diff --git a/Dockerfile b/Dockerfile
index 43f73113..6804e7a7 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,4 +1,4 @@
-ARG PYTHON_VERSION="3.9.6-slim-buster"
+ARG PYTHON_VERSION="3.8.12-slim-buster"
 ARG NODE_VERSION="16.5-alpine3.14"
 FROM node:${NODE_VERSION} AS frontend-builder
 
diff --git a/backend/Dockerfile.dev b/backend/Dockerfile.dev
index e7c47e7e..6e08d3bf 100644
--- a/backend/Dockerfile.dev
+++ b/backend/Dockerfile.dev
@@ -1,4 +1,4 @@
-ARG PYTHON_VERSION="3.9.6-slim-buster"
+ARG PYTHON_VERSION="3.8.12-slim-buster"
 FROM python:${PYTHON_VERSION}
 
 RUN apt-get update \
diff --git a/backend/Dockerfile.prod b/backend/Dockerfile.prod
index 35c239ed..0d27c417 100644
--- a/backend/Dockerfile.prod
+++ b/backend/Dockerfile.prod
@@ -1,4 +1,4 @@
-ARG PYTHON_VERSION="3.9.6-slim-buster"
+ARG PYTHON_VERSION="3.8.12-slim-buster"
 FROM python:${PYTHON_VERSION}
 
 CMD ["python3"]
diff --git a/backend/api/models.py b/backend/api/models.py
index c367ebf1..824d2953 100644
--- a/backend/api/models.py
+++ b/backend/api/models.py
@@ -1,8 +1,6 @@
 import string
 from typing import Literal
 
-from django import db
-
 from auto_labeling_pipeline.models import RequestModelFactory
 from django.contrib.auth.models import User
 from django.core.exceptions import ValidationError
diff --git a/backend/api/tasks.py b/backend/api/tasks.py
index 980c0b5b..a44f3c5a 100644
--- a/backend/api/tasks.py
+++ b/backend/api/tasks.py
@@ -1,6 +1,6 @@
 import itertools
 
-from celery import shared_task 
+from celery import shared_task
 from celery.utils.log import get_task_logger
 from django.conf import settings
 from django.contrib.auth import get_user_model
@@ -15,6 +15,8 @@ from .views.upload.factory import (get_data_class, get_dataset_class,
 from .views.upload.utils import append_field
 
 logger = get_task_logger(__name__)
+
+
 class Buffer:
 
     def __init__(self, buffer_size=settings.IMPORT_BATCH_SIZE):
diff --git a/backend/api/views/label.py b/backend/api/views/label.py
index dea5ac00..504b2bd0 100644
--- a/backend/api/views/label.py
+++ b/backend/api/views/label.py
@@ -15,12 +15,14 @@ from ..models import Label, Project
 from ..permissions import IsInProjectReadOnlyOrAdmin, IsProjectAdmin
 from ..serializers import LabelSerializer
 
+
 def camel_to_snake(name):
-  name = re.sub('(.)([A-Z][a-z]+)', r'\1_\2', name)
-  return re.sub('([a-z0-9])([A-Z])', r'\1_\2', name).lower()
+    name = re.sub('(.)([A-Z][a-z]+)', r'\1_\2', name)
+    return re.sub('([a-z0-9])([A-Z])', r'\1_\2', name).lower()
+
 
 def camel_to_snake_dict(d):
-   return {camel_to_snake(k): v for k,v in d.items()}
+    return {camel_to_snake(k): v for k, v in d.items()}
 
 
 class LabelList(generics.ListCreateAPIView):