Xcode 26 - Flutter 3.38 - Flutter 3.29

According to Apple’s requirement, starting from April 2026, when submitting apps to the App Store, they must be built using Xcode 26.

Starting April 2026, apps and games uploaded to App Store Connect need to meet the following minimum requirements:

• iOS and iPadOS apps must be built with the iOS 26 & iPadOS 26 SDK or later
• tvOS apps must be built with the tvOS 26 SDK or later
• visionOS apps must be built with the visionOS 26 SDK or later
• watchOS apps must be built with the watchOS 26 SDK or later

According to the Flutter documentation, Flutter 3.38 fully supports iOS 26, Xcode 26, and macOS 26.

Therefore, if our application continues to use Flutter version 3.29.3 and is built with Xcode 26, what specific features or aspects would not be supported? 
Would this potentially lead to rejection by Apple?

Please note that we have tested our application in the development environment using Xcode 26 and Flutter 3.29.3, and it can still be built successfully, run normally, and generate the .ipa archive without issues.

We would greatly appreciate your earliest response. Thank you very much.

Contact email: chau.tran@monstar-lab.com