v5.0.0

bitfinex-api-py v5.0.0

Breaking Changes

• Minimum Python version is now 3.10 (was 3.8)
• pyee upgraded from 11.x to 13.x — if you subclass BfxEventEmitter or use pyee internals, review pyee changelog
• websockets upgraded from 12.x to 16.x — if you access the underlying websocket connection directly, the API has changed (WebSocketClientProtocol → ClientConnection)

What's New

• Modern build system: migrated from setup.py (distutils) to pyproject.toml (hatchling/PEP 621)
• Modern type hints: all Optional[X] → X | None, List → list, Dict → dict, Union → |
• Ruff: replaced black + isort + flake8 with ruff for linting and formatting
• Test suite: 171 unit tests covering serializers, handlers, middleware, connection logic, and utilities
• CI/CD: pytest runs across Python 3.10, 3.11, 3.12, 3.13

Dependencies

Package	Old	New
Python	>=3.8	>=3.10
pyee	~=11.1.0	~=13.0
websockets	~=12.0	~=16.0
requests	~=2.32.3	~=2.32.3

Public API

No changes to the public API surface. All method signatures, classes, and exported types remain identical. This is a drop-in upgrade if you are on Python >=3.10.