diff --git a/.prospector.yaml b/.prospector.yaml
index 970d3d7..33e0489 100644
--- a/.prospector.yaml
+++ b/.prospector.yaml
@@ -43,6 +43,8 @@ pylint:
     - assignment-from-none
     - redefined-outer-name
     - no-self-argument
+    - unnecessary-pass
+    - logging-fstring-interpolation
   options:
     max-locals: 25
     max-line-length: 120
diff --git a/py_ocpi/core/authentication/authenticator.py b/py_ocpi/core/authentication/authenticator.py
index 8e4f19e..422b86c 100644
--- a/py_ocpi/core/authentication/authenticator.py
+++ b/py_ocpi/core/authentication/authenticator.py
@@ -1,6 +1,6 @@
 from abc import ABC, abstractmethod
 
-from typing import List
+from typing import List, Union
 
 from py_ocpi.core.exceptions import AuthorizationOCPIError
 from py_ocpi.core.config import logger
@@ -18,26 +18,26 @@ async def authenticate(cls, auth_token: str) -> None:
         """
         list_token_c = await cls.get_valid_token_c()
         if auth_token not in list_token_c:
-            logger.debug("Given `%s` token is not valid" % auth_token)
+            logger.debug(f"Given `{auth_token}` token is not valid")
             raise AuthorizationOCPIError
 
     @classmethod
     async def authenticate_credentials(
         cls,
         auth_token: str,
-    ) -> str | dict | None:
+    ) -> Union[str, dict, None]:
         """Authenticate given auth token where both tokens valid."""
         if auth_token:
             list_token_a = await cls.get_valid_token_a()
             if auth_token in list_token_a:
-                logger.debug("Token A `%s` is used." % auth_token)
+                logger.debug(f"Token A `{auth_token}` is used.")
                 return {}
 
             list_token_c = await cls.get_valid_token_c()
             if auth_token in list_token_c:
-                logger.debug("Token C `%s` is used." % auth_token)
+                logger.debug(f"Token C `{auth_token}` is used.")
                 return auth_token
-        logger.debug("Token `%s` is not of type A or C." % auth_token)
+        logger.debug(f"Token `{auth_token}` is not of type A or C.")
         return None
 
     @classmethod
diff --git a/py_ocpi/core/authentication/verifier.py b/py_ocpi/core/authentication/verifier.py
index 9878a8c..2dc5301 100644
--- a/py_ocpi/core/authentication/verifier.py
+++ b/py_ocpi/core/authentication/verifier.py
@@ -1,3 +1,5 @@
+from typing import Union
+
 from fastapi import (
     Depends,
     Header,
@@ -61,19 +63,19 @@ async def __call__(
             if self.version.startswith("2.2"):
                 try:
                     token = decode_string_base64(token)
-                except UnicodeDecodeError:
+                except UnicodeDecodeError as exc:
                     logger.debug(
-                        "Token `%s` cannot be decoded. "
-                        "Check if the token is already encoded." % token
+                        f"Token `{token}` cannot be decoded. "
+                        "Check if the token is already encoded."
                     )
-                    raise AuthorizationOCPIError
+                    raise AuthorizationOCPIError from exc
             await authenticator.authenticate(token)
-        except IndexError:
+        except IndexError as exc:
             logger.debug(
                 "Token `%s` cannot be split in parts. "
                 "Check if it starts with `Token `"
             )
-            raise AuthorizationOCPIError
+            raise AuthorizationOCPIError from exc
 
 
 class CredentialsAuthorizationVerifier:
@@ -84,14 +86,14 @@ class CredentialsAuthorizationVerifier:
     :param version (VersionNumber): OCPI version used.
     """
 
-    def __init__(self, version: VersionNumber | None) -> None:
+    def __init__(self, version: Union[VersionNumber, None]) -> None:
         self.version = version
 
     async def __call__(
         self,
         authorization: str = Security(api_key_header),
         authenticator: Authenticator = Depends(get_authenticator),
-    ) -> str | dict | None:
+    ) -> Union[str, dict, None]:
         """
         Verifies the authorization token using the specified version
         and an Authenticator.
@@ -106,23 +108,20 @@ async def __call__(
         """
         try:
             token = authorization.split()[1]
-        except IndexError:
-            logger.debug(
-                "Token `%s` cannot be split in parts. "
-                "Check if it starts with `Token `"
-            )
-            raise AuthorizationOCPIError
+        except IndexError as exc:
+            logger.debug("Token cannot be split in parts. Check if it starts with `Token `")
+            raise AuthorizationOCPIError from exc
 
         if self.version:
             if self.version.startswith("2.2"):
                 try:
                     token = decode_string_base64(token)
-                except UnicodeDecodeError:
+                except UnicodeDecodeError as exc:
                     logger.debug(
-                        "Token `%s` cannot be decoded. "
-                        "Check if the token is already encoded." % token
+                        f"Token `{token}` cannot be decoded. "
+                        "Check if the token is already encoded."
                     )
-                    raise AuthorizationOCPIError
+                    raise AuthorizationOCPIError from exc
         else:
             try:
                 token = decode_string_base64(token)
@@ -141,7 +140,7 @@ async def __call__(
         self,
         authorization: str = auth_verifier,
         authenticator: Authenticator = Depends(get_authenticator),
-    ) -> str | dict | None:
+    ) -> Union[str, dict, None]:
         """
         Verifies the authorization token using the specified version
         and an Authenticator for version endpoints.
@@ -194,19 +193,19 @@ async def __call__(
             if version.value.startswith("2.2"):
                 try:
                     token = decode_string_base64(token)
-                except UnicodeDecodeError:
+                except UnicodeDecodeError as exc:
                     logger.debug(
-                        "Token `%s` cannot be decoded. "
-                        "Check if the token is already encoded." % token
+                        f"Token `{token}` cannot be decoded. "
+                        "Check if the token is already encoded."
                     )
-                    raise AuthorizationOCPIError
+                    raise AuthorizationOCPIError from exc
             await authenticator.authenticate(token)
-        except IndexError:
+        except IndexError as exc:
             logger.debug(
-                "Token `%s` cannot be split in parts. "
+                "Token cannot be split in parts. "
                 "Check if it starts with `Token `"
             )
-            raise AuthorizationOCPIError
+            raise AuthorizationOCPIError from exc
 
 
 class WSPushVerifier:
@@ -233,7 +232,7 @@ async def __call__(
         :raises AuthorizationOCPIError: If there is an issue with
           the authorization token.
         """
-        if settings.NO_AUTH and token == "":
+        if settings.NO_AUTH and token == "":  # nosec
             logger.debug("Authentication skipped due to NO_AUTH setting.")
             return True
 
@@ -245,12 +244,12 @@ async def __call__(
             if version.value.startswith("2.2"):
                 try:
                     token = decode_string_base64(token)
-                except UnicodeDecodeError:
+                except UnicodeDecodeError as exc:
                     logger.debug(
-                        "Token `%s` cannot be decoded. "
-                        "Check if the token is already encoded." % token
+                        f"Token `{token}` cannot be decoded. "
+                        "Check if the token is already encoded."
                     )
-                    raise AuthorizationOCPIError
+                    raise AuthorizationOCPIError from exc
             await authenticator.authenticate(token)
-        except AuthorizationOCPIError:
-            raise WebSocketException(code=status.WS_1008_POLICY_VIOLATION)
+        except AuthorizationOCPIError as exc:
+            raise WebSocketException(code=status.WS_1008_POLICY_VIOLATION) from exc
diff --git a/py_ocpi/core/push.py b/py_ocpi/core/push.py
index f7ab3e9..f9a4383 100644
--- a/py_ocpi/core/push.py
+++ b/py_ocpi/core/push.py
@@ -104,16 +104,15 @@ async def push_object(
 
         async with httpx.AsyncClient() as client:
             logger.info(
-                "Send request to get version details: %s"
-                % receiver.endpoints_url
+                f"Send request to get version details: {receiver.endpoints_url}"
             )
             response = await client.get(
                 receiver.endpoints_url,
                 headers={"authorization": client_auth_token},
             )
-            logger.info("Response status_code - `%s`" % response.status_code)
+            logger.info(f"Response status_code - `{response.status_code}`")
             endpoints = response.json()["data"]["endpoints"]
-            logger.debug("Endpoints response data - `%s`" % endpoints)
+            logger.debug(f"Endpoints response data - `{endpoints}`")
 
         # get object data
         if push.module_id == ModuleID.tokens:
@@ -126,7 +125,7 @@ async def push_object(
                 version=version,
             )
         else:
-            logger.debug("Requested module with push is `%s`." % push.module_id)
+            logger.debug(f"Requested module with push is `{push.module_id}`.")
             data = await crud.get(
                 push.module_id,
                 RoleEnum.cpo,
@@ -162,7 +161,7 @@ async def push_object(
                 )
             )
     result = PushResponse(receiver_responses=receiver_responses)
-    logger.debug("Result of push operation - %s" % result.dict())
+    logger.debug(f"Result of push operation - {result.dict()}")
     return result
 
 
@@ -186,7 +185,7 @@ async def http_push_to_client(
     adapter: Adapter = Depends(get_adapter),
 ):
     logger.info("Received push http request.")
-    logger.debug("Received push data - `%s`" % push.dict())
+    logger.debug(f"Received push data - `{push.dict()}`")
     auth_token = get_auth_token(request, version)
 
     return await push_object(version, push, crud, adapter, auth_token)
@@ -210,10 +209,10 @@ async def websocket_push_to_client(
 
     while True:
         data = await websocket.receive_json()
-        logger.debug("Received data through ws - `%s`" % data)
+        logger.debug(f"Received data through ws - `{data}`")
         push = Push(**data)
         push_response = await push_object(
             version, push, crud, adapter, auth_token
         )
-        logger.debug("Sending push response - `%s`" % push_response.dict())
+        logger.debug(f"Sending push response - `{push_response.dict()}`")
         await websocket.send_json(push_response.dict())
diff --git a/py_ocpi/core/utils.py b/py_ocpi/core/utils.py
index d06e464..940f10e 100644
--- a/py_ocpi/core/utils.py
+++ b/py_ocpi/core/utils.py
@@ -87,7 +87,7 @@ def get_module_model(class_name, module_name: str, version_name: str) -> Any:
     try:
         module = importlib.import_module(module_dir)
         return getattr(module, class_name)
-    except ImportError:
+    except ImportError as exc:
         raise NotImplementedError(
             f"{class_name} schema for version {version_name} not found.",
-        )
+        ) from exc
diff --git a/py_ocpi/main.py b/py_ocpi/main.py
index c19a4a0..55793da 100644
--- a/py_ocpi/main.py
+++ b/py_ocpi/main.py
@@ -10,7 +10,7 @@
 )
 from py_ocpi.core.endpoints import ENDPOINTS
 
-from py_ocpi.modules.versions import router as versions_router
+from py_ocpi.modules.versions.main import router as versions_router
 from py_ocpi.modules.versions.enums import VersionNumber
 from py_ocpi.modules.versions.schemas import Version
 from py_ocpi.core.dependencies import (
@@ -39,8 +39,8 @@ class ExceptionHandlerMiddleware(BaseHTTPMiddleware):
     async def dispatch(
         self, request: Request, call_next: RequestResponseEndpoint
     ):
-        logger.debug("%s: %s" % (request.method, request.url))
-        logger.debug("Request headers - %s" % request.headers)
+        logger.debug(f"{request.method}: {request.url}")
+        logger.debug(f"Request headers - {request.headers}" )
 
         try:
             response = await call_next(request)
@@ -64,7 +64,7 @@ async def dispatch(
                     **status.OCPI_3000_GENERIC_SERVER_ERROR,
                 ).dict()
             )
-        except Exception as e:
+        except Exception as e:  # pylint: disable=broad-exception-caught
             logger.warning(f"Unknown exception: {str(e)}.")
             response = JSONResponse(
                 OCPIResponse(
@@ -77,7 +77,7 @@ async def dispatch(
         return response
 
 
-def get_application(
+def get_application(  # noqa: MC0001
     version_numbers: List[VersionNumber],
     roles: List[RoleEnum],
     crud: Any,
diff --git a/py_ocpi/modules/versions/main.py b/py_ocpi/modules/versions/main.py
index d618101..3a88a81 100644
--- a/py_ocpi/modules/versions/main.py
+++ b/py_ocpi/modules/versions/main.py
@@ -28,7 +28,7 @@ async def get_versions(
     request: Request,
     versions=Depends(get_versions_),
     crud: Crud = Depends(get_crud),
-    server_cred: str | dict | None = Depends(cred_dependency),
+    server_cred: Unione[str, dict, None] = Depends(cred_dependency),
 ):
     """
     Get OCPI Versions.
@@ -38,7 +38,7 @@ async def get_versions(
     **Returns:**
         The OCPIResponse containing a list of available OCPI versions.
     """
-    logger.info("Received request for version details: %s" % request.url)
+    logger.info(f"Received request for version details: {request.url}")
     if server_cred is None:
         logger.debug("Unauthorized request.")
         raise HTTPException(