diff --git a/CMakeLists.txt b/CMakeLists.txt
index 3d787a7b2..c61c5b606 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -6,6 +6,10 @@ cmake_minimum_required(VERSION 3.19)
 # Set the project name
 project (Orbiter VERSION 21.7.24)
 
+set(CMAKE_CXX_STANDARD 20)
+set(CMAKE_CXX_STANDARD_REQUIRED ON)
+set(CMAKE_CXX_EXTENSIONS OFF)
+
 # Allow building targets as external projects
 include(ExternalProject)