diff --git a/demo/httpsig.py b/demo/httpsig.py
index 98c0647..105ae99 100644
--- a/demo/httpsig.py
+++ b/demo/httpsig.py
@@ -6,16 +6,17 @@ import base64
 import httpx
 import hashlib
 
-from datetime import datetime
-from app import logger
-from demo.config import ID
-
-from dataclasses import dataclass
 from Crypto.Hash import SHA256
 from Crypto.Signature import PKCS1_v1_5
 from Crypto.PublicKey import RSA
 from werkzeug.datastructures import Headers
 from httpx import Headers as Httpx_headers
+from datetime import datetime
+from loguru import logger
+
+from dataclasses import dataclass
+from demo.config import ID
+
 
 
 @dataclass
@@ -158,7 +159,8 @@ class HTTPXSigAuth(httpx.Auth):
 
 
         key_id = f"{ID}#main-key"
-        sig_value = f'keyId="{key_id}",algorithm="rsa-sha256",headers="{sigheaders}",signature="{sig.decode()}"'  # noqa: E501
+        sig_value = f'keyId="{key_id}",algorithm="rsa-sha256",\
+            headers="{sigheaders}",signature="{sig.decode()}"'
         logger.debug(f"signed request {sig_value=}")
         r.headers["signature"] = sig_value
         yield r