diff --git a/ChangeLog.md b/ChangeLog.md
index d85e07a9..d2c51393 100644
--- a/ChangeLog.md
+++ b/ChangeLog.md
@@ -4,13 +4,13 @@
 - Improve controller search functions
 - Improve uechosearch example to output more detailed properties of searched devices using the standard database
 
-## v1.2.1 (2022-12-xx)
+## v1.2.1 (2022-12-10)
 - Improve standard objects to set more default standard properties
 - Update standard device objects to add extra device and definitions
 - Update standard manufactuer codes
 - Update uechopost not to wait when the specified request message does not require the response messages
 
-## v1.2.0 (2022-12-10)
+## v1.2.0 (2022-12-09)
 - Update RequestHandler to pass a mutable destination object to write and return a latest property data for read reuests data by the request handler
 - Updated Device::new() to output warnings when the standart object is not found