# Migrate from 0.2 to 0.3

> Move a project from the 0.2 to the 0.3 — what changes on its own, and what to turn on.

A project on the 0.2 builds with the 0.3 as it is: every new field is optional.

## Update

```bash
npm install docpensieve@latest
```

Through `npx` alone, `npx docpensieve` fetches the 0.3 by itself. Going back is
`npm install docpensieve@0.2.0`.

## What changes on its own

| What                                       | In 0.3                                          |
| ------------------------------------------ | ----------------------------------------------- |
| Pages with `authors`, `date` or `modified` | Open with a byline naming the authors and dates |

Nothing to change, but something to know: those three fields already existed,
read by the sitemap and the page data without ever being shown. They are now
shown, so a page that carries them gains a block it did not have. A page that
carries none of them looks exactly as before.

`tags` follows the same path: read until now only by the page data, it now
shows at the bottom of every page that carries it.

One constraint is gone, too. A `sidebar` or `authors` file named in the
configuration no longer has to exist in every version folder: a version
without it keeps the menu of its folders, or shows the names alone.

On a narrow screen, the header changes for every site: the version switcher and
the search field move behind a menu button. Nothing to configure — `headerLinks`
only adds links to that menu.

## What to turn on

| Field                        | Gives                                                 |
| ---------------------------- | ----------------------------------------------------- |
| `authors: 'authors.json'`    | Biographies, avatars and links, described per version |
| `<Cards />` in an index page | A grid of cards built from the pages of the folder    |

Both are described where they are used: authors and dates in
[Writing pages](/versions/v0.3/guide/writing-pages/), the grid in [Cards](/versions/v0.3/components/cards/).