Changelog diff is:

diff --git a/Changes b/Changes
index f0f1ca5..97ed20a 100644
--- a/Changes
+++ b/Changes
@@ -2,6 +2,11 @@ Revision history for Perl extension Kossy
 
 {{$NEXT}}
 
+0.60 2021-09-16T12:04:10Z
+
+        - [IMCOMPATIBLE CHANGE] fix: defense from JSON hijacking (Thank you kfly8)
+        - Customize json serializer (Thank you kfly8)
+
 0.50 2021-08-26T13:49:56Z
 
         - add halt methods (Thank you kfly8)