As of 28 July 2017, the bleeding edge "Fresh" version of LibreOffice v.5.4.0 is available for download. The "Fresh" version of LibreOffice is for those of you who are looking for some of the newest options and not-as-of-yet solid implemented in the suite; there may be the risk of a little bit of instability for some of these newest options, but you can help debug some of these instabilities and take part in helping improve their implementations. ...
Even thought the "Fresh" version is still considered quite stable, If you are looking for a little more rock-solid stability, the "Still" version is available for download.
More information of LibreOffice 5.4.0 may be found here: https://blog.documentfoundation.org/blog/2017/07/28/libreoffice-5-4/