diff --git a/python/packages/autogen-ext/src/autogen_ext/experimental/task_centric_memory/utils/chat_completion_client_recorder.py b/python/packages/autogen-ext/src/autogen_ext/experimental/task_centric_memory/utils/chat_completion_client_recorder.py
index 8b981312f427..66c304a6ae05 100644
--- a/python/packages/autogen-ext/src/autogen_ext/experimental/task_centric_memory/utils/chat_completion_client_recorder.py
+++ b/python/packages/autogen-ext/src/autogen_ext/experimental/task_centric_memory/utils/chat_completion_client_recorder.py
@@ -73,7 +73,7 @@ def __init__(
             # Load the previously recorded messages and responses from disk.
             self.logger.info("Replay mode enabled.\nRetrieving session from: " + self.session_file_path)
             try:
-                with open(self.session_file_path, "r") as f:
+                with open(self.session_file_path, "r", encoding="utf-8") as f:
                     self.records = json.load(f)
             except Exception as e:
                 error_str = f"\nFailed to load recorded session: '{self.session_file_path}': {e}"
@@ -211,7 +211,7 @@ def finalize(self) -> None:
                 # Create the directory if it doesn't exist.
                 os.makedirs(os.path.dirname(self.session_file_path), exist_ok=True)
                 # Write the records to disk.
-                with open(self.session_file_path, "w") as f:
+                with open(self.session_file_path, "w", encoding="utf-8") as f:
                     json.dump(self.records, f, indent=2)
                     self.logger.info("\nRecorded session was saved to: " + self.session_file_path)
             except Exception as e:
diff --git a/python/packages/autogen-ext/src/autogen_ext/experimental/task_centric_memory/utils/page_logger.py b/python/packages/autogen-ext/src/autogen_ext/experimental/task_centric_memory/utils/page_logger.py
index fa7fe2f1d567..2ccec94d42cc 100644
--- a/python/packages/autogen-ext/src/autogen_ext/experimental/task_centric_memory/utils/page_logger.py
+++ b/python/packages/autogen-ext/src/autogen_ext/experimental/task_centric_memory/utils/page_logger.py
@@ -117,7 +117,7 @@ def finalize(self) -> None:
         # Write the hash and other details to a file.
         hash_str, num_files, num_subdirs = hash_directory(self.log_dir)
         hash_path = os.path.join(self.log_dir, "hash.txt")
-        with open(hash_path, "w") as f:
+        with open(hash_path, "w", encoding="utf-8") as f:
             f.write(hash_str)
             f.write("\n")
             f.write("{} files\n".format(num_files))
@@ -386,7 +386,7 @@ def flush(self, finished: bool = False) -> None:
             return
         # Create a call tree of the log.
         call_tree_path = os.path.join(self.log_dir, self.name + ".html")
-        with open(call_tree_path, "w") as f:
+        with open(call_tree_path, "w", encoding="utf-8") as f:
             f.write(_html_opening("0 Call Tree", finished=finished))
             f.write(f"<h3>{self.name}</h3>")
             f.write("\n")
@@ -498,7 +498,7 @@ def flush(self) -> None:
         Writes the HTML page to disk.
         """
         page_path = os.path.join(self.page_logger.log_dir, self.index_str + ".html")
-        with open(page_path, "w") as f:
+        with open(page_path, "w", encoding="utf-8") as f:
             f.write(_html_opening(self.file_title, finished=self.finished))
             f.write(f"<h3>{self.file_title}</h3>\n")
             for line in self.lines: