diff --git a/CMakeLists.txt b/CMakeLists.txt
index 970b787c7c85290e1192f87e2260bf8541f59952..36efe6aafbc7f16646e47c8daa5bc2f296bc92da 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -16,5 +16,5 @@ find_package(GaudiProject)
 #---------------------------------------------------------------
 
 # Declare project name and version
-gaudi_project(Hlt v24r2
-              USE Phys v20r1)
+gaudi_project(Hlt v24r3p1
+              USE Phys v20r1p1)
diff --git a/ReleaseNotes/v24r3p1.md b/ReleaseNotes/v24r3p1.md
new file mode 100644
index 0000000000000000000000000000000000000000..6220a915fde454481ed8c2a5c059ed55f1986867
--- /dev/null
+++ b/ReleaseNotes/v24r3p1.md
@@ -0,0 +1,21 @@
+2020-12-04 Hlt v24r3p1
+===
+
+This version uses
+Phys [v20r1p1](../../../../Phys/-/tags/v20r1p1),
+Rec [v18r1p4](../../../../Rec/-/tags/v18r1p4),
+Lbcom [v17r0p4](../../../../Lbcom/-/tags/v17r0p4),
+LHCb [v39r0p4](../../../../LHCb/-/tags/v39r0p4),
+Gaudi [v26r3](../../../../Gaudi/-/tags/v26r3) and
+LCG [79](http://lcginfo.cern.ch/release/79/) with ROOT 6.04.02.
+
+This version is released on `hlt2015-patches` branch. It is intended for patches to Moore in 2015 simulation workflows. Builds with gcc49 on slc6.
+Built relative to Hlt [v24r2](../-/tags/v24r2) (note that v24r3 was never released), with the following changes:
+
+### Code cleanups and changes to tests ~modernisation ~cleanup ~testing
+
+- Cleanup for 2015 Moore stack, !635 (@rmatev)
+
+### Documentation ~Documentation
+
+- Add release notes template, taken from latest version from master, !638 (@cattanem)