diff --git a/release_build_files/readme.md b/release_build_files/readme.md
index dd0dca004..9c7cdfe44 100644
--- a/release_build_files/readme.md
+++ b/release_build_files/readme.md
@@ -631,8 +631,10 @@ workflow use only during the development of your app, not for publicly shipping
 code.
 
 ## Release Notes
-### Upcoming Release
+### 12.1.0
 -   Changes
+    - General (Android): Update to Firebase Android BoM version 33.1.1.
+    - General (iOS): Update to Firebase Cocoapods version 10.28.1.
     - Analytics (iOS): Add support for
       `InitiateOnDeviceConversionMeasurementWithHashedEmailAddress` and
       `InitiateOnDeviceConversionMeasurementWithHashedPhoneNumber`.