Update required to sync ical to iphone?

I have not updated my MacBook to iOS x.iTunes used to be able to sync my iCal calendars to my iPhone. With the latest version of iTunes, it seems as though the sync happens between calendars on my phone and iCloud -- not iCal. Is it necessary to upgrade now to allow the sync?

Yes you need the update and you also need the new version of itunes released on 16th December: 11.0.1

Version 11 was released early December but had severe issues hence a further update on the 16th.
you can download it here if you do not have it:

http://www.apple.com/.../download/

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