diff --git a/CHANGELOG.md b/CHANGELOG.md
index d99be71e..feffc1ba 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -2,6 +2,22 @@
 
 Inspired from [Keep a Changelog](https://keepachangelog.com/en/1.0.0/)
 
+## [Unreleased]
+
+### Added
+
+### Changed
+
+### Deprecated
+
+### Removed
+
+### Fixed
+
+### Security
+
+### Dependencies
+
 ## [4.2.0]
 
 ### Dependencies
@@ -253,6 +269,7 @@ Inspired from [Keep a Changelog](https://keepachangelog.com/en/1.0.0/)
 - Bumps `github.com/stretchr/testify` from 1.8.0 to 1.8.1
 - Bumps `github.com/aws/aws-sdk-go` from 1.44.45 to 1.44.132
 
+[Unreleased]: https://github.com/opensearch-project/opensearch-go/compare/v4.2.0...HEAD
 [4.2.0]: https://github.com/opensearch-project/opensearch-go/compare/v4.1.0...v4.2.0
 [4.1.0]: https://github.com/opensearch-project/opensearch-go/compare/v4.0.0...v4.1.0
 [4.0.0]: https://github.com/opensearch-project/opensearch-go/compare/v3.1.0...v4.0.0
diff --git a/internal/version/version.go b/internal/version/version.go
index f7759e4c..ecdeb2a3 100644
--- a/internal/version/version.go
+++ b/internal/version/version.go
@@ -27,4 +27,4 @@
 package version
 
 // Client returns the client version as a string.
-const Client = "4.2.0"
+const Client = "4.2.1"