For now EPEL-7 have ownCloud 8.2

As upstream only support update from 1 version, you need to update first to 8.2 (in "remi" or in EPEL) and then to 9.0 (in "remi-test")

This is a backport from Fedora package, Thanks to James Hogarth.

You can use this version enabling remi-test temporarily or by using the "includepkgs=owncloud* php-symfony* php-sabre*" directive

Of course, I also recommends to update PHP to 5.6 by enabling remi-php56 repository.

P.S. I plan to move this version to remi in a few days