Overview
Uvicorn 0.36, released on September 20, 2025, adds support for a custom event loop (IOLOOP).
Main Features
Custom IOLOOP
It is now possible to specify a custom event loop via the --loop parameter, allowing the use of uvloop, asyncio, or any compatible implementation.
python
# Use with uvloop
# uvicorn app:app --loop uvloop
# Use with standard asyncio
# uvicorn app:app --loop asyncio
# Configuration via code
import uvicorn
uvicorn.run('app:app', loop='uvloop', port=8000)