diff --git a/src/oic/extension/sts.py b/src/oic/extension/sts.py
index 160cccdb7..0dd740952 100644
--- a/src/oic/extension/sts.py
+++ b/src/oic/extension/sts.py
@@ -5,6 +5,7 @@
 :license: Apache2, see LICENSE for more details.
 
 """
+
 import json
 
 from oic.oauth2.message import OPTIONAL_LIST_OF_SP_SEP_STRINGS
diff --git a/src/oic/oic/__init__.py b/src/oic/oic/__init__.py
index 83fd165ec..f4b2a503f 100644
--- a/src/oic/oic/__init__.py
+++ b/src/oic/oic/__init__.py
@@ -1240,9 +1240,9 @@ def match_preferences(self, pcr=None, issuer=None):
     def store_registration_info(self, reginfo):
         self.registration_response = reginfo
         if "token_endpoint_auth_method" not in self.registration_response:
-            self.registration_response[
-                "token_endpoint_auth_method"  # nosec
-            ] = "client_secret_basic"
+            self.registration_response["token_endpoint_auth_method"] = (  # nosec
+                "client_secret_basic"
+            )
         self.client_id = reginfo["client_id"]
         try:
             self.client_secret = reginfo["client_secret"]
diff --git a/src/oic/oic/consumer.py b/src/oic/oic/consumer.py
index e8a329b25..e0a856ab2 100644
--- a/src/oic/oic/consumer.py
+++ b/src/oic/oic/consumer.py
@@ -367,9 +367,7 @@ def _parse_authz(self, query="", **kwargs):
         self.redirect_uris = [self.sdb[_state]["redirect_uris"]]
         return aresp, _state
 
-    def parse_authz(
-        self, query="", **kwargs
-    ) -> Union[
+    def parse_authz(self, query="", **kwargs) -> Union[
         http_util.BadRequest,
         Tuple[
             Optional[AuthorizationResponse],
diff --git a/src/oic/utils/clientdb.py b/src/oic/utils/clientdb.py
index 24e20c003..cd2713d33 100644
--- a/src/oic/utils/clientdb.py
+++ b/src/oic/utils/clientdb.py
@@ -1,4 +1,5 @@
 """Client management databases."""
+
 from abc import ABCMeta
 from abc import abstractmethod
 from urllib.parse import quote
diff --git a/src/oic/utils/rp/oauth2.py b/src/oic/utils/rp/oauth2.py
index 923d89afd..a344b2225 100644
--- a/src/oic/utils/rp/oauth2.py
+++ b/src/oic/utils/rp/oauth2.py
@@ -116,9 +116,9 @@ def callback(self, response, session, format="dict"):
         :return:
         """
         if self.behaviour["response_type"] == "code":
-            respcls: Union[
-                Type[AuthorizationResponse], Type[AccessTokenResponse]
-            ] = AuthorizationResponse
+            respcls: Union[Type[AuthorizationResponse], Type[AccessTokenResponse]] = (
+                AuthorizationResponse
+            )
         else:
             respcls = AccessTokenResponse
 
diff --git a/src/oic/utils/settings.py b/src/oic/utils/settings.py
index 77ea6a37a..e88ea4be4 100644
--- a/src/oic/utils/settings.py
+++ b/src/oic/utils/settings.py
@@ -12,6 +12,7 @@
 The settings make use of `pydantic-settings <https://docs.pydantic.dev/usage/settings/>`_ library.
 It is possible to instance them directly or use environment values to fill the settings.
 """
+
 from typing import Optional
 from typing import Tuple
 from typing import Union
diff --git a/tests/conftest.py b/tests/conftest.py
index 5d4b68240..f93b4fa61 100644
--- a/tests/conftest.py
+++ b/tests/conftest.py
@@ -1,4 +1,5 @@
 """Pytest fixtures for testing."""
+
 from typing import Any
 from typing import Dict
 
diff --git a/tests/test_clientdb.py b/tests/test_clientdb.py
index 2e95a4f4e..fc6529c83 100644
--- a/tests/test_clientdb.py
+++ b/tests/test_clientdb.py
@@ -1,4 +1,5 @@
 """Unittests for ClientDatabases."""
+
 import json
 from operator import itemgetter
 from typing import Any
diff --git a/tests/test_x_provider.py b/tests/test_x_provider.py
index 80f54706a..b70fc1f32 100644
--- a/tests/test_x_provider.py
+++ b/tests/test_x_provider.py
@@ -512,9 +512,9 @@ def test_password_grant_type_ok(self):
         areq = ROPCAccessTokenRequest(
             grant_type="password", username="username", password="password"
         )
-        areq[
-            "client_id"
-        ] = "client1"  # Token endpoint would fill that in based on client_authn
+        areq["client_id"] = (
+            "client1"  # Token endpoint would fill that in based on client_authn
+        )
         resp = self.provider.password_grant_type(areq)
 
         atr = AccessTokenResponse().deserialize(resp.message, "json")
@@ -527,9 +527,9 @@ def test_password_grant_type_no_authn(self):
         areq = ROPCAccessTokenRequest(
             grant_type="password", username="username", password="password"
         )
-        areq[
-            "client_id"
-        ] = "client1"  # Token endpoint would fill that in based on client_authn
+        areq["client_id"] = (
+            "client1"  # Token endpoint would fill that in based on client_authn
+        )
         resp = self.provider.password_grant_type(areq)
 
         atr = TokenErrorResponse().deserialize(resp.message, "json")
@@ -542,9 +542,9 @@ def test_password_grant_type_bad(self):
         areq = ROPCAccessTokenRequest(
             grant_type="password", username="username", password="bad_password"
         )
-        areq[
-            "client_id"
-        ] = "client1"  # Token endpoint would fill that in based on client_authn
+        areq["client_id"] = (
+            "client1"  # Token endpoint would fill that in based on client_authn
+        )
         resp = self.provider.password_grant_type(areq)
 
         atr = TokenErrorResponse().deserialize(resp.message, "json")