diff --git a/CMakeLists.txt b/CMakeLists.txt
index 21c153bf..3947ca9f 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -1,7 +1,7 @@
 # - musrfit
 cmake_minimum_required(VERSION 3.17)
 
-project(musrfit VERSION 1.9.8 LANGUAGES C CXX)
+project(musrfit VERSION 1.9.9 LANGUAGES C CXX)
 
 #--- musrfit specific options -------------------------------------------------
 option(nexus "build optional NeXus support. Needed for ISIS" OFF)
diff --git a/ChangeLog b/ChangeLog
index 7c8c59a1..d990f89f 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -12,6 +12,11 @@ or
 
 https://bitbucket.org/muonspin/musrfit/commits/all
 
+Release of V1.9.9, 2025/06/08
+=============================
+
+add THEORY functions for local Gaussian / global Lorentzian, and a simple F-mu-F function.
+
 Release of V1.9.8, 2025/03/24
 =============================