diff --git a/CMakeLists.txt b/CMakeLists.txt
index 695241f1e20ace81d2f0b99e10152dcfa13bf8ea..6712e0b7ab5504c093d27661d9a37561df524fd9 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -5,7 +5,7 @@ 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 v10r3p3
+gaudi_project(Geant4 v103r3
               DATA Geant4Files VERSION v103r1)
 
 # FIXME: hack for compatibility with CMT build
diff --git a/ReleaseNotes/v103r3.md b/ReleaseNotes/v103r3.md
new file mode 100644
index 0000000000000000000000000000000000000000..7adcbccd2bc8bd5f8dda370511001f2e7c01b5d9
--- /dev/null
+++ b/ReleaseNotes/v103r3.md
@@ -0,0 +1,9 @@
+2018-02-07 Geant4 v103r3
+===
+This version uses LCG 91 (Gaudi v29r0) and Geant4Files v103r1.
+
+This version is released on `Sim10` branch.
+
+This is the first LCHb release of Geant4 10, supports CMake, CMT support has been dropped.
+
+LHCb PhysLists and Tests have been extracted from the Geant4-src LHCb patches and now reside as separate packages under LHCbG4PhysLists and LHCbG4Tests.