blog: Fluentd v1.20.1 has been released

content/blog/20261026_fluentd-v1.20.1-has-been-released.md

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+# Fluentd v1.20.1 has been released
+
+Hi users!
+
+We released v1.20.1 on October 26, 2026.
+ChangeLog is [here](https://github.com/fluent/fluentd/blob/master/CHANGELOG.md#release-v1201---20261026).
+
+This release is a maintenance release for the v1.20 series.
+It removes `yajl-ruby` from the runtime dependencies of Fluentd, so that Fluentd can be installed on Ruby 4.1.
+
+<div markdown="span" class="alert alert-danger" role="alert">
+<b>Note for plugin developers and users:</b>
+<p>
+  Fluentd no longer installs <code>yajl-ruby</code>.
+  A plugin that uses <code>require 'yajl'</code> without declaring <code>yajl-ruby</code> in its gemspec fails to load.
+  Please see the "yajl-ruby is no longer a dependency" section below.
+</p>
+</div>
+
+## yajl-ruby is no longer a dependency
+
+In the v1.20.0 announcement, we said that Fluentd keeps `yajl-ruby` as a dependency for a while.
+We kept it because some third-party plugins `require 'yajl'` without declaring it in their gemspec.
+
+However, `yajl-ruby` cannot be built on Ruby 4.1, which is under development.
+The gemspec of Fluentd v1.20.0 adds the dependency only for Ruby 4.0 or earlier.
+This condition is evaluated only when the gem is built, so the released gem always depends on `yajl-ruby`.
+As a result, `gem install fluentd` fails on Ruby 4.1.
+
+Fluentd itself has not used `yajl-ruby` since v1.20.0.
+So we removed it from the dependencies in this release. ([#5574](https://github.com/fluent/fluentd/pull/5574))
+
+### For plugin developers
+
+If your plugin uses `require 'yajl'`, please migrate to the `json` gem.
+If you keep using `yajl-ruby`, please add it to the dependencies of your gemspec.
+
+```ruby
+spec.add_runtime_dependency("yajl-ruby", "~> 1.4")
+```
+
+Note that `yajl-ruby` cannot be installed on Ruby 4.1 at the moment.
+
+### For users
+
+If you see the following error after upgrading Fluentd, one of your plugins uses `yajl-ruby` without declaring it.
+
+```
+LoadError: cannot load such file -- yajl
+```
+
+You can avoid it by adding `yajl-ruby` to your Gemfile, or by running `gem install yajl-ruby`.
+This works only on Ruby 4.0 or earlier.
+
+`fluent-package` already bundles `yajl-ruby`, so its users are not affected.
+
+Enjoy logging!
+
+### Follow us on X
+
+We have been posting information about Fluentd in Japanese on [@fluentd_jp](https://x.com/fluentd_jp).
+We would appreciate it if you followed the X account.
+
+TAG: Fluentd Announcement
+AUTHOR: clearcode

content/blog/tag/announcement

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 /blog/20260814_fluent-package-v7-scheduled-lifecycle
 /blog/20260929_fluent-package-v6.0.5-has-been-released
 /blog/20260929_fluentd-v1.19.4-has-been-released
-/blog/20261023_fluentd-v1.20.0-has-been-released
+/blog/20261023_fluentd-v1.20.0-has-been-released
+/blog/20261026_fluentd-v1.20.1-has-been-released

content/blog/tag/fluentd

@@ -175,4 +175,5 @@
 /blog/20260814_fluent-package-v7-scheduled-lifecycle
 /blog/20260929_fluent-package-v6.0.5-has-been-released
 /blog/20260929_fluentd-v1.19.4-has-been-released
-/blog/20261023_fluentd-v1.20.0-has-been-released
+/blog/20261023_fluentd-v1.20.0-has-been-released
+/blog/20261026_fluentd-v1.20.1-has-been-released