CHANGELOG.md in aws-sdk-docdb-1.55.0 vs CHANGELOG.md in aws-sdk-docdb-1.56.0

@@ -1,7 +1,12 @@
 Unreleased Changes
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+1.56.0 (2023-11-20)
+------------------
+
+* Feature - Amazon DocumentDB updates for new cluster storage configuration: Amazon DocumentDB I/O-Optimized.
+
 1.55.0 (2023-11-06)
 ------------------
 
 * Feature - Update the input of CreateDBInstance and ModifyDBInstance to support setting CA Certificates. Update the output of DescribeDBInstance and DescribeDBEngineVersions to show current and supported CA certificates.