diff --git a/main.py b/main.py
index 3538895..863394c 100644
--- a/main.py
+++ b/main.py
@@ -5,7 +5,7 @@
 from sockit.server import WebSocketServer
 
 logging.basicConfig(stream=sys.stdout, level=logging.INFO)
-log = logging.getLogger(__name__)
+LOGGER = logging.getLogger(__name__)
 
 
 class Settings:
@@ -17,7 +17,7 @@ def main() -> None:
     loop = asyncio.get_event_loop()
     # Each client connection will create a new protocol instance
     coro = loop.create_server(WebSocketServer, Settings.HOST, Settings.PORT)
-    log.info("start server on {}:{}".format(Settings.HOST, Settings.PORT))
+    LOGGER.info("start server on %s:%s", Settings.HOST, Settings.PORT)
     server = loop.run_until_complete(coro)
     try:
         loop.run_forever()
diff --git a/sockit/server.py b/sockit/server.py
index e627b59..d48c1f5 100644
--- a/sockit/server.py
+++ b/sockit/server.py
@@ -10,7 +10,7 @@
 from sockit.utils import HTTPRequest
 from sockit.websockets import WebsocketRequest, WebsocketResponse
 
-log = logging.getLogger(__name__)
+LOGGER = logging.getLogger(__name__)
 
 
 _minimal_http_version = "1.1"
@@ -50,7 +50,7 @@ def __init__(self) -> None:
 
     def connection_made(self, transport: Transport) -> None:  # type: ignore
         self.transport = transport
-        log.info(f"Connection from {self.peername}")
+        LOGGER.info("Connection from %s", self.peername)
 
     @property
     def peername(self) -> Optional[str]:
@@ -72,11 +72,11 @@ def data_received(self, data: bytes) -> None:
             return self.finalise_handshake(data)
         request = WebsocketRequest(data)
         payload = request.payload()
-        log.info(f"Received data: {payload.decode()}")
+        LOGGER.info("Received data: %s", payload.decode())
 
     def connection_lost(self, exc: Optional[Exception]) -> None:
-        log.info(f"Connection from {self.peername} close")
-        log.warning(f"exc={exc}")
+        LOGGER.info("Connection from %s close", self.peername)
+        LOGGER.warning("exc=%s", exc)
         if self._future:
             self._future.cancel()
         if self.transport:
@@ -89,6 +89,6 @@ async def writer(self, transport: Transport) -> None:
                 response = WebsocketResponse(message).response()
                 transport.write(response)
                 await asyncio.sleep(5)
-        except Exception as exc:
-            log.error(exc)
+        except Exception:
+            LOGGER.exception("Error, closing")
             transport.close()
diff --git a/sockit/websockets.py b/sockit/websockets.py
index babadb8..e575a16 100644
--- a/sockit/websockets.py
+++ b/sockit/websockets.py
@@ -2,7 +2,7 @@
 import logging
 from typing import NamedTuple, Optional
 
-log = logging.getLogger(__name__)
+LOGGER = logging.getLogger(__name__)
 
 
 class WebsocketHeader(ctypes.Union):
@@ -38,7 +38,7 @@ def __str__(self) -> str:
 class WebsocketRequest:
     def __init__(self, data: bytes) -> None:
         self.header = WebsocketHeader(data)
-        log.info(f"Received request: {self.header}")
+        LOGGER.info("Received request: %s", self.header)
         self.data = data
         self.start_byte = 2
         self.length = self._get_length()