diff --git a/app/controllers/cardManager.py b/app/controllers/cardManager.py
index c5ca4af..128c739 100644
--- a/app/controllers/cardManager.py
+++ b/app/controllers/cardManager.py
@@ -69,7 +69,7 @@ def del_card(
         logger.info(f"The key:'{key}' was not found in db!")
         raise HTTPException(
             status.HTTP_500_INTERNAL_SERVER_ERROR,
-            detail="Key on card not found in DB. Please tell an admin about this. KEY={key}",
+            detail="Key on card not found in DB. Please tell an admin about this. KEY={key}",  # noqa: E501
         )
     db.delete(card)
     db.commit()
diff --git a/app/main.py b/app/main.py
index ee17ddf..f8312e9 100644
--- a/app/main.py
+++ b/app/main.py
@@ -1,6 +1,4 @@
 import logging
-
-logger = logging.getLogger(__name__)
 import os
 from contextlib import asynccontextmanager
 
@@ -11,6 +9,7 @@ from fastapi.security import OAuth2PasswordBearer
 
 load_dotenv()
 
+# ruff: disable[E402]
 from app.controllers import (
     aaManager,
     cardManager,
@@ -24,6 +23,10 @@ from app.services.database import create_db_and_tables, get_db_session
 from app.services.scanner import BackgroundScanner
 from app.services.settings import verify_settings
 
+# ruff: enable[E402]
+
+logger = logging.getLogger(__name__)
+
 oauth2_scheme = OAuth2PasswordBearer(tokenUrl="token")
 scanner = BackgroundScanner(db=get_db_session())
 logging.basicConfig(level=logging.INFO)
diff --git a/app/services/settings.py b/app/services/settings.py
index 4a5a2bf..9507e82 100644
--- a/app/services/settings.py
+++ b/app/services/settings.py
@@ -17,7 +17,7 @@ def verify_settings():
             "DISABLE_CARDS"
         ):
             raise ValueError(
-                f"Missing environment variable for scanner start: {setting} \n Run with DISABLE_CARDS env var to disable cards"
+                f"Missing environment variable for scanner start: {setting} \n Run with DISABLE_CARDS env var to disable cards"  # noqa: E501
             )
     for setting in important_envs:
         if setting not in os.environ or setting == "":
diff --git a/pyproject.toml b/pyproject.toml
index d6ec8a2..d911fe8 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -31,6 +31,20 @@ python-desfire = ["poetry"]
 py-modules = ["app"]
 
 [tool.ruff]
-exclude = [
-    "alembic"
-]
\ No newline at end of file
+exclude = ["alembic"]
+[tool.ruff.lint]
+select = [
+    # pycodestyle
+    "E",
+    # Pyflakes
+    "F",
+    # pyupgrade
+    "UP",
+    # flake8-bugbear
+    "B",
+    # flake8-simplify
+    "SIM",
+    # isort
+    "I",
+]
+ignore = ["B008"]
\ No newline at end of file
diff --git a/test/test_services/test_card_manager.py b/test/test_services/test_card_manager.py
index b76ec14..1992ba9 100644
--- a/test/test_services/test_card_manager.py
+++ b/test/test_services/test_card_manager.py
@@ -39,7 +39,7 @@ def test_update_card(client, auth_headers, test_group, test_card):
 
     data = response.json()
     assert data["name"] == "changed_name"
-    assert data["enabled"] == False
+    assert data["enabled"] == False  # noqa: E712
     assert data["group_id"] == test_card.group_id
 
 
diff --git a/test/test_services/test_door.py b/test/test_services/test_door.py
index e733738..855a185 100644
--- a/test/test_services/test_door.py
+++ b/test/test_services/test_door.py
@@ -42,8 +42,7 @@ def test_check_access_with_valid_timetable(db_session):
     db_session.commit()
 
     # Test: access should be granted within time window
-    result = checkAccess("test-key-123", db_session)
-    assert result == True
+    assert checkAccess("test-key-123", db_session)
 
 
 def test_check_access_outside_hours(db_session):
@@ -74,8 +73,7 @@ def test_check_access_outside_hours(db_session):
     group.accessauths = [aa]
 
     db_session.commit()
-    result = checkAccess("test-key-123", db_session)
-    assert result == False
+    assert not checkAccess("test-key-123", db_session)
 
 
 def test_check_access_with_valid_oneshot(db_session):
@@ -106,8 +104,7 @@ def test_check_access_with_valid_oneshot(db_session):
     db_session.commit()
 
     # Test: access should be granted within time window
-    result = checkAccess("test-key-123", db_session)
-    assert result == True
+    assert checkAccess("test-key-123", db_session)
     assert aa.oneshot.uses == 0