The release numbers are not consecutive because not every beta release is voted for wider release. This one has.
The latest beta preview release of Tapestry 5.4 is now available.
Tapestry 5.4-beta-6 contains a significant number of bug fixes and minor improvements. Dependencies on third party libraries have been updated.
This release is available from the Maven Central Repository, or as a direct download.
While not an actual release candidate, beta previews like this one are high-quality builds that pass all of Tapestry's extensive automated tests and have been voted on by the Tapestry team.
You are encouraged to try out this beta preview and let us know how it's working.