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## Appendix F. Migrating from Cowboy 2.11 to 2.12

Cowboy 2.12 contains a small security improvement for the HTTP/2 protocol.

Cowboy 2.12 requires Erlang/OTP 24.0 or greater.

## F.1. Features added

- A new HTTP/2 option `max_fragmented_header_block_size` has been added to limit the size of header blocks that are sent over multiple HEADERS and CONTINUATION frames.
- Update Cowlib to 2.13.0.

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