Changed in this version fix(types): prevent prop bleed on styling properties (fixes #4053, c0f8015) feat(types): ship csstype via "CSS" namespace (e6c4f0a) chore: bump stylis to 4.3 (fixes #4007, fa58875) reduced some sources of unnecessary branching logic Breaking changes in v6 Migration guide → https://styled-components.com/docs/faqs#what-do-i-need-to-do-to-migrate-to-v6 now using stylis v4 (if