Has Apple ever updated a core iOS app outside the context of an iOS update?

Hey folks, as the subject line asks, I'm wondering if Apple has ever rolled out updates to a 'built-in' ios app (e.g., Weather. Stocks, Maps, Music, etc.) in a manner that was not accompanied by a related iOS update.

I suspect that they _can_, I'm simply trying to determine whether they _have_in a manner that might have been detectable to users. Which app? When?

If this is a very common occurrence on iOS let me know.