diff --git a/CMakeLists.txt b/CMakeLists.txt
index 39d1bdf0a2624c404d7dc029e9e163f061de427c..f662741a5b4b1944dfcabbf20ac830201b9294fb 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -20,7 +20,7 @@
 
 cmake_minimum_required(VERSION 3.13)
 
-set(CAOSDB_PROTO_VERSION 0.3.0)
+set(CAOSDB_PROTO_VERSION 0.3.1)
 
 project("caosdb-proto"
     VERSION ${CAOSDB_PROTO_VERSION}