diff --git a/CHANGELOG.md b/CHANGELOG.md
index 348a4843a2..592c349bd6 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -36,6 +36,17 @@ Ref: https://keepachangelog.com/en/1.0.0/
 
 ## [Unreleased]
 
+## [v4.2.1] - 2021-04-08
+
+A critical security vulnerability was identified in Tendermint Core, which impacts Tendermint Lite Client.
+
+This release fixes the identified security vulnerability.
+
+### Bug Fixes
+
+* (sdk)  Bump SDK version to [v0.42.4](https://github.com/cosmos/cosmos-sdk/releases/tag/v0.42.4)
+* (tendermint) Bump Tendermint version to [v0.34.9](https://github.com/tendermint/tendermint/releases/tag/v0.34.9).
+
 ## [v4.2.0] - 2021-03-25
 
 A critical security vulnerability has been identified in Gaia v4.1.x.
@@ -321,7 +332,8 @@ See the [Tendermint v0.34.7 SDK changelog](https://github.com/tendermint/tenderm
 
 <!-- Release links -->
 
-[Unreleased]: https://github.com/cosmos/gaia/compare/v4.2.0...HEAD
+[Unreleased]: https://github.com/cosmos/gaia/compare/v4.2.1...HEAD
+[v4.2.1]: https://github.com/cosmos/gaia/releases/tag/v4.2.1
 [v4.2.0]: https://github.com/cosmos/gaia/releases/tag/v4.2.0
 [v4.1.2]: https://github.com/cosmos/gaia/releases/tag/v4.1.2
 [v4.1.1]: https://github.com/cosmos/gaia/releases/tag/v4.1.1