Overview

Celery 5.3, released on June 7, 2023, improves the canvas system and adds Django 4.2 support.

Main Features

Canvas improvements

The canvas system (chains, groups, chords) benefits from reliability fixes and better error handling in complex workflows.

python 
from celery import Celery, chain, group

app = Celery('tasks', broker='redis://localhost')

@app.task
def add(x, y):
    return x + y

@app.task
def multiply(x, y):
    return x * y

# Canvas: task chain
workflow = chain(
    add.s(4, 4),
    multiply.s(2),
)
result = workflow.apply_async()

Django 4.2 support

Celery 5.3 is fully compatible with Django 4.2, supporting new ORM features and the improved Redis cache backend.

python 
# settings.py (Django)
# CELERY_BROKER_URL = 'redis://localhost:6379/0'
# CELERY_RESULT_BACKEND = 'django-db'

from celery import shared_task

@shared_task
def send_notification_email(recipient, subject):
    # Async task in Django
    from django.core.mail import send_mail
    send_mail(subject, 'Content', 'from@ex.com', [recipient])
    return f'Email sent to {recipient}'

Sources