diff --git a/antlr.spec b/antlr.spec
index 54799a0..3b4a2fa 100644
--- a/antlr.spec
+++ b/antlr.spec
@@ -1,5 +1,5 @@
 Name:          antlr
-Version:       4.13.0
+Version:       4.13.1
 Release:       1mamba
 Summary:       Parser generator for reading, processing, executing, or translating structured text or binary files
 Group:         Development/Tools
@@ -43,6 +43,9 @@ install -D -m0755 %{SOURCE2} %{buildroot}%{_bindir}/grun
 %{_javadir}/antlr-complete.jar
 
 %changelog
+* Tue Sep 05 2023 Automatic Build System <autodist@mambasoft.it> 4.13.1-1mamba
+- automatic version update by autodist
+
 * Mon May 22 2023 Automatic Build System <autodist@mambasoft.it> 4.13.0-1mamba
 - automatic version update by autodist