diff --git a/CMakeLists.txt b/CMakeLists.txt
index 541b4266..c256724c 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -4,6 +4,8 @@ include(CTest)
 
 set(CMAKE_CXX_STANDARD 20)
 set(CXX_STANDARD_REQUIRED ON)
+set(CMAKE_POLICY_DEFAULT_CMP0063 NEW) # Set CMAKE visibility policy to NEW on project and subprojects
+set(CMAKE_CXX_VISIBILITY_PRESET hidden) # Set C++ symbol visibility to default to hidden
 set(CMAKE_MODULE_PATH "${CMAKE_SOURCE_DIR}/cmake")
 
 # Read variables from file