diff --git a/src/CMakeLists.txt b/src/CMakeLists.txt
index 78c86cd7da..d0d79956f0 100644
--- a/src/CMakeLists.txt
+++ b/src/CMakeLists.txt
@@ -3,9 +3,9 @@ if ((${CMAKE_MAJOR_VERSION}.${CMAKE_MINOR_VERSION} GREATER 3.1) OR (${CMAKE_MAJO
   cmake_policy(SET CMP0054 NEW)
 endif()
 project(LEAN CXX C)
-set(LEAN_VERSION_MAJOR 3)
-set(LEAN_VERSION_MINOR 3)
-set(LEAN_VERSION_PATCH 1)
+set(LEAN_VERSION_MAJOR 4)
+set(LEAN_VERSION_MINOR 0)
+set(LEAN_VERSION_PATCH 0)
 set(LEAN_VERSION_IS_RELEASE 0)  # This number is 1 in the release revision, and 0 otherwise.
 set(LEAN_SPECIAL_VERSION_DESC "" CACHE STRING "Additional version description like 'nightly-2018-03-11'")
 set(LEAN_VERSION_STRING "${LEAN_VERSION_MAJOR}.${LEAN_VERSION_MINOR}.${LEAN_VERSION_PATCH}")