diff --git a/app/dao/services_dao.py b/app/dao/services_dao.py
index b9de79859..58ae9ea3d 100644
--- a/app/dao/services_dao.py
+++ b/app/dao/services_dao.py
@@ -544,8 +544,8 @@ def dao_find_services_sending_to_tv_numbers(start_date, end_date, threshold=500)
         Notification.notification_type == SMS_TYPE,
         func.substr(Notification.normalised_to, 3, 7) == '7700900',
         Service.restricted == False,  # noqa
-        Service.research_mode == False,
-        Service.active == True,
+        Service.research_mode == False,  # noqa
+        Service.active == True,  # noqa
     ).group_by(
         Notification.service_id,
     ).having(
@@ -564,8 +564,8 @@ def dao_find_services_with_high_failure_rates(start_date, end_date, threshold=10
         Notification.key_type != KEY_TYPE_TEST,
         Notification.notification_type == SMS_TYPE,
         Service.restricted == False,  # noqa
-        Service.research_mode == False,
-        Service.active == True,
+        Service.research_mode == False,  # noqa
+        Service.active == True,  # noqa
     ).group_by(
         Notification.service_id,
     ).having(
@@ -590,8 +590,8 @@ def dao_find_services_with_high_failure_rates(start_date, end_date, threshold=10
         Notification.notification_type == SMS_TYPE,
         Notification.status == NOTIFICATION_PERMANENT_FAILURE,
         Service.restricted == False,  # noqa
-        Service.research_mode == False,
-        Service.active == True,
+        Service.research_mode == False,  # noqa
+        Service.active == True,  # noqa
     ).group_by(
         Notification.service_id,
         subquery.c.total_count
diff --git a/app/dao/uploads_dao.py b/app/dao/uploads_dao.py
index cb04617a9..29fa25fb8 100644
--- a/app/dao/uploads_dao.py
+++ b/app/dao/uploads_dao.py
@@ -84,7 +84,7 @@ def dao_get_uploads_by_service_id(service_id, limit_days=None, page=1, page_size
         Notification.notification_type == LETTER_TYPE,
         Notification.api_key_id == None,  # noqa
         Notification.status != NOTIFICATION_CANCELLED,
-        Template.hidden == True,
+        Template.hidden == True,  # noqa
         Notification.created_at >= today - func.coalesce(ServiceDataRetention.days_of_retention, 7)
     ]
     if limit_days is not None:
diff --git a/requirements_for_test.txt b/requirements_for_test.txt
index 36464b7b7..56e180c0e 100644
--- a/requirements_for_test.txt
+++ b/requirements_for_test.txt
@@ -1,5 +1,5 @@
 -r requirements.txt
-flake8==3.8.4
+flake8==4.0.1
 flake8-bugbear==20.11.1
 isort==5.7.0
 moto==2.0.11