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diff --git a/activesupport/CHANGELOG.md b/activesupport/CHANGELOG.md
index 7feb820d4f..237d1d71ae 100644
--- a/activesupport/CHANGELOG.md
+++ b/activesupport/CHANGELOG.md
@@ -1,3 +1,108 @@
+*   Fixed confusing `DelegationError` in `Module#delegate`.
+
+    See #15186.
+
+    *Vladimir Yarotsky*
+
+*   Fixed `ActiveSupport::Subscriber` so that no duplicate subscriber is created
+    when a subscriber method is redefined.
+
+    *Dennis Schön*
+
+*   Remove deprecated string based terminators for `ActiveSupport::Callbacks`.
+
+    *Eileen M. Uchitelle*
+
+*   Fixed an issue when using
+    `ActiveSupport::NumberHelper::NumberToDelimitedConverter` to
+    convert a value that is an `ActiveSupport::SafeBuffer` introduced
+    in 2da9d67.
+
+    See #15064.
+
+    *Mark J. Titorenko*
+
+*   `TimeZone#parse` defaults the day of the month to '1' if any other date
+    components are specified. This is more consistent with the behavior of
+    `Time#parse`.
+
+    *Ulysse Carion*
+
+*   `humanize` strips leading underscores, if any.
+
+    Before:
+
+        '_id'.humanize # => ""
+
+    After:
+
+        '_id'.humanize # => "Id"
+
+    *Xavier Noria*
+
+*   Fixed backward compatibility isues introduced in 326e652.
+
+    Empty Hash or Array should not present in serialization result.
+
+        {a: []}.to_query # => ""
+        {a: {}}.to_query # => ""
+
+    For more info see #14948.
+
+    *Bogdan Gusiev*
+
+*   Add `SecureRandom::uuid_v3` and `SecureRandom::uuid_v5` to support stable
+    UUID fixtures on PostgreSQL.
+
+    *Roderick van Domburg*
+
+*   Fixed `ActiveSupport::Duration#eql?` so that `1.second.eql?(1.second)` is
+    true.
+
+    This fixes the current situation of:
+
+        1.second.eql?(1.second) #=> false
+
+    `eql?` also requires that the other object is an `ActiveSupport::Duration`.
+    This requirement makes `ActiveSupport::Duration`'s behavior consistent with
+    the behavior of Ruby's numeric types:
+
+        1.eql?(1.0) #=> false
+        1.0.eql?(1) #=> false
+
+        1.second.eql?(1) #=> false (was true)
+        1.eql?(1.second) #=> false
+
+        { 1 => "foo", 1.0 => "bar" }
+        #=> { 1 => "foo", 1.0 => "bar" }
+
+        { 1 => "foo", 1.second => "bar" }
+        # now => { 1 => "foo", 1.second => "bar" }
+        # was => { 1 => "bar" }
+
+    And though the behavior of these hasn't changed, for reference:
+
+        1 == 1.0 #=> true
+        1.0 == 1 #=> true
+
+        1 == 1.second #=> true
+        1.second == 1 #=> true
+
+    *Emily Dobervich*
+
+*   `ActiveSupport::SafeBuffer#prepend` acts like `String#prepend` and modifies
+    instance in-place, returning self. `ActiveSupport::SafeBuffer#prepend!` is
+    deprecated.
+
+    *Pavel Pravosud*
+
+*   `HashWithIndifferentAccess` better respects `#to_hash` on objects it's
+    given. In particular, `.new`, `#update`, `#merge`, `#replace` all accept
+    objects which respond to `#to_hash`, even if those objects are not Hashes
+    directly.
+
+    *Peter Jaros*
+
 *   Deprecate `Class#superclass_delegating_accessor`, use `Class#class_attribute` instead.
 
     *Akshay Vishnoi*