diff --git a/thunderbird.spec b/thunderbird.spec
index f8878ef..3cf82a6 100644
--- a/thunderbird.spec
+++ b/thunderbird.spec
@@ -8,7 +8,7 @@
 #%define        source_dir                  comm-esr%(echo %version | cut -d. -f1)
 
 Name:          thunderbird
-Version:       115.5.0
+Version:       115.5.1
 Release:       1mamba
 Summary:       Mozilla Thunderbird email, RSS, and newsgroup client
 Group:         Graphical Desktop/Applications/Internet
@@ -429,6 +429,9 @@ fi
 %exclude %{_libdir}/thunderbird/distribution/extensions/langpack-*@thunderbird.mozilla.org.xpi
 
 %changelog
+* Tue Nov 28 2023 Automatic Build System <autodist@mambasoft.it> 115.5.1-1mamba
+- automatic version update by autodist
+
 * Sat Nov 25 2023 Automatic Build System <autodist@mambasoft.it> 115.5.0-1mamba
 - automatic version update by autodist