WordPress Core files modified

under updates, WordPress tells me “Hey! One or more of your WordPress core files or directories have been modified. This could mean that your site has been hacked! ” but when I try to “Reset Core Files” using the button provided, i get the following red error message:

Uh oh! Downloading WordPress 4.7 (en_US)… Warning: cURL error 77: error setting certificate verify locations: CAfile: /tmp/wp-cli-cacert.pem CApath: none Warning: cURL error 77: error setting certificate verify locations: CAfile: /tmp/wp-cli-cacert.pem CApath: none Error: md5 hash for download (d41d8cd98f00b204e9800998ecf8427e) is different than the release hash (474c022ef8e5371a8fc756dbfeb96d1b).