diff --git a/flake.nix b/flake.nix
index 63238ed6..da425a7e 100644
--- a/flake.nix
+++ b/flake.nix
@@ -91,6 +91,7 @@
 
                     # Dev dependencies
                     isort
+                    flake8
                 ];
             in
               pkgs.mkShell {
diff --git a/oar/api/auth.py b/oar/api/auth.py
index 7822ae82..818b2190 100644
--- a/oar/api/auth.py
+++ b/oar/api/auth.py
@@ -15,7 +15,6 @@
 def get_token_data(
     credentials: Annotated[str, Depends(oauth2_scheme)], config=Depends(get_config)
 ) -> Optional[dict]:
-
     token = credentials.credentials
 
     # FIXME: HAndlre er
diff --git a/oar/api/routers/job.py b/oar/api/routers/job.py
index 501212c1..e1c1429f 100644
--- a/oar/api/routers/job.py
+++ b/oar/api/routers/job.py
@@ -11,9 +11,9 @@
 from oar.cli.oarhold import oarhold
 from oar.cli.oarresume import oarresume
 from oar.lib.configuration import Configuration
+from oar.lib.job_handling import convert_status_code
 from oar.lib.models import Job
 from oar.lib.submission import JobParameters, Submission, check_reservation
-from oar.lib.job_handling import convert_status_code
 
 from ..auth import need_authentication
 from ..dependencies import get_config, get_db
@@ -53,11 +53,13 @@ def attach_nodes(job, jobs_resources):
             job["nodes"].append(node)
             network_addresses.append(node["network_address"])
 
+
 def attach_exit_status(job):
-    if 'exit_code' in job and job["exit_code"] is not None:
-      job["exit_status_code"] = convert_status_code(job["exit_code"])
+    if "exit_code" in job and job["exit_code"] is not None:
+        job["exit_status_code"] = convert_status_code(job["exit_code"])
     else:
-      job["exit_status_code"] = None
+        job["exit_status_code"] = None
+
 
 @router.get("")
 @router.get("/")
diff --git a/oar/api/routers/proxy.py b/oar/api/routers/proxy.py
index 4bb19d97..06f9d58d 100644
--- a/oar/api/routers/proxy.py
+++ b/oar/api/routers/proxy.py
@@ -41,7 +41,6 @@ def proxy(
     db: Session = Depends(get_db),
     config: Configuration = Depends(get_config),
 ):
-
     if "OARDIR" not in os.environ:
         os.environ["OARDIR"] = "/usr/local/lib/oar"
 
diff --git a/oar/cli/oarnodesetting.py b/oar/cli/oarnodesetting.py
index bd29ee1a..819fc310 100644
--- a/oar/cli/oarnodesetting.py
+++ b/oar/cli/oarnodesetting.py
@@ -399,7 +399,6 @@ def cli(
     last_property_value,
     version,
 ):
-
     ctx = click.get_current_context()
     if ctx.obj:
         (session, config) = ctx.obj
diff --git a/oar/cli/oarstat.py b/oar/cli/oarstat.py
index 682fda1c..72f23dc5 100644
--- a/oar/cli/oarstat.py
+++ b/oar/cli/oarstat.py
@@ -581,7 +581,6 @@ def cli(
     yaml,
     version,
 ):
-
     ctx = click.get_current_context()
     if ctx.obj:
         session = ctx.obj
@@ -649,7 +648,9 @@ def cli(
 
         for job in jobs:
             job.cpuset_name = get_job_cpuset_name(session, job.id, job=job)
-            job.exit_status_code = str(get_job_exit_status_code(session, job.id, job=job))
+            job.exit_status_code = str(
+                get_job_exit_status_code(session, job.id, job=job)
+            )
 
         print_jobs(session, True, jobs, format, show_resources, full)
 
diff --git a/oar/kao/quotas.py b/oar/kao/quotas.py
index 55d3afed..59ed50e6 100644
--- a/oar/kao/quotas.py
+++ b/oar/kao/quotas.py
@@ -313,7 +313,6 @@ def next_rules(self, t_epoch):
         return (rules_id, remaining_duration)
 
     def show(self, t=None, begin=None, end=None, check=True, json=False):
-
         t_epoch = None
         if t:
             try:
diff --git a/oar/lib/accounting.py b/oar/lib/accounting.py
index c6ed26f5..931df3fc 100644
--- a/oar/lib/accounting.py
+++ b/oar/lib/accounting.py
@@ -305,7 +305,9 @@ def check_accounting_update(session: Session, window_size: int):
             nb_resources,
         )
 
-        session.query(Job).filter(Job.accounted == "NO").update({Job.accounted: "YES"}, synchronize_session=False)
+        session.query(Job).filter(Job.accounted == "NO").update(
+            {Job.accounted: "YES"}, synchronize_session=False
+        )
 
     session.commit()
 
diff --git a/oar/lib/basequery.py b/oar/lib/basequery.py
index 2ad7729c..2bab67e8 100644
--- a/oar/lib/basequery.py
+++ b/oar/lib/basequery.py
@@ -7,8 +7,8 @@
 # from . import db
 from .exceptions import DoesNotExist
 from .models import (
-    EventLog,
     AssignedResource,
+    EventLog,
     GanttJobsPredictionsVisu,
     GanttJobsResourcesVisu,
     Job,
@@ -268,7 +268,14 @@ def get_jobs_events(self, jobs):
         """Returns the list of events associated to the job passed
         in parameter."""
         db = self.session
-        columns = (EventLog.id, EventLog.date, EventLog.description, EventLog.type, EventLog.to_check, EventLog.job_id)
+        columns = (
+            EventLog.id,
+            EventLog.date,
+            EventLog.description,
+            EventLog.type,
+            EventLog.to_check,
+            EventLog.job_id,
+        )
         query = (
             db.query(Job.id, EventLog)
             .options(Load(EventLog).load_only(*columns))
@@ -285,11 +292,18 @@ def get_one_job_events(self, job):
         """Returns the list of events associated to the job passed
         in parameter."""
         db = self.session
-        columns = (EventLog.id, EventLog.date, EventLog.description, EventLog.type, EventLog.to_check, EventLog.job_id)
+        columns = (
+            EventLog.id,
+            EventLog.date,
+            EventLog.description,
+            EventLog.type,
+            EventLog.to_check,
+            EventLog.job_id,
+        )
         query = (
             db.query(EventLog)
             .options(Load(EventLog).load_only(*columns))
-            .filter_by(job_id = job.id)
+            .filter_by(job_id=job.id)
         )
         return query
 
diff --git a/oar/lib/submission.py b/oar/lib/submission.py
index be21ea82..6b846335 100644
--- a/oar/lib/submission.py
+++ b/oar/lib/submission.py
@@ -293,7 +293,6 @@ def apply_admission_rules(
     if ("ADMISSION_RULES_IN_FILES" in config) and (
         config["ADMISSION_RULES_IN_FILES"] == "yes"
     ):
-
         if rule:
             regex = rule
         else:
diff --git a/oar/lib/tools.py b/oar/lib/tools.py
index ee9a53d3..b139dec0 100644
--- a/oar/lib/tools.py
+++ b/oar/lib/tools.py
@@ -141,7 +141,6 @@ def create_almighty_socket(server_hostname: str, server_port: str):  # pragma: n
 def notify_almighty(
     cmd: str, job_id: Optional[int] = None, args: Optional[List[str]] = None
 ) -> bool:  # pragma: no cover
-
     if not almighty_socket:
         create_almighty_socket(
             config["SERVER_HOSTNAME"], config["APPENDICE_SERVER_PORT"]
diff --git a/scripts/ci/check-formatting.sh b/scripts/ci/check-formatting.sh
index 3ee29972..3486d857 100755
--- a/scripts/ci/check-formatting.sh
+++ b/scripts/ci/check-formatting.sh
@@ -11,11 +11,11 @@ set -e
 
 echo "-- Check imports"
 isort --version
-isort . --check-only --diff
+isort oar tests --check-only --diff
 
 echo "-- Check code formatting"
 black --version
-black . --check --diff
+black oar tests --check --diff
 
 echo "-- Static code check"
 flake8 --version
diff --git a/tests/api/conftest.py b/tests/api/conftest.py
index ede1681c..9f5b0637 100644
--- a/tests/api/conftest.py
+++ b/tests/api/conftest.py
@@ -47,7 +47,6 @@ def assign_node_list(nodes):  # TODO TOREPLACE
 
 
 def write_banned_file(config):
-
     now = datetime.utcnow().strftime("%Y-%m-%d %H:%M:%S")
 
     banned_file = f"""
diff --git a/tests/api/test_api_tokens.py b/tests/api/test_api_tokens.py
index b0655c4a..30dc5182 100644
--- a/tests/api/test_api_tokens.py
+++ b/tests/api/test_api_tokens.py
@@ -26,7 +26,6 @@ def test_invalid_token(client):
     [("bob", 200), ("globally_revoked_token", 401), ("old_token", 401)],
 )
 def test_token_revocation(client, user_tokens, user, status_code):
-
     res = client.get(
         "/check_token",
         headers={"Authorization": f"Bearer {user_tokens[user]}"},
diff --git a/tests/cli/test_oarqueue.py b/tests/cli/test_oarqueue.py
index 2d833604..bfbcf59d 100644
--- a/tests/cli/test_oarqueue.py
+++ b/tests/cli/test_oarqueue.py
@@ -18,7 +18,6 @@ def minimal_db_initialization(request, setup_config):
     scoped = scoped_session(session_factory)
 
     with ephemeral_session(scoped, engine, bind=engine) as session:
-
         Queue.create(session, name="default", scheduler_policy="kao", state="unkown")
         yield session
 
diff --git a/tests/conftest.py b/tests/conftest.py
index acbbd1bd..3037fca9 100644
--- a/tests/conftest.py
+++ b/tests/conftest.py
@@ -91,7 +91,6 @@ def backup_and_restore_environ_function(request):
     """
     old_environ = dict(os.environ)
     try:
-
         yield
 
     finally:
@@ -106,7 +105,6 @@ def backup_and_restore_environ_module(request):
     """
     old_environ = dict(os.environ)
     try:
-
         yield
 
     finally:
diff --git a/tests/kao/test_db_all_in_one.py b/tests/kao/test_db_all_in_one.py
index 7f1083eb..22c46c44 100644
--- a/tests/kao/test_db_all_in_one.py
+++ b/tests/kao/test_db_all_in_one.py
@@ -783,7 +783,6 @@ def test_db_all_in_one_sleep_node_1(
 def test_db_all_in_one_wakeup_node_energy_saving_internal_1(
     monkeypatch, minimal_db_initialization, setup_config, active_energy_saving
 ):
-
     config = active_energy_saving
 
     config["ENERGY_SAVING_INTERNAL"] = "yes"
diff --git a/tests/kao/test_db_all_in_one_others.py b/tests/kao/test_db_all_in_one_others.py
index 7a36c8cd..0e0a5183 100644
--- a/tests/kao/test_db_all_in_one_others.py
+++ b/tests/kao/test_db_all_in_one_others.py
@@ -17,7 +17,6 @@ def minimal_db_initialization(request, setup_config):
     scoped = scoped_session(session_factory)
 
     with ephemeral_session(scoped, engine, bind=engine) as session:
-
         Queue.create(
             session,
             name="default",
diff --git a/tests/kao/test_db_suspend_resume.py b/tests/kao/test_db_suspend_resume.py
index 5aff04c1..434057a1 100644
--- a/tests/kao/test_db_suspend_resume.py
+++ b/tests/kao/test_db_suspend_resume.py
@@ -16,7 +16,6 @@ def minimal_db_initialization(request, setup_config):
     scoped = scoped_session(session_factory)
 
     with ephemeral_session(scoped, engine, bind=engine) as session:
-
         Queue.create(
             session,
             name="default",
diff --git a/tests/kao/test_temporal_quotas.py b/tests/kao/test_temporal_quotas.py
index a29eff82..35102b54 100644
--- a/tests/kao/test_temporal_quotas.py
+++ b/tests/kao/test_temporal_quotas.py
@@ -142,7 +142,6 @@ def period_weekstart():
 
 
 def test_calendar_periodical_fromJson(oar_conf):
-
     calendar = Calendar(rules_example_full, oar_conf)
     print()
     calendar.show()
diff --git a/tests/modules/test_bipbip_commander.py b/tests/modules/test_bipbip_commander.py
index c0d2103f..c7d61850 100644
--- a/tests/modules/test_bipbip_commander.py
+++ b/tests/modules/test_bipbip_commander.py
@@ -53,7 +53,13 @@ def test_bipbip_commander_OAREXEC(setup):
     # exitcode = bipbip_commander.bipbip_leon_executors[10].exitcode
     print("helloe", fake_popen)
     assert bipbip_commander.bipbip_leon_commands_to_run == []
-    assert ["/usr/local/lib/oar/oar-bipbip", "10", "2", "N", "34",] == fake_popen[
+    assert [
+        "/usr/local/lib/oar/oar-bipbip",
+        "10",
+        "2",
+        "N",
+        "34",
+    ] == fake_popen[
         "cmd"
     ].split(" ")
 
diff --git a/tests/modules/test_node_change_state.py b/tests/modules/test_node_change_state.py
index 82061f40..47ee3de3 100644
--- a/tests/modules/test_node_change_state.py
+++ b/tests/modules/test_node_change_state.py
@@ -420,7 +420,6 @@ def test_node_change_state_resource_dead_assigned(
 
 
 def assign_resources_with_range(session, job_id, from_, to_):
-
     moldable = (
         session.query(MoldableJobDescription)
         .filter(MoldableJobDescription.job_id == job_id)