diff --git a/actionmailer/CHANGELOG.md b/actionmailer/CHANGELOG.md
index 3907e930972..8f74ac09285 100644
--- a/actionmailer/CHANGELOG.md
+++ b/actionmailer/CHANGELOG.md
@@ -1,3 +1,6 @@
+## Rails 4.0.0 (unreleased) ##
+
+
 ## Rails 4.0.0.beta1 (February 25, 2013) ##
 
 *   Allow passing interpolations to `#default_i18n_subject`, e.g.:
diff --git a/actionpack/CHANGELOG.md b/actionpack/CHANGELOG.md
index 5197d944b1c..8ae23598b4e 100644
--- a/actionpack/CHANGELOG.md
+++ b/actionpack/CHANGELOG.md
@@ -1,3 +1,6 @@
+## Rails 4.0.0 (unreleased) ##
+
+
 ## Rails 4.0.0.beta1 (February 25, 2013) ##
 
 *   Fix `respond_to` not using formats that have no block if all is present. *Michael Grosser*
diff --git a/activemodel/CHANGELOG.md b/activemodel/CHANGELOG.md
index 227374b3319..1fe6dbd4d96 100644
--- a/activemodel/CHANGELOG.md
+++ b/activemodel/CHANGELOG.md
@@ -1,3 +1,6 @@
+## Rails 4.0.0 (unreleased) ##
+
+
 ## Rails 4.0.0.beta1 (February 25, 2013) ##
 
 *   Add `ActiveModel::Validations::AbsenceValidator`, a validator to check the
diff --git a/activerecord/CHANGELOG.md b/activerecord/CHANGELOG.md
index 3fbf043c7c7..982fbdc2367 100644
--- a/activerecord/CHANGELOG.md
+++ b/activerecord/CHANGELOG.md
@@ -1,8 +1,4 @@
-## Rails 4.0.0.beta1 (February 25, 2013) ##
-
-*   Fix overriding of attributes by default_scope on `ActiveRecord::Base#dup`.
-
-    *Hiroshige UMINO*
+## Rails 4.0.0 (unreleased) ##
 
 *   Fix when performing an ordered join query. The bug only
     affected queries where the order was given with a symbol.
@@ -13,6 +9,17 @@
         # This will expand the order :name to "authors".name.
         Author.joins(:books).where('books.published = 1').order(:name)
 
+
+## Rails 4.0.0.beta1 (February 25, 2013) ##
+
+*   Fix overriding of attributes by default_scope on `ActiveRecord::Base#dup`.
+
+    *Hiroshige UMINO*
+
+*   Update queries now use prepared statements.
+
+    *Olli Rissanen*
+
 *   Fixing issue #8345. Now throwing an error when one attempts to touch a
     new object that has not yet been persisted. For instance:
 
diff --git a/activesupport/CHANGELOG.md b/activesupport/CHANGELOG.md
index 97b3344db02..e76af6adc47 100644
--- a/activesupport/CHANGELOG.md
+++ b/activesupport/CHANGELOG.md
@@ -1,3 +1,6 @@
+## Rails 4.0.0 (unreleased) ##
+
+
 ## Rails 4.0.0.beta1 (February 25, 2013) ##
 
 *   Prevent `DateTime#change` from truncating the second fraction, when seconds
diff --git a/guides/CHANGELOG.md b/guides/CHANGELOG.md
index a9595d1f158..ee6e64b7316 100644
--- a/guides/CHANGELOG.md
+++ b/guides/CHANGELOG.md
@@ -1,3 +1,6 @@
+## Rails 4.0.0 (unreleased) ##
+
+
 ## Rails 4.0.0.beta1 (unreleased) ##
 
 *   Split Validations and Callbacks guide into two. *Steve Klabnik*
diff --git a/railties/CHANGELOG.md b/railties/CHANGELOG.md
index 5efdbfecc65..f3c07470af5 100644
--- a/railties/CHANGELOG.md
+++ b/railties/CHANGELOG.md
@@ -1,3 +1,6 @@
+## Rails 4.0.0 (unreleased) ##
+
+
 ## Rails 4.0.0.beta1 (February 25, 2013) ##
 
 *   Improve `rake stats` for JavaScript and CoffeeScript: ignore block comments