diff --git a/omise/request.py b/omise/request.py
index 0d08145..17979c2 100644
--- a/omise/request.py
+++ b/omise/request.py
@@ -85,7 +85,6 @@ def send(self, method, path, payload=None, headers=None):
         request_headers = self._build_headers(headers)
 
         logger.info('Sending HTTP request: %s %s', method.upper(), request_path)
-        logger.debug('Authorization: %s', self.api_key)
         logger.debug('Payload: %s', request_payload)
         logger.debug('Headers: %s', request_headers)
 
@@ -108,7 +107,6 @@ def send_file(self, method, path, files=None, headers=None):
         request_headers = self._build_file_header(headers)
 
         logger.info('Sending HTTP request: %s %s', method.upper(), request_path)
-        logger.debug('Authorization: %s', self.api_key)
         logger.debug('Files: %s', request_files)
         logger.debug('Headers: %s', request_headers)
 
@@ -158,4 +156,4 @@ def _build_file_header(self, headers):
         if self.api_version is not None:
             headers['Omise-Version'] = self.api_version
         headers['User-Agent'] = 'OmisePython/%s' % version.__VERSION__
-        return headers
\ No newline at end of file
+        return headers