Don’t use the update now button, use a full on download of the core WP – http://wordpress.org/download/ – and then make sure you flush any cache you’ve got running. Do you have memcached or APC or xcache? Purge that. Plugins ditto.
I saw that on one of my sites where my server’s object cache hung on to things. I went and checked the readme.html and verified I WAS on the right version, so I knew it had to be cached somewhere.
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