diff --git a/CHANGELOG.md b/CHANGELOG.md
index 5a46df2106..0fd559457b 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -36,6 +36,14 @@ Ref: https://keepachangelog.com/en/1.0.0/
 
 ## [Unreleased]
 
+## [v4.0.3] - 2021-02-18
+
+### Bug Fixes
+
+This release fixes build failures caused by a small API breakage introduced in tendermint v0.34.7.
+
+* (sdk)  Bump SDK version to [v0.41.3](https://github.com/cosmos/cosmos-sdk/releases/tag/v0.41.3).
+
 ## [v4.0.2] - 2021-02-18
 
 ### Bug Fixes
@@ -245,7 +253,8 @@ See the [Tendermint v0.34.7 SDK changelog](https://github.com/tendermint/tenderm
 
 <!-- Release links -->
 
-[Unreleased]: https://github.com/cosmos/gaia/compare/v4.0.2...HEAD
+[Unreleased]: https://github.com/cosmos/gaia/compare/v4.0.3...HEAD
+[v4.0.3]: https://github.com/cosmos/gaia/releases/tag/v4.0.3
 [v4.0.2]: https://github.com/cosmos/gaia/releases/tag/v4.0.2
 [v4.0.1]: https://github.com/cosmos/gaia/releases/tag/v4.0.1
 [v4.0.0]: https://github.com/cosmos/gaia/releases/tag/v4.0.0
diff --git a/go.mod b/go.mod
index 79fadc817e..2f2668df2c 100644
--- a/go.mod
+++ b/go.mod
@@ -5,7 +5,7 @@ go 1.15
 require (
 	github.com/btcsuite/btcd v0.21.0-beta
 	github.com/btcsuite/btcutil v1.0.2
-	github.com/cosmos/cosmos-sdk v0.41.2
+	github.com/cosmos/cosmos-sdk v0.41.3
 	github.com/ethereum/go-ethereum v1.9.25
 	github.com/gorilla/mux v1.8.0
 	github.com/pkg/errors v0.9.1
diff --git a/go.sum b/go.sum
index 7da44e9d14..4097facb3c 100644
--- a/go.sum
+++ b/go.sum
@@ -124,8 +124,8 @@ github.com/coreos/go-systemd v0.0.0-20180511133405-39ca1b05acc7/go.mod h1:F5haX7
 github.com/coreos/go-systemd v0.0.0-20190321100706-95778dfbb74e/go.mod h1:F5haX7vjVVG0kc13fIWeqUViNPyEJxv/OmvnBo0Yme4=
 github.com/coreos/pkg v0.0.0-20160727233714-3ac0863d7acf/go.mod h1:E3G3o1h8I7cfcXa63jLwjI0eiQQMgzzUDFVpN/nH/eA=
 github.com/coreos/pkg v0.0.0-20180928190104-399ea9e2e55f/go.mod h1:E3G3o1h8I7cfcXa63jLwjI0eiQQMgzzUDFVpN/nH/eA=
-github.com/cosmos/cosmos-sdk v0.41.2 h1:tDJIBJ4dCsqg24kC4UPFHecatfw16SIa05mRml/7ju8=
-github.com/cosmos/cosmos-sdk v0.41.2/go.mod h1:yKN705My5fGGT93DrdoeZ96GPFLCVZrzDBciGf8/Ldo=
+github.com/cosmos/cosmos-sdk v0.41.3 h1:FQusz1vO0iyri5RBke2aMdx7aqj5Ma2/5c/4W9+u7ko=
+github.com/cosmos/cosmos-sdk v0.41.3/go.mod h1:yKN705My5fGGT93DrdoeZ96GPFLCVZrzDBciGf8/Ldo=
 github.com/cosmos/go-bip39 v0.0.0-20180819234021-555e2067c45d/go.mod h1:tSxLoYXyBmiFeKpvmq4dzayMdCjCnu8uqmCysIGBT2Y=
 github.com/cosmos/go-bip39 v1.0.0 h1:pcomnQdrdH22njcAatO0yWojsUnCO3y2tNoV1cb6hHY=
 github.com/cosmos/go-bip39 v1.0.0/go.mod h1:RNJv0H/pOIVgxw6KS7QeX2a0Uo0aKUlfhZ4xuwvCdJw=