---
'@backstage/frontend-plugin-api': minor
'@backstage/core-plugin-api': minor
---

**BREAKING PRODUCERS**: The `IconComponent` no longer accepts `fontSize="default"`. This has effectively been removed from Material-UI since its last two major versions, and has not worked properly for them in a long time.

This change should not have an effect on neither users of MUI4 nor MUI5/6, since the updated interface should still let you send the respective `SvgIcon` types into interfaces where relevant (e.g. as app icons).