---
minor_changes:
- "The acme_account and acme_certificate modules now support two backends:
   the Python cryptograpy module or the OpenSSL binary. By default, the
   modules detect if a new enough cryptography module is available and
   use it, with the OpenSSL binary being a fallback. If the detection
   fails for some reason, the OpenSSL binary backend can be explicitly
   selected by setting select_crypto_backend to openssl."