diff --git a/CHANGELOG.md b/CHANGELOG.md
index d85bfb3..5032d01 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -4,6 +4,8 @@ This project adheres to [Semantic Versioning](http://semver.org/).
 
 ## [Unreleased]
 
+## [0.4.0] - 2020-12-17
+
 ### Changed
 - Require PHP >=7.3 or >=8.0
 - Upgrade php-cs-fixer dependency and fix-cs
@@ -37,5 +39,7 @@ This project adheres to [Semantic Versioning](http://semver.org/).
   - `SplFileObject::fputcsv`
   - `SplFileObject::setCsvControl`
 
-[unreleased]: https://github.com/ajgarlag/AjglCsvRfc/compare/0.2.0...master
+[unreleased]: https://github.com/ajgarlag/AjglCsvRfc/compare/0.4.0...master
+[0.4.0]: https://github.com/ajgarlag/AjglCsvRfc/compare/0.3.0...0.4.0
+[0.3.0]: https://github.com/ajgarlag/AjglCsvRfc/compare/0.2.0...0.3.0
 [0.2.0]: https://github.com/ajgarlag/AjglCsvRfc/compare/0.1.0...0.2.0
diff --git a/composer.json b/composer.json
index b3f6ef0..0f95260 100644
--- a/composer.json
+++ b/composer.json
@@ -39,7 +39,7 @@
     },
     "extra": {
         "branch-alias": {
-            "dev-master": "0.4.x-dev"
+            "dev-master": "0.5.x-dev"
         }
     }
 }