diff --git a/src/statistics/debug_logging.py b/src/statistics/debug_logging.py
index 91ebd2f..83660f3 100644
--- a/src/statistics/debug_logging.py
+++ b/src/statistics/debug_logging.py
@@ -3,7 +3,7 @@ import logging
 import json
 
 def _debug_log_change(countChange: int, directionState: dict) -> None:
-    json_state = json.dumps(directionState)
+    json_state = json.dumps(directionState, default=str)
     logging.debug(f"CHANGE;Count Change;{str(countChange)};Direction State;{json_state};")
 
 def _debug_log_trigger(triggerState: dict) -> None: