diff --git a/step.spec b/step.spec
index 4750ea2..3335062 100644
--- a/step.spec
+++ b/step.spec
@@ -1,5 +1,5 @@
 Name:          step
-Version:       16.12.2
+Version:       16.12.3
 Release:       1mamba
 Summary:       Interactive Physical Simulator
 Group:         Graphical Desktop/Applications/Educational
@@ -101,6 +101,9 @@ exit 0
 #ChangeLog README TODO
 
 %changelog
+* Sat Mar 18 2017 Automatic Build System <autodist@mambasoft.it> 16.12.3-1mamba
+- automatic version update by autodist
+
 * Fri Feb 10 2017 Automatic Build System <autodist@mambasoft.it> 16.12.2-1mamba
 - automatic version update by autodist