Hot on the heels of other updates this week, Apple has released its first update to iBooks for OS X. Given that this is a rather quick release and that the release notes only say "This version of iBooks includes bug fixes and improvements to performance and stability," users shouldn't expect to notice any radical changes off the bat. Hopefully Apple has fixed some of the bugs that plagued iBooks since launching on OS X, including users missing ebooks from their library that were obtained from third-party ebook stores.