diff --git a/CMakeLists.txt b/CMakeLists.txt
index 9fb5f2c..072e463 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -2,7 +2,7 @@ cmake_minimum_required(VERSION 3.10)
 
 ######################################################################################################
 # Project Name and Version
-project(libTinyTIFF VERSION 3.1.0.0)
+project(libTinyTIFF VERSION 4.0.0.0)
 
 # set search path for CMake files
 list(APPEND CMAKE_MODULE_PATH ${CMAKE_CURRENT_LIST_DIR}/cmake)