diff --git a/bison.spec b/bison.spec
index b1f6f63..a29ac95 100644
--- a/bison.spec
+++ b/bison.spec
@@ -1,5 +1,5 @@
 Name:          bison
-Version:       3.0.5
+Version:       3.1
 Release:       1mamba
 Summary:       A GNU general-purpose parser generator
 Group:         Applications/Development
@@ -79,6 +79,9 @@ cat %{name}-runtime.lang >> %{name}.lang
 # ChangeLog NEWS README THANKS TODO
 
 %changelog
+* Tue Aug 28 2018 Automatic Build System <autodist@mambasoft.it> 3.1-1mamba
+- automatic version update by autodist
+
 * Tue May 29 2018 Automatic Build System <autodist@mambasoft.it> 3.0.5-1mamba
 - automatic version update by autodist