diff --git a/GeoModelTools/CMakeLists.txt b/GeoModelTools/CMakeLists.txt
index c2638f58ed6a6f12f3a187748c7d909028f729a1..1a99297fe6c84d928e36a8303bcc6c20046d2643 100644
--- a/GeoModelTools/CMakeLists.txt
+++ b/GeoModelTools/CMakeLists.txt
@@ -2,6 +2,7 @@
 
 # CMake settings
 cmake_minimum_required(VERSION 3.16...4.0)
+set(CMAKE_CXX_STANDARD 20)
 
 # Dummy call to 'project()', needed to set 'PROJECT_SOURCE_DIR'
 project( "GeoModelTools" )