Added 4.0.5 release announcement

Author: hsbt

_posts/2026-01-29-4.0.5-released.md

@@ -0,0 +1,70 @@
+---
+title: 4.0.5 Released
+layout: post
+author: Hiroshi SHIBATA
+author_email: hsbt@ruby-lang.org
+---
+
+RubyGems 4.0.5 includes enhancements, bug fixes and documentation and Bundler 4.0.5 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=4.0.5
+
+## RubyGems Release Notes
+
+
+### Enhancements:
+
+* Removed unused deprecate loading. Pull request
+  [#9266](https://github.com/ruby/rubygems/pull/9266) by hsbt
+* Validate executable names for invalid characters. Pull request
+  [#9257](https://github.com/ruby/rubygems/pull/9257) by hsbt
+* Installs bundler 4.0.5 as a default gem.
+
+### Bug fixes:
+
+* Fix RubyGems not able to require the right gem:. Pull request
+  [#9246](https://github.com/ruby/rubygems/pull/9246) by Edouard-chin
+* Remove special behavior for rake. Pull request
+  [#9245](https://github.com/ruby/rubygems/pull/9245) by JasonLunn
+
+### Documentation:
+
+* Added another usage of pristine command. Pull request
+  [#9255](https://github.com/ruby/rubygems/pull/9255) by hsbt
+
+
+## Bundler Release Notes
+
+
+### Enhancements:
+
+  - Fix Bundler that re-exec $0 when a `version` is present in the config: [#9249](https://github.com/ruby/rubygems/pull/9249)
+
+### Bug fixes:
+
+  - Only use parent source with Git and Path sources [#9269](https://github.com/ruby/rubygems/pull/9269)
+
+
+## Manual Installation
+
+To install RubyGems by hand see the [Download RubyGems][download] page.
+
+SHA256 Checksums:
+
+* rubygems-4.0.5.tgz  
+  f3d3be045119301be1f2dbb4d6ac018a76f2969a367cf072c94ce06392961c75
+* rubygems-4.0.5.zip  
+  a890bd73dd7f9382cdf9e89655f8b626eac919080a8e67d5cfffb74ee5bd24d4
+* rubygems-update-4.0.5.gem  
+  00f14f539debafb3c207cf4d5af097bd458bc57d12538354275da3ebdc8276a0
+
+
+[download]: https://rubygems.org/pages/download
+