**On a ARM64 machine running Windows 11, in WSL2 running Ubuntu-24.04 (4-May-2026):**
``` zsh
> pixi init
> pixi add python python-fasthtml
> pixi shell
> python app.py
Traceback (most recent call last):
File "/home/fizzix/repos/sandbox/fasthtml/app.py", line 3, in
app = FastHTML()
File "/home/fizzix/repos/sandbox/fasthtml/.pixi/envs/default/lib/python3.14/site-packages/fasthtml/core.py", line 536, in __init__
super().__init__(debug, routes, middleware=middleware, exception_handlers=excs, on_startup=on_startup, on_shutdown=on_shutdown, lifespan=lifespan)
~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
TypeError: Starlette.__init__() got an unexpected keyword argument 'on_startup'
```

```python
# Contents of app.py:
from fasthtml.common import FastHTML, serve

app = FastHTML()

@app.get("/")
def home():
return "

Hello, World

serve()
```

**Expected behavior**
Server launches; demo app available on localhost.

**Environment Information**
``` zsh
> print(fastlite.__version__)
0.0.13
> print(fastcore.__version__)
1.12.44
> print(fasthtml.__version__)
0.9.1
```

**Confirmation**
Please confirm the following:
- [x] I have read the FAQ (https://docs.fastht.ml/explains/faq.html)
- [x] I have provided a minimal reproducible example
- [x] I have included the versions of fastlite, fastcore, and fasthtml
- [x] I understand that this is a volunteer open source project with no commercial support.

**Additional context**
I prefer to use pixi instead of pip for project environment management. I figured that was within scope given it's well-suited for managing AI libraries,