diff --git a/src/shared/Authentication.py b/src/shared/Authentication.py
index f561f56..0800239 100644
--- a/src/shared/Authentication.py
+++ b/src/shared/Authentication.py
@@ -41,7 +41,7 @@ def decode_token(token):
     """
     re = {'data': {}, 'error': {}}
     try:
-      payload = jwt.decode(token, os.getenv('JWT_SECRET_KEY'))
+      payload = jwt.decode(token, os.getenv('JWT_SECRET_KEY'), algorithms=['HS256'])
       re['data'] = {'user_id': payload['sub']}
       return re
     except jwt.ExpiredSignatureError as e1: