Thank you for pointing that out, we already knew about the new ntopng release but we decided to not upgrade the NS package.
The upstream project releases an RPM which requires many compilation dependencies like gcc. We think this is not a good idea and almost useless in most scenarios.
Last year, after months of work with the upstream project, we got a good RPM build without such dependencies. But with the new release, bad dependencies are back.
We are going to support the current ntopng version for all the NS 7 lifecycle, but the package will not be updated.