diff --git a/CMakeLists.txt b/CMakeLists.txt
index f2ee0c2a..6d52f9c2 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -20,8 +20,8 @@ include(CTest)
 
 set(OSTAP_VERSION_MAJOR 1)
 set(OSTAP_VERSION_MINOR 9)
-set(OSTAP_VERSION_PATCH 3)
-set(OSTAP_VERSION_TWEAK 9)
+set(OSTAP_VERSION_PATCH 4)
+set(OSTAP_VERSION_TWEAK 0)
 
 set(OSTAP_VERSION ${OSTAP_VERSION_MAJOR}.${OSTAP_VERSION_MINOR}.${OSTAP_VERSION_PATCH}.${OSTAP_VERSION_TWEAK})
 
diff --git a/ReleaseNotes/release_notes.md b/ReleaseNotes/release_notes.md
index 56e56dbc..6305fb6b 100644
--- a/ReleaseNotes/release_notes.md
+++ b/ReleaseNotes/release_notes.md
@@ -1,3 +1,5 @@
+# v1.9.4.0
+
 ## New features: 
 
  1. Add `Ostap::Math::FlatteBugg` , `Ostap::Models::FlatteBugg` and `FlatteBugg_pdf` 
diff --git a/ReleaseNotes/v1.9.4.0.md b/ReleaseNotes/v1.9.4.0.md
new file mode 100644
index 00000000..e07af4aa
--- /dev/null
+++ b/ReleaseNotes/v1.9.4.0.md
@@ -0,0 +1,23 @@
+# v1.9.4.0
+
+## New features: 
+
+ 1. Add `Ostap::Math::FlatteBugg` , `Ostap::Models::FlatteBugg` and `FlatteBugg_pdf` 
+ 1. add addition for two `ROOT.RooPlot~ objects with the same structure 
+ 1. more tuning for `Ostap::Utils::FitResult` 
+ 1. add `ROOT.TTree.fstatVar` and `ROOT.TTree.fstatVars` methods 
+ 1. extend `test_tools_tmva.py` to include all 5 ways to use TMVA results 
+ 1. add `counters_table` fnuction to printing the counters as a table
+ 1. fix/impove issue with standard TMVA plots 
+ 1. update TMVA examples/tests 
+ 1. add `full_path` mehtods for `ROOT.TDirectory` and `ROOT.TTree`
+ 1. improve `addTMVAresponce` functons 
+ 1. rmeove comma separator sfrom `ds_project`
+ 1. slightly improve the prints from `tree_reduce`
+ 
+
+## Backward incompatible:  
+
+## Bug fixes:
+
+ 1. fix formfactor for `Ostap::Math::ChannelFlatteBugg`