diff --git a/src/luxcore/CMakeLists.txt b/src/luxcore/CMakeLists.txt
index 78e680aba..02577b60d 100644
--- a/src/luxcore/CMakeLists.txt
+++ b/src/luxcore/CMakeLists.txt
@@ -27,7 +27,7 @@
 ################################################################################
 
 set(LUXCORE_VERSION_MAJOR 2)
-set(LUXCORE_VERSION_MINOR 4alpha0)
+set(LUXCORE_VERSION_MINOR 4beta1)
 
 # Configure a header file to pass some of the CMake settings
 # to the source code:
diff --git a/src/luxrays/CMakeLists.txt b/src/luxrays/CMakeLists.txt
index 4693ddb7f..d3df8d684 100644
--- a/src/luxrays/CMakeLists.txt
+++ b/src/luxrays/CMakeLists.txt
@@ -27,7 +27,7 @@
 ################################################################################
 
 set(LUXRAYS_VERSION_MAJOR 2)
-set(LUXRAYS_VERSION_MINOR 4alpha0)
+set(LUXRAYS_VERSION_MINOR 4beta1)
 
 # Configure a header file to pass some of the CMake settings
 # to the source code: