diff --git a/bison.spec b/bison.spec
index 327cbaa..0a24d63 100644
--- a/bison.spec
+++ b/bison.spec
@@ -1,5 +1,5 @@
 Name:          bison
-Version:       3.6.3
+Version:       3.6.4
 Release:       1mamba
 Summary:       A GNU general-purpose parser generator
 Group:         Applications/Development
@@ -81,6 +81,9 @@ cat %{name}-runtime.lang %{name}-gnulib.lang >> %{name}.lang
 # ChangeLog NEWS README THANKS TODO
 
 %changelog
+* Tue Jun 16 2020 Automatic Build System <autodist@mambasoft.it> 3.6.4-1mamba
+- automatic version update by autodist
+
 * Wed Jun 03 2020 Automatic Build System <autodist@mambasoft.it> 3.6.3-1mamba
 - automatic version update by autodist