Can’t Access My Dashboard

Hi there,

I just uploaded the most recent version of WordPress (4.7.5). I’m not able to get into my dashboard and make edits to the website. Instead, the following address came up: https://www.mamft.org/wp-admin/upgrade.php?_wp_http_referer=%2Fwp-admin%2F

Could someone help me understand what this means, and how to fix this so that I can get access to my dashboard? Thanks.