diff --git a/geant4.spec b/geant4.spec
index 0b751c4f080..aa9d719de27 100644
--- a/geant4.spec
+++ b/geant4.spec
@@ -1,5 +1,5 @@
-### RPM external geant4 11.3.ref05
-%define tag ea6d086b394e8166b7b0b4cea2ff136a8c7d25f2
+### RPM external geant4 11.3.ref06
+%define tag 39d3f1883fd9e4c289beba508f1da73eda0ba54d
 %define branch cms/v%{realversion}
 %define github_user cms-externals
 Source: git+https://github.com/%github_user/%{n}.git?obj=%{branch}/%{tag}&export=%{n}.%{realversion}&output=/%{n}.%{realversion}-%{tag}.tgz