CHANGELOG.md in aws-sdk-backup-1.56.0 vs CHANGELOG.md in aws-sdk-backup-1.57.0

@@ -1,7 +1,12 @@
 Unreleased Changes
 ------------------
 
+1.57.0 (2023-08-08)
+------------------
+
+* Feature - This release introduces a new logically air-gapped vault (Preview) in AWS Backup that stores immutable backup copies, which are locked by default and isolated with encryption using AWS owned keys. Logically air-gapped vault (Preview) allows secure recovery of application data across accounts.
+
 1.56.0 (2023-07-11)
 ------------------
 
 * Feature - Code Generated Changes, see `./build_tools` or `aws-sdk-core`'s CHANGELOG.md for details.