diff --git a/CMakeLists.txt b/CMakeLists.txt
index 1bee1be..9a40fad 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -1,5 +1,5 @@
 cmake_minimum_required(VERSION 3.0)
-set(CFLTK_PROJECT_VERSION 1.4.20)
+set(CFLTK_PROJECT_VERSION 1.4.21)
 
 project(cfltk 
     HOMEPAGE_URL https://github.com/MoAlyousef/cfltk