diff --git a/CHANGELOG.md b/CHANGELOG.md
index 8fe3f9a..6d265cb 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -7,6 +7,11 @@ and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.
 ## Unreleased
 -  No changes yet.
 
+## v0.3.1 - 2024-03-04
+### Fixed
+- Fixed a bug related to maxSlack boundary detection. #124
+  Thanks to @smallnest for reporting and @storozhukBM for fixing.
+
 ## v0.3.0 - 2023-07-08
 ### Changed
 - Switched to a more efficient internal implementation. No API or behavior changes.