diff --git a/CHANGELOG.markdown b/CHANGELOG.markdown
index cfcb690..aef6fcc 100644
--- a/CHANGELOG.markdown
+++ b/CHANGELOG.markdown
@@ -1,3 +1,7 @@
+## Customerio 5.2.0 - December 8, 2023
+### Changed
+- The `identify` method will now automatically use the `cio_id` attribute as the customer ID when calling the track service. This allows a customer to be updated using `identify` to modify the `id` and `email` attributes.
+
 ## Customerio 5.1.0 - May 5, 2023
 ### Added
 - Added `send_push` to `APIClient` and `SendPushRequest` to support sending transactional push notifications.
diff --git a/lib/customerio/version.rb b/lib/customerio/version.rb
index d5e7a94..82b8bbb 100644
--- a/lib/customerio/version.rb
+++ b/lib/customerio/version.rb
@@ -1,3 +1,3 @@
 module Customerio
-  VERSION = "5.1.0"
+  VERSION = "5.2.0"
 end