diff --git a/check_docker/check_docker.py b/check_docker/check_docker.py
index 1a9d754..a2e242f 100755
--- a/check_docker/check_docker.py
+++ b/check_docker/check_docker.py
@@ -122,10 +122,10 @@ def socket_open(self, req):
 
 # Tokens are not cached because I expect the callers to cache the responses
 class Oauth2TokenAuthHandler(HTTPBasicAuthHandler):
-    auth_failure_tracker = defaultdict(int)
+    auth_failure_tracker : dict[str, int] = defaultdict(int)
 
     def http_response(self, request, response):
-        code, hdrs = response.code, response.headers
+        code= response.code
 
         www_authenticate_header = response.headers.get('www-authenticate', None)
         if code == 401 and www_authenticate_header:
@@ -634,7 +634,7 @@ def check_version(container, insecure_registries):
             return
         else:
             raise e
-    except RegistryError as e:
+    except RegistryError:
         unknown("Cannot check version, couldn't retrieve digest for {} while checking {}.".format(container, url))
         return
     logger.debug("Image digests, local={} remote={}".format(image_id, registry_hash))