Thanks. Our plugin relies on omniauth-vkontakte, and I can see they made this change recently as well: Replace vk.com with vk.ru (#92) · mamantoha/omniauth-vkontakte@98cf241 · GitHub
In order for the plugin to actually switch from vk.com to vk.ru, the plugin also needs to update the version of omniauth-vkontakto to include that commit, i.e. to be on version 1.9.0. I added this to your PR, but in practice, I don’t have any active sites running authentication via VK. Do you have one? Can you test the gem upgrade to see if it causes any issues?