diff --git a/json_logging/__init__.py b/json_logging/__init__.py
index ce4571d..24894a2 100644
--- a/json_logging/__init__.py
+++ b/json_logging/__init__.py
@@ -20,7 +20,7 @@
 ENABLE_JSON_LOGGING_DEBUG = False
 EMPTY_VALUE = '-'
 CREATE_CORRELATION_ID_IF_NOT_EXISTS = True
-JSON_SERIALIZER = lambda log: json.dumps(log, ensure_ascii=False)
+JSON_SERIALIZER = lambda log: json.dumps(log, ensure_ascii=False, default=str)
 CORRELATION_ID_HEADERS = ['X-Correlation-ID', 'X-Request-ID']
 COMPONENT_ID = EMPTY_VALUE
 COMPONENT_NAME = EMPTY_VALUE