Prepare release v309 (heroku#1596)

heroku-linguist[bot] · web-flow · commit ec90a61eb405 · 2025-05-19T16:33:40.000Z
Co-authored-by: heroku-linguist[bot] &lt;136119646+heroku-linguist[bot]@users.noreply.github.com&gt;
diff --git a/CHANGELOG.md b/CHANGELOG.md
@@ -2,6 +2,9 @@
 
 ## [Unreleased]
 
+
+## [v309] - 2025-05-19
+
 - Default Ruby version is now 3.3.8 (https://github.com/heroku/heroku-buildpack-ruby/pull/1595)
 
 ## [v308] - 2025-05-15
@@ -1704,7 +1707,8 @@ Bugfixes:
 * Change gem detection to use lockfile parser
 * use `$RACK_ENV` when thin is detected for rack apps
 
-[unreleased]: https://github.com/heroku/heroku-buildpack-ruby/compare/v308...main
+[unreleased]: https://github.com/heroku/heroku-buildpack-ruby/compare/v309...main
+[v309]: https://github.com/heroku/heroku-buildpack-ruby/compare/v308...v309
 [v308]: https://github.com/heroku/heroku-buildpack-ruby/compare/v307...v308
 [v307]: https://github.com/heroku/heroku-buildpack-ruby/compare/v306...v307
 [v306]: https://github.com/heroku/heroku-buildpack-ruby/compare/v305...v306
diff --git a/changelogs/v309/default_ruby.md b/changelogs/v309/default_ruby.md
diff --git a/lib/language_pack/version.rb b/lib/language_pack/version.rb
@@ -2,6 +2,6 @@
 
 module LanguagePack
   class LanguagePack::Base
-    BUILDPACK_VERSION = "v308"
+    BUILDPACK_VERSION = "v309"
   end
 end
