diff --git a/CHANGELOG.md b/CHANGELOG.md
index 88f8ed0..62b6b7e 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -6,6 +6,10 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 
+## [0.12.1] - 2024-08-12
+### Changed
+- Updated machine-emulator version to v0.18.1
+
 ## [0.12.0] - 2024-08-12
 ### Changed
 - Updated machine-emulator version to v0.18.0
@@ -96,7 +100,8 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - [0.2.0]
 - [0.1.0]
 
-[Unreleased]: https://github.com/cartesi/machine-solidity-step/compare/v0.12.0...HEAD
+[Unreleased]: https://github.com/cartesi/machine-solidity-step/compare/v0.12.1...HEAD
+[0.12.1]: https://github.com/cartesi/machine-solidity-step/releases/tag/v0.12.1
 [0.12.0]: https://github.com/cartesi/machine-solidity-step/releases/tag/v0.12.0
 [0.11.0]: https://github.com/cartesi/machine-solidity-step/releases/tag/v0.11.0
 [0.10.1]: https://github.com/cartesi/machine-solidity-step/releases/tag/v0.10.1
diff --git a/package.json b/package.json
index ca3d3b4..5c93ace 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
     "name": "@cartesi/machine-solidity-step",
-    "version": "0.12.0",
+    "version": "0.12.1",
     "description": "Machine Solidity UArch Interpret",
     "repository": {
         "type": "git",