Added 4.0.4 release announcement

Author: hsbt

_posts/2026-01-15-4.0.4-released.md

@@ -0,0 +1,63 @@
+---
+title: 4.0.4 Released
+layout: post
+author: Hiroshi SHIBATA
+author_email: hsbt@ruby-lang.org
+---
+
+RubyGems 4.0.4 includes enhancements and bug fixes and Bundler 4.0.4 includes enhancements and bug fixes.
+
+To update to the latest RubyGems you can run:
+
+    gem update --system [--pre]
+
+To update to the latest Bundler you can run:
+
+    gem install bundler [--pre]
+    bundle update --bundler=4.0.4
+
+## RubyGems Release Notes
+
+
+### Enhancements:
+
+* Remove date require from rebuild command. Pull request
+  [#9232](https://github.com/ruby/rubygems/pull/9232) by jeremyevans
+* Installs bundler 4.0.4 as a default gem.
+
+### Bug fixes:
+
+* Add a missing "require 'etc'" statement:. Pull request
+  [#9242](https://github.com/ruby/rubygems/pull/9242) by Edouard-chin
+
+
+## Bundler Release Notes
+
+
+### Enhancements:
+
+  - Validate more options for add sub-command [#5905](https://github.com/ruby/rubygems/pull/5905)
+  - Support Ruby 4.1 [#9219](https://github.com/ruby/rubygems/pull/9219)
+
+### Bug fixes:
+
+  - Fix dependency source bug in bundler [#9213](https://github.com/ruby/rubygems/pull/9213)
+  - Retain current bundler version on `bundle clean` [#9221](https://github.com/ruby/rubygems/pull/9221)
+
+
+## Manual Installation
+
+To install RubyGems by hand see the [Download RubyGems][download] page.
+
+SHA256 Checksums:
+
+* rubygems-4.0.4.tgz  
+  89668a8eaba1a53c6f525221ab58cfe901dae41765b6f5e7ad2bd9c3119421e8
+* rubygems-4.0.4.zip  
+  eec3ac3fb8bc00ec8797c495b4aaa5930ad0539304bbe419761f8a4194ab29a8
+* rubygems-update-4.0.4.gem  
+  3c9f05b54dacb41ac6385f3793566a7b0ad7a0519fc412aa9bebdb181ed1dbd8
+
+
+[download]: https://rubygems.org/pages/download
+