diff --git a/python/packages/autogen-ext/src/autogen_ext/code_executors/docker_jupyter/_docker_jupyter.py b/python/packages/autogen-ext/src/autogen_ext/code_executors/docker_jupyter/_docker_jupyter.py
index a7dbccc43381..4ac5c3f19518 100644
--- a/python/packages/autogen-ext/src/autogen_ext/code_executors/docker_jupyter/_docker_jupyter.py
+++ b/python/packages/autogen-ext/src/autogen_ext/code_executors/docker_jupyter/_docker_jupyter.py
@@ -275,7 +275,7 @@ def _save_html(self, html_data: str) -> str:
         """Save html data to a file."""
         filename = f"{uuid.uuid4().hex}.html"
         path = os.path.join(str(self._output_dir), filename)
-        with open(path, "w") as f:
+        with open(path, "w", encoding="utf-8") as f:
             f.write(html_data)
         return os.path.abspath(path)
 
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:
diff --git a/python/packages/autogen-studio/autogenstudio/cli.py b/python/packages/autogen-studio/autogenstudio/cli.py
index 373f13e087f2..aa92013c98df 100644
--- a/python/packages/autogen-studio/autogenstudio/cli.py
+++ b/python/packages/autogen-studio/autogenstudio/cli.py
@@ -69,7 +69,7 @@ def ui(
 
     # Create temporary env file to share configuration with uvicorn workers
     env_file_path = get_env_file_path()
-    with open(env_file_path, "w") as temp_env:
+    with open(env_file_path, "w", encoding="utf-8") as temp_env:
         for key, value in env_vars.items():
             temp_env.write(f"{key}={value}\n")
 
diff --git a/python/packages/autogen-studio/autogenstudio/database/schema_manager.py b/python/packages/autogen-studio/autogenstudio/database/schema_manager.py
index 0762b0890d30..6b942354c4ce 100644
--- a/python/packages/autogen-studio/autogenstudio/database/schema_manager.py
+++ b/python/packages/autogen-studio/autogenstudio/database/schema_manager.py
@@ -75,7 +75,7 @@ def _update_configuration(self) -> None:
 
         # Update alembic.ini
         config_content = self._generate_alembic_ini_content()
-        with open(self.alembic_ini_path, "w") as f:
+        with open(self.alembic_ini_path, "w", encoding="utf-8") as f:
             f.write(config_content)
 
         # Update env.py
@@ -115,7 +115,7 @@ def _initialize_alembic(self) -> bool:
 
             # Create initial config file for alembic init
             config_content = self._generate_alembic_ini_content()
-            with open(self.alembic_ini_path, "w") as f:
+            with open(self.alembic_ini_path, "w", encoding="utf-8") as f:
                 f.write(config_content)
 
             # Use the config we just created
@@ -187,7 +187,7 @@ def run_migrations_online() -> None:
 else:
     run_migrations_online()"""
 
-        with open(env_path, "w") as f:
+        with open(env_path, "w", encoding="utf-8") as f:
             f.write(content)
 
     def _generate_alembic_ini_content(self) -> str:
@@ -239,7 +239,7 @@ def update_script_template(self):
         """Update the Alembic script template to include SQLModel."""
         template_path = self.alembic_dir / "script.py.mako"
         try:
-            with open(template_path, "r") as f:
+            with open(template_path, "r", encoding="utf-8") as f:
                 content = f.read()
 
             # Add sqlmodel import to imports section
@@ -248,7 +248,7 @@ def update_script_template(self):
 
             content = content.replace(import_section, new_imports)
 
-            with open(template_path, "w") as f:
+            with open(template_path, "w", encoding="utf-8") as f:
                 f.write(content)
 
             return True
@@ -265,7 +265,7 @@ def _update_env_py(self, env_path: Path) -> None:
             self._create_minimal_env_py(env_path)
             return
         try:
-            with open(env_path, "r") as f:
+            with open(env_path, "r", encoding="utf-8") as f:
                 content = f.read()
 
             # Add SQLModel import if not present
@@ -303,7 +303,7 @@ def _update_env_py(self, env_path: Path) -> None:
             )""",
             )
 
-            with open(env_path, "w") as f:
+            with open(env_path, "w", encoding="utf-8") as f:
                 f.write(content)
         except Exception as e:
             logger.error(f"Failed to update env.py: {e}")
diff --git a/python/packages/autogen-studio/autogenstudio/gallery/builder.py b/python/packages/autogen-studio/autogenstudio/gallery/builder.py
index 55a124367dd4..b83456ec0ee6 100644
--- a/python/packages/autogen-studio/autogenstudio/gallery/builder.py
+++ b/python/packages/autogen-studio/autogenstudio/gallery/builder.py
@@ -630,5 +630,5 @@ def create_default_lite_team():
     gallery = create_default_gallery()
 
     # Save to file
-    with open("gallery_default.json", "w") as f:
+    with open("gallery_default.json", "w", encoding="utf-8") as f:
         f.write(gallery.model_dump_json(indent=2))
diff --git a/python/packages/autogen-studio/autogenstudio/lite/studio.py b/python/packages/autogen-studio/autogenstudio/lite/studio.py
index 94b25cd85b6e..6ff0b4011f82 100644
--- a/python/packages/autogen-studio/autogenstudio/lite/studio.py
+++ b/python/packages/autogen-studio/autogenstudio/lite/studio.py
@@ -151,7 +151,7 @@ def _setup_environment(self) -> str:
         }
 
         env_file_path = self._get_env_file_path()
-        with open(env_file_path, "w") as temp_env:
+        with open(env_file_path, "w", encoding="utf-8") as temp_env:
             for key, value in env_vars.items():
                 temp_env.write(f"{key}={value}\n")
 
diff --git a/python/packages/autogen-studio/autogenstudio/web/auth/manager.py b/python/packages/autogen-studio/autogenstudio/web/auth/manager.py
index ab16e0432d0a..de391e093261 100644
--- a/python/packages/autogen-studio/autogenstudio/web/auth/manager.py
+++ b/python/packages/autogen-studio/autogenstudio/web/auth/manager.py
@@ -117,7 +117,7 @@ def is_valid_token(self, token: str) -> bool:
     def from_yaml(cls, yaml_path: str) -> Self:
         """Create AuthManager from YAML config file."""
         try:
-            with open(yaml_path, "r") as f:
+            with open(yaml_path, "r", encoding="utf-8") as f:
                 config_data = yaml.safe_load(f)
             config = AuthConfig(**config_data)
             return cls(config)