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## 4.15.1
> Note: This is a security release for Cloud Firestore on iOS and macOS. Firebase iOS SDK 12.19.3 removes compromised eMudhra CA roots from Firestore's embedded gRPC root-certificate bundle ([firebase-ios-sdk#16930](firebase/firebase-ios-sdk#16930)). CocoaPods and Swift Package Manager both now use 12.19.3.
>
> - **Swift Package Manager**: upgrade to this `firebase_core` release.
> - **CocoaPods**: upgrade to this release, or patch immediately by adding `$FirebaseSDKVersion = '12.19.3'` at the top of `ios/Podfile` and running `pod update FirebaseFirestore`. If you also use `firebase_analytics` or `firebase_app_check`, upgrade them as well: older versions require `FirebaseAnalytics`/`FirebaseAppCheck` 12.19.3, which was not published.
> - **Windows**: the Firebase C++ SDK is also affected and will be fixed in a follow-up `firebase_core` release.
- **FIX**(core): bump Firebase iOS SDK to 12.19.3 (4.x backport, Firestore security fix) ([#18861](#18861)). ([ff334ac](ff334ac))