update to 5.6.1 not available

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I 've got several websites running Concrete5 and try to keep them up-to-date as much as possible. One of the servers is running two sites. One of them is running from the root, the other one resides in a subdomain.
I was able to update the site running in the subdomain from 5.6.0.2 to 5.6.1 without any problems. The other site, also running 5.6.0.2 gives me a message that there are no updates available (see attached screenshot). Can anyone tell me how to fix this?

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