diff --git a/step.spec b/step.spec
index 1691b7d..b0bdd03 100644
--- a/step.spec
+++ b/step.spec
@@ -1,5 +1,5 @@
 Name:          step
-Version:       17.12.0
+Version:       17.12.1
 Release:       1mamba
 Summary:       Interactive Physical Simulator
 Group:         Graphical Desktop/Applications/Educational
@@ -140,6 +140,9 @@ exit 0
 #ChangeLog README TODO
 
 %changelog
+* Fri Jan 12 2018 Automatic Build System <autodist@mambasoft.it> 17.12.1-1mamba
+- automatic version update by autodist
+
 * Sat Dec 23 2017 Automatic Build System <autodist@mambasoft.it> 17.12.0-1mamba
 - automatic version update by autodist