CHANGES.md in twilio-ruby-5.12.2 vs CHANGES.md in twilio-ruby-5.12.3

@@ -1,7 +1,13 @@
 twilio-ruby changelog
 =====================
 
+[2018-08-23] Version 5.12.3
+----------------------------
+**Chat**
+- Add User Channel instance resource
+
+
 [2018-08-17] Version 5.12.2
 ----------------------------
 **Api**
 - Add Proxy Active Sessions category to usage records