diff --git a/CMakeLists.txt b/CMakeLists.txt
index b6196bb..60c0681 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -1,5 +1,5 @@
 cmake_minimum_required(VERSION 3.12)
-project(detdataformats VERSION 3.3.3)
+project(detdataformats VERSION 3.4.0)
 
 find_package(daq-cmake REQUIRED)
 find_package(Boost COMPONENTS unit_test_framework REQUIRED)