diff --git a/CHANGELOG.md b/CHANGELOG.md
index 69e6984..339515a 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -7,6 +7,12 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 
+## [0.3.1] - 2024-10-03
+### Fixed
+- Migrates the `setup.py` to a `pyproject.toml` configuration file.
+- Updates tests to automatically use the `coincbc` solver.
+
+
 ## [0.3.0] - 2024-04-04
 ### Added
 - Adds tests and examples
diff --git a/pyproject.toml b/pyproject.toml
index 2e6464a..ba361a5 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -4,7 +4,7 @@ build-backend = "setuptools.build_meta"
 
 [project]
 name="osier"
-version = "0.3.0"
+version = "0.3.1"
 description = "osier: A justice oriented energy system optimization tool"
 readme = "README.md"
 keywords = ["energy systems", "optimization", "multi-objective", "justice", "multi-criteria decision"]