diff --git a/CMakeLists.txt b/CMakeLists.txt
index 049763b94d0dad370d18a39788e31e076e6c3957..695241f1e20ace81d2f0b99e10152dcfa13bf8ea 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -5,8 +5,8 @@ CMAKE_MINIMUM_REQUIRED(VERSION 2.8.5)
 set(GEANT4_SRCS_REPOSITORY https://gitlab.cern.ch/lhcb/Geant4-srcs.git CACHE STRING "Repository for Geant4 sources")
 
 find_package(GaudiProject)
-gaudi_project(Geant4 v10r3p2
-              DATA Geant4Files VERSION v103r*)
+gaudi_project(Geant4 v10r3p3
+              DATA Geant4Files VERSION v103r1)
 
 # FIXME: hack for compatibility with CMT build
 file(WRITE ${CMAKE_BINARY_DIR}/dummy.cpp "")
diff --git a/Geant4/G4config/CMakeLists.txt b/Geant4/G4config/CMakeLists.txt
index 4a5a847ed4d128ffcc021f6f7742dc7445858cd8..a540a78b5d16acdfe14d0f0c923ea1f75b01b5d0 100644
--- a/Geant4/G4config/CMakeLists.txt
+++ b/Geant4/G4config/CMakeLists.txt
@@ -30,7 +30,7 @@ if (NOT GEANT4_TAG)
   elseif(CMAKE_PROJECT_VERSION STREQUAL "HEAD")
     # Special mapping of version HEAD
     # WARNING this must be kept up to date manually
-    set(GEANT4_TAG "lhcb/v10.3.2-branch")
+    set(GEANT4_TAG "lhcb/v10.3.3-branch")
   else()
     set(GEANT4_TAG lhcb/${CMAKE_PROJECT_VERSION})
   endif()