diff --git a/GaussSys/CMakeLists.txt b/GaussSys/CMakeLists.txt
index f6e0b1686d5b8c9ce02ed9597a55bf8fe0fb3451..81108c7082fdcccb212dad80053ddd2871e76bc1 100644
--- a/GaussSys/CMakeLists.txt
+++ b/GaussSys/CMakeLists.txt
@@ -1,6 +1,6 @@
 ################################################################################
 # Package: GaussSys
 ################################################################################
-gaudi_subdir(GaussSys v52r1)
+gaudi_subdir(GaussSys v52r2)
 
 gaudi_add_test(QMTest QMTEST)
diff --git a/ReleaseNotes/v52r2.md b/ReleaseNotes/v52r2.md
new file mode 100644
index 0000000000000000000000000000000000000000..409e76c11be5791bfc90946ab62fe00fab35f6fd
--- /dev/null
+++ b/ReleaseNotes/v52r2.md
@@ -0,0 +1,41 @@
+
+
+2018-06-24 Gauss v52r2
+===
+
+This version uses LHCb v44r2p1, Geant4 **v104r2**, Gaudi v29r4 and LCG 93 with
+ HepMC 2.06.09 and Root 6.12.06
+
+The generators used via LCG_93/MCGenerators) are
+ pythia8 235 (with LHCb Tune1), lhapdf 6.1.6.cxxstd, photos++ 3.56, 
+ tauola++ 1.1.6b.lhcb, pythia 6.427.2,
+ hijing 1.383bs.2, crmc 1.5.6 (epos), alpgen 2.1.4, powhegbox r3043.lhcb, 
+ herwig++ 2.7.1, thepeg 2.1.1, 
+ rivet 2.6.0, yoda 1.6.7.
+ startlight r300  
+and the internal implementation of:
+ EvtGen with EvtGenExtras, AmpGen, Mint,
+ BcVegPy and GenXicc, SuperChic2, LPair, MIB
+
+The data packages specific for the simulation are 
+Geant4Files v104r* , GDMLData v1r* , XmlVis v2r* , DecFiles v30r* , 
+LHAPDFSets v2r* , BcVegPyData v2r* , GenXiccData v3r* , PGunsData v1r* , 
+MIBData v3r*
+
+
+<p>
+This version is released on `master`. 
+<p>
+It is to be used for productions referred to as **Sim10Dev** and is for tuning, 
+calibration and setting up and cross check in view of Sim10.
+<p>
+The only difference between this version and v52r1 is the more recent version of
+Geant4 *10.4.p02* used.
+
+
+### Monitoring changes and Changes to tests
+
+- Test for Sim10Dev, !314 (@gcorti)   
+  Changed reference tests due to change on patch of Geant4 version to use (10.4.p02)
+
+
diff --git a/Sim/Gauss/CMakeLists.txt b/Sim/Gauss/CMakeLists.txt
index 3a729939eddc0404149fd37aa37348b738516382..c56cd589b604d6a44f8c75541686a44c163d00a7 100644
--- a/Sim/Gauss/CMakeLists.txt
+++ b/Sim/Gauss/CMakeLists.txt
@@ -1,7 +1,7 @@
 ################################################################################
 # Package: Gauss
 ################################################################################
-gaudi_subdir(Gauss v52r1)
+gaudi_subdir(Gauss v52r2)
 
 find_package(HepMC)