diff --git a/libpng12.spec b/libpng12.spec
index 95cec05..577e8a6 100644
--- a/libpng12.spec
+++ b/libpng12.spec
@@ -1,5 +1,5 @@
 Name:          libpng12
-Version:       1.2.56
+Version:       1.2.57
 Release:       1mamba
 Summary:       A library of functions for manipulating PNG image format files
 Group:         System/Libraries
@@ -77,6 +77,9 @@ rm -f %{buildroot}%{_mandir}/man5/png.*
 %doc pngbar.jpg pngbar.png pngnow.png
 
 %changelog
+* Tue Jan 03 2017 Automatic Build System <autodist@mambasoft.it> 1.2.57-1mamba
+- automatic version update by autodist
+
 * Sat Aug 20 2016 Automatic Build System <autodist@mambasoft.it> 1.2.56-1mamba
 - automatic version update by autodist