diff --git a/CHANGELOG.md b/CHANGELOG.md
index d69f338..e8ac9f7 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -7,6 +7,8 @@ and this project adheres to [Dart Package Versioning](https://dart.dev/tools/pub
 
 ## [Unreleased]
 
+## [0.4.0] - 2021-09-10
+
 ### Changed
 
 - rename 'less' and 'great' ctor. parameters to 'short' and 'long' — **Breaking
diff --git a/pubspec.yaml b/pubspec.yaml
index 6978a8c..a684f47 100644
--- a/pubspec.yaml
+++ b/pubspec.yaml
@@ -1,6 +1,6 @@
 name: well_formed
 description: A form fields package designed to relieve developers of much of the burden of form-related coding. It provides field masking, validation, smart trimming, and more.
-version: 0.3.8
+version: 0.4.0
 homepage: https://dartoos.dev
 repository: https://github.com/dartoos-dev/well_formed