diff --git a/CMakeLists.txt b/CMakeLists.txt
index ecd96dc..7102109 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -26,7 +26,7 @@ else()
     add_compile_options(-Wall -Wextra -pedantic -Werror)
 endif()
 
-set( version 0.3.0 )
+set( version 0.4.0 )
 
 # mainframe ==================================================================