## Before Upgrading

Consider the following changes, limitations, and guidelines before you upgrade:

### **API Machinery**

* `@app.patch()`
* `@app.trace()`

/// tip

You are free to use each operation (HTTP method) as you wish.

**FastAPI** doesn't enforce any specific meaning.

The information here is presented as a guideline, not a requirement.

For example, when using GraphQL you normally perform all the actions using only `POST` operations.

///

</div>

## Create a Virtual Environment { #create-a-virtual-environment }

When you start working on a Python project **for the first time**, create a virtual environment **<abbr title="there are other options, this is a simple guideline">inside your project</abbr>**.

/// tip

You only need to do this **once per project**, not every time you work.

///

//// tab | `venv`

* ✏️ Fix typos in OAuth2 password request forms. PR [#14112](https://github.com/fastapi/fastapi/pull/14112) by [@alv2017](https://github.com/alv2017).
* 📝 Update contributing guidelines for installing requirements. PR [#14095](https://github.com/fastapi/fastapi/pull/14095) by [@alejsdev](https://github.com/alejsdev).

### Translations

- Replaced *_admission_latencies_milliseconds_summary and *_admission_latencies_milliseconds metrics because they were reporting seconds rather than milliseconds. They were also subject to multiple naming guideline violations (units should be in base units and "duration" is the best practice labelling to measure the time a request takes). Please convert to use *_admission_duration_seconds and *_admission_duration_seconds_summary, as these now report the unit...