diff --git a/src/CMakeLists.txt b/src/CMakeLists.txt
index c481e004fb..9a3d36b251 100644
--- a/src/CMakeLists.txt
+++ b/src/CMakeLists.txt
@@ -8,7 +8,7 @@ endif()
 include(ExternalProject)
 project(LEAN CXX C)
 set(LEAN_VERSION_MAJOR 4 CACHE STRING "")
-set(LEAN_VERSION_MINOR 30 CACHE STRING "")
+set(LEAN_VERSION_MINOR 31 CACHE STRING "")
 set(LEAN_VERSION_PATCH 0 CACHE STRING "")
 set(LEAN_VERSION_IS_RELEASE 0 CACHE STRING "") # 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'")