diff --git a/docs/changelog.rst b/docs/changelog.rst
index 0c048dc..0325791 100644
--- a/docs/changelog.rst
+++ b/docs/changelog.rst
@@ -1,6 +1,10 @@
 Change history
 ==============
 
+1.3.0a5 (2018-11-20)
+
+* traceback.print_exc() --> logging.error.
+
 1.3.0a4 (2018-11-15)
 
 * Add ErrHandler.handler_assertion_error.
diff --git a/hobbit_core/__init__.py b/hobbit_core/__init__.py
index 1d4711a..77a43c9 100644
--- a/hobbit_core/__init__.py
+++ b/hobbit_core/__init__.py
@@ -1 +1 @@
-VERSION = [1, 3, 0, 'a4']
+VERSION = [1, 3, 0, 'a5']
diff --git a/hobbit_core/flask_hobbit/err_handler.py b/hobbit_core/flask_hobbit/err_handler.py
index 6513fc9..45f3c4d 100644
--- a/hobbit_core/flask_hobbit/err_handler.py
+++ b/hobbit_core/flask_hobbit/err_handler.py
@@ -1,10 +1,12 @@
 # -*- encoding: utf-8 -*-
-import traceback
+import logging
 
 from sqlalchemy.orm import exc as orm_exc
 
 from .response import Result, ServerErrorResult, gen_response, RESP_MSGS
 
+logger = logging.getLogger(__name__)
+
 
 class ErrHandler(object):
     """Base error handler that catch all exceptions. Be sure response is::
@@ -44,7 +46,7 @@ def handler_assertion_error(cls, e):
 
     @classmethod
     def handler_others(cls, e):
-        traceback.print_exc()
+        logging.error('UncheckedException:', exc_info=1)
         return ServerErrorResult(code=500, detail=repr(e))
 
     @classmethod