diff --git a/CMakeLists.txt b/CMakeLists.txt
index 724c75662571cdba7e125bef0cfe5039384b621a..41f2c5e5bbecc848e5f00eb125757ccd8bd2e211 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -17,7 +17,7 @@ if(STANDALONE AND NOT DEFINED CMAKE_TOOLCHAIN_FILE AND DEFINED ENV{CMAKE_TOOLCHA
   set(CMAKE_TOOLCHAIN_FILE $ENV{CMAKE_TOOLCHAIN_FILE})
 endif()
 
-project(Allen VERSION 6.11
+project(Allen VERSION 6.12
         LANGUAGES C CXX)
 
 # ---------------
diff --git a/ReleaseNotes/v6r12.md b/ReleaseNotes/v6r12.md
new file mode 100644
index 0000000000000000000000000000000000000000..82a6fec290618baee9f7f996a156c1048fc5d4e9
--- /dev/null
+++ b/ReleaseNotes/v6r12.md
@@ -0,0 +1,37 @@
+2025-09-09 Allen v6r12
+===
+
+This version uses
+Rec [v38r12](../../../../Rec/-/tags/v38r12),
+Lbcom [v37r12](../../../../Lbcom/-/tags/v37r12),
+LHCb [v57r12](../../../../LHCb/-/tags/v57r12),
+Detector [v3r3p3](../../../../Detector/-/tags/v3r3p3),
+Gaudi [v40r0](../../../../Gaudi/-/tags/v40r0) and
+LCG [106c](http://lcginfo.cern.ch/release/106c/) with ROOT 6.32.10.
+
+This version is released on the `2025-patches` branch.
+Built relative to Allen [v6r11](/../../tags/v6r11), with the following changes:
+
+### New features ~"new feature"
+
+
+
+### Fixes ~"bug fix" ~workaround
+
+
+
+### Enhancements ~enhancement
+
+
+
+### Code cleanups and changes to tests ~modernisation ~cleanup ~testing
+
+
+
+### Documentation ~Documentation
+
+
+### Other
+
+- ~Calo | Add ECAL gamma correction, !2139 (@mveghel)
+- Update References for: Allen!2139 based on lhcb-2025-patches-mr/762, !2140 (@lhcbsoft)