Updating to Newest WordPress 4.1.2

i am getting this error message when trying to update to WordPress 4.1.2

Update WordPress
Downloading update from https://downloads.wordpress.org/release/wordpress-4.1.2-no-content.zip…

Unpacking the update…

Warning: copy(/home2/rftm/public_html/wp-admin/includes/update-core.php): failed to open stream: Permission denied in /home2/rftm/public_html/wp-admin/includes/class-wp-filesystem-direct.php on line 231

The update cannot be installed because we will be unable to copy some files. This is usually due to inconsistent file permissions.: wp-admin/includes/update-core.php

Installation Failed

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What should I do?

Thank you all for your support in advance!

-Jeff