exiv2-libs not backwards compatible

Hi!

I have a third-party RPM installed which is linked against libexiv2 (exiv2-libs). When trying to do a yum upgrade towards the 7.5 package set, I am greeted with the following error:

--> Finished Dependency Resolution
Error: Package: *witheld* (installed)
           Requires: libexiv2.so.12()(64bit)
           Removing: exiv2-libs-0.23-6.el7.x86_64 (@rhel-7-server-rpms)
               libexiv2.so.12()(64bit)
           Updated By: exiv2-libs-0.26-3.el7.x86_64 (rhel-7-server-rpms)
              ~libexiv2.so.26()(64bit)
Error: Package: gnome-classic-session-3.26.2-3.el7.noarch (rhel-7-server-rpms)
           Requires: gnome-shell-extension-top-icons = 3.26.2-3.el7

It seems that the new package version overwrites the old so file, instead of including a backwards compatible version. How do I fix this? I thought common practice was to create a new libs package whenever the so file version changed, to allow old software to be installed (and updated eventually)?