diff --git a/CMakeLists.txt b/CMakeLists.txt
index 17d4afaf2c..2bcdd137de 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -4,7 +4,7 @@ project(casadi C CXX)
 set(CASADI_MAJOR_VERSION 3)
 set(CASADI_MINOR_VERSION 6)
 set(CASADI_PATCH_VERSION 4)
-set(CASADI_IS_RELEASE 0)
+set(CASADI_IS_RELEASE 1)
 
 set(CASADI_VERSION ${CASADI_MAJOR_VERSION}.${CASADI_MINOR_VERSION}.${CASADI_PATCH_VERSION})
 set(CASADI_VERSION_PYTHON ${CASADI_MAJOR_VERSION}.${CASADI_MINOR_VERSION}.${CASADI_PATCH_VERSION})