Added 4.0.2 release announcement

Author: hsbt

_posts/2025-12-17-4.0.2-released.md

@@ -0,0 +1,59 @@
+---
+title: 4.0.2 Released
+layout: post
+author: Hiroshi SHIBATA
+author_email: hsbt@ruby-lang.org
+---
+
+RubyGems 4.0.2 includes enhancements and Bundler 4.0.2 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=4.0.2
+
+## RubyGems Release Notes
+
+
+### Enhancements:
+
+* Pass down value of `BUNDLE_JOBS` to RubyGems before compiling &
+  introduce a new `gem install -j` flag. Pull request
+  [#9171](https://github.com/ruby/rubygems/pull/9171) by Edouard-chin
+* Installs bundler 4.0.2 as a default gem.
+
+
+## Bundler Release Notes
+
+
+### Enhancements:
+
+  - Support single quotes in mise format ruby version [#9183](https://github.com/ruby/rubygems/pull/9183)
+  - Tweak the Bundler's "X gems now installed message": [#9194](https://github.com/ruby/rubygems/pull/9194)
+
+### Bug fixes:
+
+  - Allow to show cli_help with `bundler` executable [#9198](https://github.com/ruby/rubygems/pull/9198)
+  - Allow bundle pristine to work for git gems in the same repo [#9196](https://github.com/ruby/rubygems/pull/9196)
+
+
+## Manual Installation
+
+To install RubyGems by hand see the [Download RubyGems][download] page.
+
+SHA256 Checksums:
+
+* rubygems-4.0.2.tgz  
+  a5fdbcbd3cbd616360fc9b82d75cdfa1aea3cf1aa357496d8aecce6574d85bf8
+* rubygems-4.0.2.zip  
+  9f395a4a1c1a6a3a85b94eadc1960d7455818099317ce1111f393a17adb59ae2
+* rubygems-update-4.0.2.gem  
+  f9d627eaee40c74d784274aa6ac7d74ddc468223d947f8ade136905944154883
+
+
+[download]: https://rubygems.org/pages/download
+