iOS updates since iOS 17.

Breaking this down:

iPadOS 17 Major Version release September 2023

Major versions are released annually. For iOS/iPadOS, these are typically released in September of a Calendar year.

After a major version release, it is not unexpected to see a number of rapid minor-point releases - these resolving issues that will be identified by users across a wide range of device models. While Apple's internal and third-party beta testing is reportedly thorough, it cannot possibly hope to regression test against every device model and replicate everyday usage by millions of end-users.

iPadOS 17.x Feature Releases

Feature releases introduce new functionality throughout the major version lifecycle. To date, for iPadOS 17, there have been four feature releases.

• 17.1 October 23
• 17.2 December 23
• 17.3 January 24
• 14.4 March 24

Each feature release may require a minor-point release to resolve minor issues.

Security Updates

Minor-point releases typically include essential security updates to address emerging security threats or identified security vulnerabilities. Minor-point updates may also include minor functional fixes.

It is perhaps far better to have actively maintained system software that addresses both identified functional issues and security vulnerabilities - in preference to the alternative approach of neglect or inability to respond to emerging threats.

If you are managing a large estate, you might be best advised to consider an appropriate central management solution - consisting of Apple Business Manager (ABM) and a commercial Mobile Device Management (MDM) platform.

Almost all updates have been security related.

Did you already have a look at this Apple Security Releases page, to find out what has been fixed?

Apple security releases - Apple Support

Please update on iPad mini 13g36 IOS 9.3.5