diff --git a/slack_sdk/web/async_chat_stream.py b/slack_sdk/web/async_chat_stream.py
index 20e3fd98b..f5848b31e 100644
--- a/slack_sdk/web/async_chat_stream.py
+++ b/slack_sdk/web/async_chat_stream.py
@@ -158,6 +158,7 @@ async def stop(
         chunks: Optional[Sequence[Union[Dict, Chunk]]] = None,
         blocks: Optional[Union[str, Sequence[Union[Dict, Block]]]] = None,
         metadata: Optional[Union[Dict, Metadata]] = None,
+        session_status: Optional[str] = None,
         **kwargs,
     ) -> AsyncSlackResponse:
         """Stop the stream and finalize the message.
@@ -169,6 +170,7 @@ async def stop(
               what will be appended to the message received so far.
             metadata: JSON object with event_type and event_payload fields, presented as a URL-encoded string. Metadata you
               post to Slack is accessible to any app or user who is a member of that workspace.
+            session_status: The session status to set after stopping the stream.
             **kwargs: Additional arguments passed to the underlying API calls.
 
         Returns:
@@ -217,6 +219,7 @@ async def stop(
             blocks=blocks,
             chunks=flushings,
             metadata=metadata,
+            session_status=session_status,
             **kwargs,
         )
         self._state = "completed"
diff --git a/slack_sdk/web/async_client.py b/slack_sdk/web/async_client.py
index 13c8e3f2e..34f4ef934 100644
--- a/slack_sdk/web/async_client.py
+++ b/slack_sdk/web/async_client.py
@@ -3029,6 +3029,7 @@ async def chat_stopStream(
         blocks: Optional[Union[str, Sequence[Union[Dict, Block]]]] = None,
         metadata: Optional[Union[Dict, Metadata]] = None,
         chunks: Optional[Sequence[Union[Dict, Chunk]]] = None,
+        session_status: Optional[str] = None,
         **kwargs,
     ) -> AsyncSlackResponse:
         """Stops a streaming conversation.
@@ -3042,6 +3043,7 @@ async def chat_stopStream(
                 "blocks": blocks,
                 "metadata": metadata,
                 "chunks": chunks,
+                "session_status": session_status,
             }
         )
         _parse_web_class_objects(kwargs)
diff --git a/slack_sdk/web/chat_stream.py b/slack_sdk/web/chat_stream.py
index 9f97ac7cc..4adbc848a 100644
--- a/slack_sdk/web/chat_stream.py
+++ b/slack_sdk/web/chat_stream.py
@@ -148,6 +148,7 @@ def stop(
         chunks: Optional[Sequence[Union[Dict, Chunk]]] = None,
         blocks: Optional[Union[str, Sequence[Union[Dict, Block]]]] = None,
         metadata: Optional[Union[Dict, Metadata]] = None,
+        session_status: Optional[str] = None,
         **kwargs,
     ) -> SlackResponse:
         """Stop the stream and finalize the message.
@@ -159,6 +160,7 @@ def stop(
               what will be appended to the message received so far.
             metadata: JSON object with event_type and event_payload fields, presented as a URL-encoded string. Metadata you
               post to Slack is accessible to any app or user who is a member of that workspace.
+            session_status: The session status to set after stopping the stream.
             **kwargs: Additional arguments passed to the underlying API calls.
 
         Returns:
@@ -207,6 +209,7 @@ def stop(
             blocks=blocks,
             chunks=flushings,
             metadata=metadata,
+            session_status=session_status,
             **kwargs,
         )
         self._state = "completed"
diff --git a/slack_sdk/web/client.py b/slack_sdk/web/client.py
index a7a996969..8adf2e589 100644
--- a/slack_sdk/web/client.py
+++ b/slack_sdk/web/client.py
@@ -3019,6 +3019,7 @@ def chat_stopStream(
         blocks: Optional[Union[str, Sequence[Union[Dict, Block]]]] = None,
         metadata: Optional[Union[Dict, Metadata]] = None,
         chunks: Optional[Sequence[Union[Dict, Chunk]]] = None,
+        session_status: Optional[str] = None,
         **kwargs,
     ) -> SlackResponse:
         """Stops a streaming conversation.
@@ -3032,6 +3033,7 @@ def chat_stopStream(
                 "blocks": blocks,
                 "metadata": metadata,
                 "chunks": chunks,
+                "session_status": session_status,
             }
         )
         _parse_web_class_objects(kwargs)
diff --git a/slack_sdk/web/legacy_client.py b/slack_sdk/web/legacy_client.py
index 9ea477b7e..c538e67af 100644
--- a/slack_sdk/web/legacy_client.py
+++ b/slack_sdk/web/legacy_client.py
@@ -3029,6 +3029,7 @@ def chat_stopStream(
         blocks: Optional[Union[str, Sequence[Union[Dict, Block]]]] = None,
         metadata: Optional[Union[Dict, Metadata]] = None,
         chunks: Optional[Sequence[Union[Dict, Chunk]]] = None,
+        session_status: Optional[str] = None,
         **kwargs,
     ) -> Union[Future, SlackResponse]:
         """Stops a streaming conversation.
@@ -3042,6 +3043,7 @@ def chat_stopStream(
                 "blocks": blocks,
                 "metadata": metadata,
                 "chunks": chunks,
+                "session_status": session_status,
             }
         )
         _parse_web_class_objects(kwargs)
diff --git a/tests/slack_sdk/web/test_chat_stream.py b/tests/slack_sdk/web/test_chat_stream.py
index 841de9c38..8be6364a3 100644
--- a/tests/slack_sdk/web/test_chat_stream.py
+++ b/tests/slack_sdk/web/test_chat_stream.py
@@ -139,6 +139,7 @@ def test_streams_a_long_message(self):
                 )
             ],
             markdown_text="*",
+            session_status="processing",
             token="xoxb-chat_stream_test_token2",
         )
 
@@ -176,6 +177,7 @@ def test_streams_a_long_message(self):
                 json.dumps(stop_request.get("chunks")),
                 '[{"text": "**", "type": "markdown_text"}]',
             )
+            self.assertEqual(stop_request.get("session_status"), "processing")
             self.assertEqual(stop_request.get("token"), "xoxb-chat_stream_test_token2")
             self.assertEqual(stop_request.get("ts"), "123.123")
 
diff --git a/tests/slack_sdk_async/web/test_async_chat_stream.py b/tests/slack_sdk_async/web/test_async_chat_stream.py
index 5d5ccf344..522fffd06 100644
--- a/tests/slack_sdk_async/web/test_async_chat_stream.py
+++ b/tests/slack_sdk_async/web/test_async_chat_stream.py
@@ -142,6 +142,7 @@ async def test_streams_a_long_message(self):
                 )
             ],
             markdown_text="*",
+            session_status="processing",
             token="xoxb-chat_stream_test_token2",
         )
 
@@ -179,6 +180,7 @@ async def test_streams_a_long_message(self):
                 json.dumps(stop_request.get("chunks")),
                 '[{"text": "**", "type": "markdown_text"}]',
             )
+            self.assertEqual(stop_request.get("session_status"), "processing")
             self.assertEqual(stop_request.get("token"), "xoxb-chat_stream_test_token2")
             self.assertEqual(stop_request.get("ts"), "123.123")