diff --git a/CHANGELOG.md b/CHANGELOG.md
index 0c80cb9..5df31e8 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -5,6 +5,8 @@ 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
+
 ## 1.3.1 
 ### Fixed
 - `getFailedAsserts()` and `isSchematronValid()` in [DefaultResult.java](https://github.com/itplr-kosit/validator/blob/master/src/main/java/de/kosit/validationtool/impl/DefaultResult.java)