diff --git a/CHANGELOG.md b/CHANGELOG.md
index 8a2e19e87..0d8b1a061 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -3,16 +3,17 @@
 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).
+and this project adheres to [Calendar Versioning](https://calver.org).
 
 ## [Unreleased]
 
 ### Added
 - New command called `pontos-update-header` to update years in copyright headers [#58](https://github.com/greenbone/pontos/pull/58)
-- Tests for `pontos-update-header` added. [#59](https://github.com/greenbone/pontos/pull/59)
+- Tests for `pontos-update-header` added. [#59](https://github.com/greenbone/pontos/pull/59)[#60](https://github.com/greenbone/pontos/pull/60)
 
 ### Changed
 - Renamed `pontos-copyright` to `pontos-update-header`. This tool now adds copyright header to files, if missing. [#59](https://github.com/greenbone/pontos/pull/59)
+- Change versioning to [Calendar Versioning](https://calver.org)[#61](https://github.com/greenbone/pontos/pull/61)
 
 ### Deprecated
 ### Removed
diff --git a/RELEASE.md b/RELEASE.md
index 9286d202f..44a9e6f31 100644
--- a/RELEASE.md
+++ b/RELEASE.md
@@ -1,7 +1,7 @@
 # Release instructions
 
 Before creating a new release please do a careful consideration about the
-version number for the new release. We are following [Semantic Versioning](https://semver.org/)
+version number for the new release. We are following [Calendar Versioning](https://calver.org)
 and [PEP440](https://www.python.org/dev/peps/pep-0440/).
 
 ## Preparing the Required Python Packages