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diff --git a/actionpack/CHANGELOG.md b/actionpack/CHANGELOG.md
index 0134bf7cab..2cbe09e3e7 100644
--- a/actionpack/CHANGELOG.md
+++ b/actionpack/CHANGELOG.md
@@ -1,3 +1,40 @@
+*   Fix regression where a gzip file response would have a Content-type,
+    even when it was a 304 status code.
+
+    See #19271.
+
+    *Kohei Suzuki*
+
+*   Fix handling of empty X_FORWARDED_HOST header in raw_host_with_port
+
+    Previously, an empty X_FORWARDED_HOST header would cause
+    Actiondispatch::Http:URL.raw_host_with_port to return nil, causing
+    Actiondispatch::Http:URL.host to raise a NoMethodError.
+
+    *Adam Forsyth*
+
+*   Drop request class from RouteSet constructor.
+ 
+    If you would like to use a custom request class, please subclass and implement
+    the `request_class` method.
+
+    *tenderlove@ruby-lang.org*
+
+*   Fallback to `ENV['RAILS_RELATIVE_URL_ROOT']` in `url_for`.
+
+    Fixed an issue where the `RAILS_RELATIVE_URL_ROOT` environment variable is not
+    prepended to the path when `url_for` is called. If `SCRIPT_NAME` (used by Rack)
+    is set, it takes precedence.
+
+    Fixes #5122.
+
+    *Yasyf Mohamedali*
+
+*   Partitioning of routes is now done when the routes are being drawn. This
+    helps to decrease the time spent filtering the routes during the first request.
+
+    *Guo Xiang Tan*
+
 *   Fix regression in functional tests. Responses should have default headers
     assigned.