Riot wants to update, but there is no new version

Riot tells me:

A new version of Riot is available.

but there is no new version available, i am on 0.16.3, which is the latest release while writing.

I am on OSX desktop with riot

You can see the window that RIOT inserts from time to time, when i press the update button it just closes the application.

I have a firewall in place, so there is the possibility that riot is blocked from communicating with the update server, but this is just a guess.

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