diff --git a/jarvis_core/log.py b/jarvis_core/log.py
index 1c81c5c..e930c63 100644
--- a/jarvis_core/log.py
+++ b/jarvis_core/log.py
@@ -15,7 +15,7 @@ def get_logger(
     """
     logger = logging.getLogger(name)
     handler = RichHandler(
-        rich_tracebacks=True, tracebacks_show_locals=show_locals, log_time_format="[{format}]"
+        rich_tracebacks=True, tracebacks_show_locals=show_locals, log_time_format=f"[{format}]"
     )
     logger.addHandler(handler)
     return logger