FastAPI 0.110.3 "extra" dependencies are now in default dependencies for 0.111.0

[ff137]

First Check

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Example Code

To investigate, run poetry lock on the following pyproject.toml files:

[tool.poetry]
name = "test"
version = "0.1.0"
description = "test"
authors = ["test"]

[tool.poetry.dependencies]
python = "^3.12"
fastapi = { version = "0.110.3", extras = [] }

$ poetry lock

Then change fastapi version to 0.111.0:

[tool.poetry.dependencies]
fastapi = { version = "0.111.0", extras = [] }

$ poetry lock

The former (v0.110.3) has a much simpler dependency tree, and (notably, for our requirement) does not include uvloop.

The latter (v0.111.0) has significantly more dependencies included by default.

Compare the results in the lock files:

0.110.3:

[[package]]
name = "fastapi"
version = "0.110.3"
description = "FastAPI framework, high performance, easy to learn, fast to code, ready for production"
optional = false
python-versions = ">=3.8"
files = [...]

[package.dependencies]
pydantic = ">=1.7.4,<1.8 || >1.8,<1.8.1 || >1.8.1,<2.0.0 || >2.0.0,<2.0.1 || >2.0.1,<2.1.0 || >2.1.0,<3.0.0"
starlette = ">=0.37.2,<0.38.0"
typing-extensions = ">=4.8.0"

[package.extras]
all = ["email_validator (>=2.0.0)", "httpx (>=0.23.0)", "itsdangerous (>=1.1.0)", "jinja2 (>=2.11.2)", "orjson (>=3.2.1)", "pydantic-extra-types (>=2.0.0)", "pydantic-settings (>=2.0.0)", "python-multipart (>=0.0.7)", "pyyaml (>=5.3.1)", "ujson (>=4.0.1,!=4.0.2,!=4.1.0,!=4.2.0,!=4.3.0,!=5.0.0,!=5.1.0)", "uvicorn[standard] (>=0.12.0)"]

vs

0.111.0:

[[package]]
name = "fastapi"
version = "0.111.0"
description = "FastAPI framework, high performance, easy to learn, fast to code, ready for production"
optional = false
python-versions = ">=3.8"
files = [...]

[package.dependencies]
email_validator = ">=2.0.0"
fastapi-cli = ">=0.0.2"
httpx = ">=0.23.0"
jinja2 = ">=2.11.2"
orjson = ">=3.2.1"
pydantic = ">=1.7.4,<1.8 || >1.8,<1.8.1 || >1.8.1,<2.0.0 || >2.0.0,<2.0.1 || >2.0.1,<2.1.0 || >2.1.0,<3.0.0"
python-multipart = ">=0.0.7"
starlette = ">=0.37.2,<0.38.0"
typing-extensions = ">=4.8.0"
ujson = ">=4.0.1,<4.0.2 || >4.0.2,<4.1.0 || >4.1.0,<4.2.0 || >4.2.0,<4.3.0 || >4.3.0,<5.0.0 || >5.0.0,<5.1.0 || >5.1.0"
uvicorn = {version = ">=0.12.0", extras = ["standard"]}

Description

As far as I can tell from the fastapi pyproject.toml, uvicorn[standard] is an optional dependency, I've looked at the comparison between 0.110.3 and 0.111.0 (^) and the only difference is that a standard group was defined under [project.optional-dependencies]. However, I do not understand why this would require all these extra dependencies by default? Especially with the extras = [] flag, I would expect the optional dependencies to not be included ...

This is a breaking change for us, as we have a dependency on nest_asyncio, which is not compatible with uvloop.

Operating System

Linux

Operating System Details

No response

FastAPI Version

0.111.0

Pydantic Version

2.7.1

Python Version

3.12.3

Additional Context

No response

[ff137]

I've resolved my own question ... fastapi-slim is the new alternative. I promise I did look for alternatives answers, but of course I only see it after posting 😂