Despite this, almost every OMEMO implementation I can find is still on version 0.3.0 (or earlier) of the OMEMO specification. If I find a problem in the older draft of the specification, some will insist that those are known problems with an older version of the spec, and that people “should” be on the newer version if they expect to be secure. The latest version of Conversations depends on version 1.64 of the Bouncy Castle S/MIME implementation (October 2019), despite 1.70 being the latest that supports Java 1.5 (and 1.78 being the latest overall, but requires Java 1.8).