Determining a next time to communicate via a network with a source of updates is disclosed. In some embodiments, determining a next time to communicate via a network with a source of updates comprises receiving from a request source an update request, and scheduling a next time for the request source to check for updates. In some embodiments, determining a next time to communicate via a network with a source of updates comprises monitoring network communication activity, and in the event anomalous network communication activity is observed, reducing a time remaining until a next check for updates is performed.