Styled components dict was renamed to Themed to avoid confusion with styled components constructors from @emotion/styled and similar libraries.
theme.useRootStyles configuration option (false by default). Set it to true to add styles.root to html instead of body.
- theme.useBodyStyles configuration option still defaults to true, but it's going in to be deprecated in favor of theme.useRootStyles in the future.
New scale: transitions supporting transition CSS property. Issue #1079, PR #1272
Objects in nested scales can now have a __default key. PR #951

Given the theme
```
const theme = {
  colors: {
    primary: {
      __default: '#00f',
      light: '#33f',
    }
  }
}
```
color: 'primary' resolves to color: '#00f'.
Configuration option for printing color mode. PR #1267, issue #1144. No more wasted ink.
```
{
  initialColorModeName: "dark",
  printColorModeName: "light"
}
```
A new component, Paragraph was added in PR #1298

Theme UI 0.6 depends on Emotion 11, and isn't compatible with Emotion 10 anymore.
- If you didn't install Emotion separately, this update shouldn't affect you.
- If your other dependencies depend on Emotion 10, and have no published versions for Emotion 11, you can use Yarn resolutions or Webpack's resolve.alias to enforce a version.
Refer to Emotion 11 release notes for more information.
Color mode flash on first render is gone, but to achieve this we had to bring back theme.rawColors.
- You can no longer read raw color values from theme.colors when reading theme from useThemeUI or inside sx.
- .colors object contains Custom CSS Properties now.
- If you need to pass original value somewhere where CSS Properties (e.g. WebGL Canvas) won't work use .rawColors.
Default color mode name is no longer "default" — it's now undefined, what represents the lack of color mode set by user or detected from preferences.
useColorSchemeMediaQuery defaults to true. Issue #624, PR #1373

How to migrate? Add useColorSchemeMediaQuery: false to your theme if you don't have this property. Read more in the docs.
We no longer export internal React context named as Context 😅 It wasn't and it's still not public API, but if you used it and you really need it, you can grab it as __ThemeUIContext. (But please don't do this. Use ThemeProvider from @theme-ui/core for local theme overrides instead.)