# iOS SDK changelog

> Track versioned releases and updates for the Unity Ads iOS SDK.

## Version 4.21.0 - released 2026-10-01

* Improved SDK initialization, ad loading, and bidding token performance.
* Fixed bugs and added stability improvements.

## Version 4.20.1 - released 2026-09-14

* SDK size optimization.

## Version 4.20.0 - released 2026-08-14

* Improved ad load reliability and overall performance.
* Fixed a crash when presenting the App Store product sheet while the product sheet is open from previous ad cycle, and other stability fixes.

## Version 4.19.0 - released 2026-06-23

* Fixed bugs and added stability improvements.

> **Important:**
>
> Direct integration publishers: Refer to the latest iOS API reference for [Swift](/ads-ios/4.21.0/sdk-integration/api/ios-api-swift.md) and [Objective-C](/ads-ios/4.21.0/sdk-integration/api/ios-api-objc.md) for APIs deprecated since Unity Ads SDK 4.19.0.