diff --git a/CMakeLists.txt b/CMakeLists.txt
index fa8e56fc1737c9b1eb3b20cce26bb0a08e976fbd..8c6abf80af9751163d43890035f66d0fd46b6cf1 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -20,11 +20,11 @@
 
 cmake_minimum_required(VERSION 3.13)
 
-set(libcaosdb_VERSION 0.2.0)
+set(libcaosdb_VERSION 0.3.0-dev)
 set(libcaosdb_COMPATIBLE_SERVER_VERSION_MAJOR 0)
-set(libcaosdb_COMPATIBLE_SERVER_VERSION_MINOR 8)
+set(libcaosdb_COMPATIBLE_SERVER_VERSION_MINOR 9)
 set(libcaosdb_COMPATIBLE_SERVER_VERSION_PATCH 0)
-set(libcaosdb_COMPATIBLE_SERVER_VERSION_PRE_RELEASE "")
+set(libcaosdb_COMPATIBLE_SERVER_VERSION_PRE_RELEASE "SNAPSHOT")
 
 project(libcaosdb
     VERSION ${libcaosdb_VERSION}
diff --git a/RELEASE_GUIDELINES.md b/RELEASE_GUIDELINES.md
index c725ec86fd0fb5f8019da955bbe5999ff47afe25..570ed0ee9b05610ebcebc539b018a48219a1c682 100644
--- a/RELEASE_GUIDELINES.md
+++ b/RELEASE_GUIDELINES.md
@@ -41,4 +41,7 @@ guidelines of the CaosDB Project
 9. Release cppinttests with updated cpplib version
 
 10. Merge `main` back into `dev` and increase patch version by one to begin next
-    release cycle. Do the same in cppintest.
+    release cycle.
+    * update `conanfile.py`
+    * update `CMakeLists.txt`
+    * Don't forget to update cppintest.
diff --git a/conanfile.py b/conanfile.py
index 156bd99fee0a9fb695487edc1ffc8c785f5717b2..5d1c5f4518df4ecc571bf66336a9ac4c8f27e4b1 100644
--- a/conanfile.py
+++ b/conanfile.py
@@ -3,7 +3,7 @@ from conans import ConanFile, CMake, tools
 
 class CaosdbConan(ConanFile):
     name = "caosdb"
-    version = "0.2.0"
+    version = "0.3.0-dev"
     license = "AGPL-3.0-or-later"
     author = "Timm C. Fitschen <t.fitschen@indiscale.com>"
     url = "https://gitlab.indiscale.com/caosdb/src/caosdb-cpplib.git"