id: typing.Optional[bool] = None,
         branch_id: typing.Optional[str] = None,
+        environment: typing.Optional[str] = None,
         request_options: typing.Optional[RequestOptions] = None,
     ) -> AsyncHttpResponse[ConversationSignedUrlResponseModel]:
         """
@@ -435,6 +446,9 @@ async def get_signed_url(
         branch_id : typing.Optional[str]
             The ID of the branch to use
 
+        environment : typing.Optional[str]
+            The environment to use. Defaults to "production" on the server.
+
         request_options : typing.Optional[RequestOptions]
             Request-specific configuration.
 
@@ -450,6 +464,7 @@ async def get_signed_url(
                 "agent_id": agent_id,
                 "include_conversation_id": include_conversation_id,
                 "branch_id": branch_id,
+                "environment": environment,
             },
             request_options=request_options,
         )
@@ -485,6 +500,7 @@ async def get_webrtc_token(
         agent_id: str,
         participant_name: typing.Optional[str] = None,
         branch_id: typing.Optional[str] = None,
+        environment: typing.Optional[str] = None,
         request_options: typing.Optional[RequestOptions] = None,
     ) -> AsyncHttpResponse[TokenResponseModel]:
         """
@@ -501,6 +517,9 @@ async def get_webrtc_token(
         branch_id : typing.Optional[str]
             The ID of the branch to use
 
+        environment : typing.Optional[str]
+            The environment to use. Defaults to "production" on the server.
+
         request_options : typing.Optional[RequestOptions]
             Request-specific configuration.
 
@@ -516,6 +535,7 @@ async def get_webrtc_token(
                 "agent_id": agent_id,
                 "participant_name": participant_name,
                 "branch_id": branch_id,
+                "environment": environment,
             },
             request_options=request_options,
         )
diff --git a/tests/test_async_convai.py b/tests/test_async_convai.py
index b6a4d702..364b90eb 100644
--- a/tests/test_async_convai.py
+++ b/tests/test_async_convai.py
@@ -141,7 +141,7 @@ async def test_async_conversation_with_auth():
         await conversation.wait_for_session_end()
 
     # Assertions
-    mock_client.conversational_ai.conversations.get_signed_url.assert_called_once_with(agent_id=TEST_AGENT_ID)
+    mock_client.conversational_ai.conversations.get_signed_url.assert_called_once_with(agent_id=TEST_AGENT_ID, environment=None)
 
 
 @pytest.mark.asyncio
diff --git a/tests/test_convai.py b/tests/test_convai.py
index 248b475a..69a30719 100644
--- a/tests/test_convai.py
+++ b/tests/test_convai.py
@@ -129,7 +129,7 @@ def test_conversation_with_auth():
         conversation.wait_for_session_end()
 
     # Assertions
-    mock_client.conversational_ai.conversations.get_signed_url.assert_called_once_with(agent_id=TEST_AGENT_ID)
+    mock_client.conversational_ai.conversations.get_signed_url.assert_called_once_with(agent_id=TEST_AGENT_ID, environment=None)
 
 
 def test_conversation_with_dynamic_variables():
diff --git a/tests/utils.py b/tests/utils.py
index f2061ef0..3b0d48d3 100644
--- a/tests/utils.py
+++ b/tests/utils.py
@@ -6,7 +6,7 @@
 
 IN_GITHUB = "GITHUB_ACTIONS" in os.environ
 
-DEFAULT_VOICE = "21m00Tcm4TlvDq8ikWAM"
+DEFAULT_VOICE = "IRHApOXLvnW57QJPQH2P"
 DEFAULT_TEXT = "Hello"
 DEFAULT_MODEL = "eleven_multilingual_v2"
 DEFAULT_VOICE_FILE = "tests/fixtures/voice_sample.mp3"