diff --git a/src/project_x_py/client/base.py b/src/project_x_py/client/base.py
index 4010fc5..9970623 100644
--- a/src/project_x_py/client/base.py
+++ b/src/project_x_py/client/base.py
@@ -266,7 +266,7 @@ async def from_config_file(
             ...     "api_url": "https://api.topstepx.com/api",
             ...     "user_hub_url": "https://rtc.topstepx.com/hubs/user",
             ...     "market_hub_url": "https://rtc.topstepx.com/hubs/market",
-            ...     "timezone": "US/Central",
+            ...     "timezone": "America/Chicago",
             ... }
             >>> with open("config.json", "w") as f:
             ...     json.dump(config, f)
diff --git a/tests/client/test_base.py b/tests/client/test_base.py
index a3a9186..1dc12ef 100644
--- a/tests/client/test_base.py
+++ b/tests/client/test_base.py
@@ -249,7 +249,7 @@ async def test_from_config_file(self):
                 realtime_url="wss://file.realtime.com",
                 user_hub_url="/file-userhub",
                 market_hub_url="/file-markethub",
-                timezone="US/Pacific",
+                timezone="America/Los_Angeles",
                 timeout_seconds=45,
                 retry_attempts=4,
                 retry_delay_seconds=1.5,
@@ -286,7 +286,7 @@ async def test_from_config_file_with_account_name(self):
                 realtime_url="wss://file.realtime.com",
                 user_hub_url="/file-userhub",
                 market_hub_url="/file-markethub",
-                timezone="US/Pacific",
+                timezone="America/Los_Angeles",
                 timeout_seconds=45,
                 retry_attempts=4,
                 retry_delay_seconds=1.5,
diff --git a/tests/realtime_data_manager/test_data_access_edge_cases.py b/tests/realtime_data_manager/test_data_access_edge_cases.py
index 91cf7e0..40de3e8 100644
--- a/tests/realtime_data_manager/test_data_access_edge_cases.py
+++ b/tests/realtime_data_manager/test_data_access_edge_cases.py
@@ -347,7 +347,7 @@ async def test_get_bars_since_with_pytz_timezone_object(self):
         manager = MockDataAccessManager()
 
         # Use a pytz timezone that has localize method
-        est = pytz.timezone("US/Eastern")
+        est = pytz.timezone("America/New_York")
         manager.timezone = est
 
         base_time = est.localize(datetime(2023, 6, 15, 10, 30))
diff --git a/tests/realtime_data_manager/test_data_processing_edge_cases.py b/tests/realtime_data_manager/test_data_processing_edge_cases.py
index bf3f563..2f373ce 100644
--- a/tests/realtime_data_manager/test_data_processing_edge_cases.py
+++ b/tests/realtime_data_manager/test_data_processing_edge_cases.py
@@ -562,7 +562,7 @@ async def test_calculate_bar_time_timezone_scenarios(self):
         manager = MockDataProcessingManager()
 
         # Test with pytz timezone (has localize method)
-        manager.timezone = pytz.timezone("US/Eastern")
+        manager.timezone = pytz.timezone("America/New_York")
         naive_timestamp = datetime(2023, 6, 15, 10, 30, 45)
 
         bar_time = manager._calculate_bar_time(naive_timestamp, 5, 2)