The naming scheme of releases that are published on Maven are like
Here 17 means 2017 and 4 means April.
The next release which will be publish in Maven be like
again, 17 means 2017 and 8 means August.
But the version we provided you on this forum is actually a hot fix. Hot Fix has 3 digits and are not published via Maven.
Hot Fixes provided in April would be like this
and Hot Fixes provided in June would be like this
In short, actual releases are provided once per month and has two digits. While hot fixes are provided throughout the month and has 3 digits.
Actual releases are provided via Maven but Hot Fixes are provided via Forums.
The next actual release i.e. 17.8 will be available on 18-Aug-2017 and it will available via Maven. So, until then, you will have to download the Hot Fix via forums and use in your project or wait for actual release till 18-Aug-2017.