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diff --git a/actionpack/CHANGELOG.md b/actionpack/CHANGELOG.md
index 7c460fbaef..ddacbe2aa2 100644
--- a/actionpack/CHANGELOG.md
+++ b/actionpack/CHANGELOG.md
@@ -1,3 +1,43 @@
+*   Deleted the deprecated TagAssertions.
+
+    *Kasper Timm Hansen*
+
+*   Use the Active Support JSON encoder for cookie jars using the `:json` or
+    `:hybrid` serializer. This allows you to serialize custom Ruby objects into
+    cookies by defining the `#as_json` hook on such objects.
+
+    Fixes #16520.
+
+    *Godfrey Chan*
+
+*   Add `config.action_dispatch.cookies_digest` option for setting custom
+    digest. The default remains the same - 'SHA1'.
+
+    *Łukasz Strzałkowski*
+
+*   Move `respond_with` (and the class-level `respond_to`) to
+    the `responders` gem.
+
+    *José Valim*
+
+*   When your templates change, browser caches bust automatically.
+
+    New default: the template digest is automatically included in your ETags.
+    When you call `fresh_when @post`, the digest for `posts/show.html.erb`
+    is mixed in so future changes to the HTML will blow HTTP caches for you.
+    This makes it easy to HTTP-cache many more of your actions.
+
+    If you render a different template, you can now pass the `:template`
+    option to include its digest instead:
+
+      fresh_when @post, template: 'widgets/show'
+
+    Pass `template: false` to skip the lookup. To turn this off entirely, set:
+
+      config.action_controller.etag_with_template_digest = false
+
+    *Jeremy Kemper*
+
 *   Remove deprecated `AbstractController::Helpers::ClassMethods::MissingHelperError`
     in favor of `AbstractController::Helpers::MissingHelperError`.