diff --git a/CHANGELOG.md b/CHANGELOG.md
new file mode 100644
index 0000000..6b52c0f
--- /dev/null
+++ b/CHANGELOG.md
@@ -0,0 +1 @@
+# Stagehand Python Changelog
diff --git a/CHANGELOG.txt b/CHANGELOG.txt
deleted file mode 100644
index b5269eb..0000000
--- a/CHANGELOG.txt
+++ /dev/null
@@ -1,10 +0,0 @@
-# Stagehand Python SDK Changelog
-
-## 0.3.4 (2025-04-05)
-- Fixed AgentExecuteResult schema
-
-## 0.3.3 (2025-04-04)
-- Fixed logs
-
-## 0.3.0
-- Initial public release 
\ No newline at end of file
diff --git a/stagehand/api.py b/stagehand/api.py
index ff8601c..28eb216 100644
--- a/stagehand/api.py
+++ b/stagehand/api.py
@@ -1,4 +1,5 @@
 import json
+from datetime import datetime
 from typing import Any
 
 from .utils import convert_dict_keys_to_camel_case
@@ -67,6 +68,7 @@ async def _create_session(self):
         "x-bb-project-id": self.browserbase_project_id,
         "x-model-api-key": self.model_api_key,
         "Content-Type": "application/json",
+        "x-sent-at": datetime.now().isoformat(),
         "x-language": "python",
     }
 
@@ -96,6 +98,7 @@ async def _execute(self, method: str, payload: dict[str, Any]) -> Any:
         "x-bb-project-id": self.browserbase_project_id,
         "Content-Type": "application/json",
         "Connection": "keep-alive",
+        "x-sent-at": datetime.now().isoformat(),
         # Always enable streaming for better log handling
         "x-stream-response": "true",
     }