diff --git a/CHANGELOG.md b/CHANGELOG.md
index bddb10f..24601d0 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -9,6 +9,17 @@ and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.
 [Unreleased]: https://github.com/althonos/pyrodigal/compare/v0.3.1...HEAD
 
 
+## [v0.4.0] - 2022-08-04
+[v0.3.1]: https://github.com/althonos/pyrodigal/compare/v0.3.1...v0.4.0
+
+### Added
+- Multi-threaded computation of fragment mapping in `Mapper.query_draft` and `Mapper.query_genome`.
+
+### Fixed
+- NEON-specific compile flags in `setup.py` for Aarch64 target platforms.
+- Broken compilation for Arm platforms because of missing header guards.
+
+
 ## [v0.3.1] - 2022-07-22
 [v0.3.1]: https://github.com/althonos/pyrodigal/compare/v0.3.0...v0.3.1
 
diff --git a/pyfastani/__init__.py b/pyfastani/__init__.py
index 54b98c2..346c975 100644
--- a/pyfastani/__init__.py
+++ b/pyfastani/__init__.py
@@ -12,7 +12,7 @@
 
 __author__ = "Martin Larralde <martin.larralde@embl.de>"
 __license__ = "MIT"
-__version__ = "0.3.1"
+__version__ = "0.4.0"
 
 __doc__ = _fastani.__doc__
 __all__ = [