Release notes (part of the migration guide): <a href="https://www.openssl.org/docs/man3.0/man7/migration_guide.html" rel="nofollow">https://www.openssl.org/docs/man3.0/man7/migration_guide.htm...</a><p>Not too many breaking changes per-se, but lots of old API calls deprecated (pretty much all the old low-level APIs), plus new default values for a variety of things.<p>Also, going forward they'll be using the standard semantic version-numbering system.