Drupal - Drush does not acknowledge release of new core update

drush rf will refresh the available releases and at that point you should be able to run drush up or drush up drupal.

I have the same problem. Can't get to update list of modules and core. Tried CC, cache_update truncate. Well everything I could come up with and still nothing. What is strange is that on localhost is where I get this, on remote server it is ok.

So I fixed it somehow with disabling and uninstaling update manager and installing it again.

In addition to all the great answers above, be sure to do a double check for possible [facepalm] brain-fail issues:

• are you logged in to the right server?
• the right drupal site path on that server?
• did you mess with your /etc/hosts file and forget?
• is www and non-www pointed to the same place?
• are you looking at a local or dev copy in your browser?

If you run drush status and it has the updated version but you still see the update alerts in the GUI Reports > Available Updates page then you might be a total f#¢&ing idiot like me and be looking at different copies of the site.

If you've already tried drush rf and you compare drush status and it has the same current version number you get when you run drush pm-releases drupal then you definitely have an issue other than drush not working properly.