The free updated software is now available from the App Store. Version 5.0 of the official Twitter client is a 9.4-megabyte download that requires iOS 5.0 or later.
Twitter's updated iOS application also adds photo streams on profiles and events. The social networking site said the application also has "other improvements, polish, and fixes."
Built-in Twitter integration was one of the hallmark features of iOS 5, which was released last year. The site saw signups from iOS users triple after the launch of iOS 5.