diff --git a/CHANGELOG.md b/CHANGELOG.md
index 29f6d06..46a0804 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -6,7 +6,7 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.1.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
 
-## Unreleased
+## [2.0a1] - 2023-08-20
 
 This release separates out casm/clexulator from CASM v1. It creates a Python package, libcasm.clexulator, that enables using casm/clexulator and may be installed via pip install, using scikit-build, CMake, and pybind11. This release also includes usage and API documentation for using libcasm.clexulator, built using Sphinx.