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diff --git a/activerecord/CHANGELOG.md b/activerecord/CHANGELOG.md
index 99c78ad934..794bb779fa 100644
--- a/activerecord/CHANGELOG.md
+++ b/activerecord/CHANGELOG.md
@@ -1,3 +1,43 @@
+*   Add alternate syntax to make `change_column_default` reversible.
+
+    User can pass in `:from` and `:to` to make `change_column_default` command
+    become reversible.
+
+    Example:
+
+        change_column_default :posts, :status, from: nil, to: "draft"
+        change_column_default :users, authorized, from: true, to: false
+
+    *Prem Sichanugrist*
+
+*   Prevent error when using `force_reload: true` on an unassigned polymorphic
+    belongs_to association.
+
+    Fixes #20426.
+
+    *James Dabbs*
+
+*   Correctly raise `ActiveRecord::AssociationTypeMismatch` when assigning
+    a wrong type to a namespaced association.
+
+    Fixes #20545.
+
+    *Diego Carrion*
+
+*   `validates_absence_of` respects `marked_for_destruction?`.
+
+    Fixes #20449.
+
+    *Yves Senn*
+
+*   Include the `Enumerable` module in `ActiveRecord::Relation`
+
+    *Sean Griffin & bogdan*
+
+*   Use `Enumerable#sum` in `ActiveRecord::Relation` if a block is given.
+
+    *Sean Griffin*
+
 *   Let `WITH` queries (Common Table Expressions) be explainable.
 
     *Vladimir Kochnev*