diff --git a/CHANGELOG.md b/CHANGELOG.md
index 52e262e76f48456fc4f853679fb90b8c42dbb0c7..9aab97d44341e989968d49d902d3f97e8a77bea1 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -5,6 +5,22 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.1.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
+
+## [Unreleased]
+
+### Added
+
+### Changed
+
+### Deprecated
+
+### Removed
+
+### Fixed
+
+### Security
+
+
 ## [0.2] - 2022-03-25
 (Timm Fitschen)
 
diff --git a/CMakeLists.txt b/CMakeLists.txt
index 58057e0bf768b85b1ffb7b69de0e0a682b73b466..39d1bdf0a2624c404d7dc029e9e163f061de427c 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -20,7 +20,7 @@
 
 cmake_minimum_required(VERSION 3.13)
 
-set(CAOSDB_PROTO_VERSION 0.2.0)
+set(CAOSDB_PROTO_VERSION 0.3.0)
 
 project("caosdb-proto"
     VERSION ${CAOSDB_PROTO_VERSION}
diff --git a/RELEASE_GUIDELINES.md b/RELEASE_GUIDELINES.md
index 6dc4fafcb338ed88b7fa03798b09624d8c51f538..fbdb4a233d050d42cc1b1ba8598a414e3ae2d6a6 100644
--- a/RELEASE_GUIDELINES.md
+++ b/RELEASE_GUIDELINES.md
@@ -19,11 +19,15 @@ guidelines of the CaosDB Project
 
 3. Check all general prerequisites.
 
-4. Prepare [CMakeLists.txt](./CMakeLists.txt): Check the `MAJOR`, `MINOR`, `PATCH`
-   version variables.
+4. Prepare [CMakeLists.txt](./CMakeLists.txt): Check the `CAOSDB_PROTO_VERSION`
+   version variable.
 
 5. Merge the release branch into the main branch.
 
 6. Tag the latest commit of the main branch with `v<VERSION>`.
 
 7. Delete the release branch.
+
+8. Prepare the next release cycle by updating
+   [CMakeLists.txt](./CMakeLists.txt) - bump the version number of
+   `CAOSDB_PROTO_VERSION` to the next minor number.