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diff --git a/activesupport/CHANGELOG.md b/activesupport/CHANGELOG.md
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+++ b/activesupport/CHANGELOG.md
@@ -1,3 +1,66 @@
+*   Introduce `ActiveSupport::ActionableError`.
+
+    Actionable errors let's you dispatch actions from Rails' error pages. This
+    can help you save time if you have a clear action for the resolution of
+    common development errors.
+
+    The de-facto example are pending migrations. Every time pending migrations
+    are found, a middleware raises an error. With actionable errors, you can
+    run the migrations right from the error page. Other examples include Rails
+    plugins that need to run a rake task to setup themselves. They can now
+    raise actionable errors to run the setup straight from the error pages.
+
+    Here is how to define an actionable error:
+
+    ```ruby
+    class PendingMigrationError < MigrationError #:nodoc:
+      include ActiveSupport::ActionableError
+
+      action "Run pending migrations" do
+        ActiveRecord::Tasks::DatabaseTasks.migrate
+      end
+    end
+    ```
+
+    To make an error actionable, include the `ActiveSupport::ActionableError`
+    module and invoke the `action` class macro to define the action. An action
+    needs a name and a procedure to execute. The name is shown as the name of a
+    button on the error pages. Once clicked, it will invoke the given
+    procedure.
+
+    *Vipul A M*, *Yao Jie*, *Genadi Samokovarov*
+
+*   Preserve `html_safe?` status on `ActiveSupport::SafeBuffer#*`.
+
+    Before:
+
+        ("<br />".html_safe * 2).html_safe? #=> nil
+
+    After:
+
+        ("<br />".html_safe * 2).html_safe? #=> true
+
+    *Ryo Nakamura*
+
+*   Calling test methods with `with_info_handler` method to allow minitest-hooks
+    plugin to work.
+
+    *Mauri Mustonen*
+
+*   The Zeitwerk compatibility interface for `ActiveSupport::Dependencies` no
+    longer implements `autoloaded_constants` or `autoloaded?` (undocumented,
+    anyway). Experience shows introspection does not have many use cases, and
+    troubleshooting is done by logging. With this design trade-off we are able
+    to use even less memory in all environments.
+
+    *Xavier Noria*
+
+*   Depends on Zeitwerk 2, which stores less metadata if reloading is disabled
+    and hence uses less memory when `config.cache_classes` is `true`, a standard
+    setup in production.
+
+    *Xavier Noria*
+
 *   In `:zeitwerk` mode, eager load directories in engines and applications only
     if present in their respective `config.eager_load_paths`.