I've just uploaded Smack 4.1.8 and 4.2.0-beta2 to Maven Central.
Smack 4.1.8 fixes a few minor issues and is expected to be the last release of the 4.1 branch. As always, Smack releases with the same major and minor version numbers are drop in replacements. Ideally you just need to change a single variable somewhere in your build system.
Smack 4.2.0-beta2 is the latest beta of Smack's current development branch. Notable additions include support for XEP-0313: Message Archive Management (MAM) and the IoT XEP series.