diff --git a/kotlin.spec b/kotlin.spec
index b6513a6..25af0aa 100644
--- a/kotlin.spec
+++ b/kotlin.spec
@@ -1,7 +1,7 @@
 %define pkgver %(echo %version | tr _ -)
 Name:          kotlin
-Version:       1.5.30_M1
-Release:       2mamba
+Version:       1.5.31
+Release:       1mamba
 Summary:       Statically typed programming language that can interoperate with Java
 Group:         Applications/Development
 Vendor:        openmamba
@@ -60,6 +60,9 @@ install -D -m0644 build.txt %{buildroot}%{_datadir}/kotlin/build.txt
 %doc license/LICENSE.txt license/COPYRIGHT.txt license/COPYRIGHT_HEADER.txt
 
 %changelog
+* Mon Sep 20 2021 Automatic Build System <autodist@mambasoft.it> 1.5.31-1mamba
+- automatic version update by autodist
+
 * Sat Jul 31 2021 Silvan Calarco <silvan.calarco@mambasoft.it> 1.5.30_M1-2mamba
 - fix executable paths with setconf