diff --git a/CMakeLists.txt b/CMakeLists.txt
index b632d5f..ff729d5 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -14,8 +14,8 @@ cmake_minimum_required(VERSION 3.2 FATAL_ERROR)
 
 # project name
 project(amqpcpp)
-set (VERSION_MAJOR 3)
-set (VERSION_MINOR 2)
+set (VERSION_MAJOR 4)
+set (VERSION_MINOR 0)
 set (VERSION_PATCH 0)
 set (SO_VERSION ${VERSION_MAJOR}.${VERSION_MINOR})