Cannot use with the following web site

On both my iPhone and iPad I cannot use the following website since the last update. Before that I was able to access the site: http://tass.brookhouse.ac.ke. It is the school management system we use and I was using just fine before. Now I get a message that says I have an incompatible software version.

Eshabouk about Google Chrome – The Fast and Secure Web Browser, v59.0.3071.