diff --git a/CHANGELOG.md b/CHANGELOG.md
index 756049a..5ca9e8e 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,6 +1,11 @@
 # Change Log
 All notable changes to this project will be documented in this file.
 This project adheres to [Package Versioning Policy](https://wiki.haskell.org/Package_versioning_policy).
+## [0.4.0.1] - 2020-03-22
+
+### Fixed
+- MonadFail usage
+
 ## [0.4.0.0] - 2020-02-08
 
 ### Fixed
diff --git a/bson.cabal b/bson.cabal
index c4c21c9..4892bf0 100644
--- a/bson.cabal
+++ b/bson.cabal
@@ -1,5 +1,5 @@
 Name:          bson
-Version:       0.4.0.0
+Version:       0.4.0.1
 Synopsis:      BSON documents are JSON-like objects with a standard binary
                encoding.
 Description:   A BSON Document is an untyped (dynamically type-checked) record.