diff --git a/imath.spec b/imath.spec
index b5b9796..c746870 100644
--- a/imath.spec
+++ b/imath.spec
@@ -1,5 +1,5 @@
 Name:          imath
-Version:       3.1.2
+Version:       3.1.3
 Release:       1mamba
 Summary:       A C++ and python library of 2D and 3D vector, matrix, and math operations for computer graphics
 Group:         System/Libraries
@@ -73,6 +73,9 @@ This package contains libraries and header files for developing applications tha
 %doc README.md
 
 %changelog
+* Fri Sep 03 2021 Automatic Build System <autodist@mambasoft.it> 3.1.3-1mamba
+- automatic version update by autodist
+
 * Sun Aug 01 2021 Automatic Build System <autodist@mambasoft.it> 3.1.2-1mamba
 - automatic version update by autodist