diff --git a/CHANGELOG.md b/CHANGELOG.md
index 4d2f584..1aa95b5 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -9,6 +9,13 @@ All notable changes to this project will be documented in this file.
 
 [Documentation](https://cr-nimble.readthedocs.io/en/latest/)
 
+## [0.4.0] - 2023-10-15
+
+[Documentation](https://cr-nimble.readthedocs.io/en/v0.4.0/)
+
+This is a maintenance release to align the library with
+JAX 0.4.x.
+
 
 ## [0.3.2] - 2022-10-08
 
@@ -170,7 +177,8 @@ Metrics
 Initial release by refactoring code from `cr-nimble`.
 
 
-[Unreleased]: https://github.com/carnotresearch/cr-nimble/compare/v0.3.2...HEAD
+[Unreleased]: https://github.com/carnotresearch/cr-nimble/compare/v0.4.0...HEAD
+[0.4.0]: https://github.com/carnotresearch/cr-nimble/compare/v0.3.2...v0.4.0
 [0.3.2]: https://github.com/carnotresearch/cr-nimble/compare/v0.3.1...v0.3.2
 [0.3.1]: https://github.com/carnotresearch/cr-nimble/compare/v0.3.0...v0.3.1
 [0.3.0]: https://github.com/carnotresearch/cr-nimble/compare/v0.2.4...v0.3.0