docs: update changelog

CHANGELOG.md

@@ -5,8 +5,12 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
+## [Unreleased]
+
 ## V6.0.x - 2024-12-27
 
+### General
+- [#2162](https://github.com/regen-network/regen-ledger/pull/2162) Upgrade all modules to cosmos-sdk v0.47.13
 
 ### x/data
 
@@ -20,9 +24,6 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [v5.1.2](https://github.com/regen-network/regen-ledger/releases/tag/v5.1.2) - 2023-06-28
 
-### General
-- [#2162](https://github.com/regen-network/regen-ledger/pull/2162) Upgrade all modules to cosmos-sdk v0.47.13
-
 #### Changed
 
 - [#1942](https://github.com/regen-network/regen-ledger/pull/1942) Update all modules to cosmos-sdk v0.46.13-regen-1