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diff --git a/activemodel/CHANGELOG.md b/activemodel/CHANGELOG.md
index e707a65147..b67a803b9d 100644
--- a/activemodel/CHANGELOG.md
+++ b/activemodel/CHANGELOG.md
@@ -1,3 +1,31 @@
+*   Fix to working before/after validation callbacks on multiple contexts.
+
+    *Yoshiyuki Hirano*
+
+## Rails 5.2.0.beta2 (November 28, 2017) ##
+
+*   No changes.
+
+
+## Rails 5.2.0.beta1 (November 27, 2017) ##
+
+*   Execute `ConfirmationValidator` validation when `_confirmation`'s value is `false`.
+
+    *bogdanvlviv*
+
+*   Allow passing a Proc or Symbol to length validator options.
+
+    *Matt Rohrer*
+
+*   Add method `#merge!` for `ActiveModel::Errors`.
+
+    *Jahfer Husain*
+
+*   Fix regression in numericality validator when comparing Decimal and Float input
+    values with more scale than the schema.
+
+    *Bradley Priest*
+
 *   Fix methods `#keys`, `#values` in `ActiveModel::Errors`.
 
     Change `#keys` to only return the keys that don't have empty messages.