diff --git a/.changeset/short-rockets-remain.md b/.changeset/short-rockets-remain.md
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+---
+'@backstage/app-defaults': patch
+'@backstage/core-app-api': patch
+'@backstage/core-plugin-api': patch
+---
+
+- Remove deprecation configuration option `theme` from `AppTheme` of the `AppThemeApi`
+- Removed reference to `theme` in the `app-defaults` default `AppTheme`
+- Removed logic in `AppThemeProvider` that creates `ThemeProvider` from `appTheme.theme`