diff --git a/thunderbird.spec b/thunderbird.spec
index da80e34..b2467f3 100644
--- a/thunderbird.spec
+++ b/thunderbird.spec
@@ -8,7 +8,7 @@
 #%define        source_dir                  comm-esr%(echo %version | cut -d. -f1)
 
 Name:          thunderbird
-Version:       115.3.0
+Version:       115.3.1
 Release:       1mamba
 Summary:       Mozilla Thunderbird email, RSS, and newsgroup client
 Group:         Graphical Desktop/Applications/Internet
@@ -30,7 +30,7 @@ Patch17:       thunderbird-91.5.1-libwayland-1.20.0.patch
 Patch18:       thunderbird-102.3.2-cbindgen-0.24.patch
 License:       GPL,MPL 1.1,LGPL
 ## AUTOBUILDREQ-BEGIN
-BuildRequires: firefox-devel
+BuildRequires: xulrunner-devel
 BuildRequires: glibc-devel
 BuildRequires: libX11-devel
 BuildRequires: libXcomposite-devel
@@ -209,7 +209,7 @@ This package contains the %{2} language support files for Thunderbird.\
 #:<< ___EOF
 
 # Don't clean build at the end
-%global __spec_rmbuild_cmd /bin/true
+#% global __spec_rmbuild_cmd /bin/true
 
 %global __provides_exclude_from ^%{_libdir}/thunderbird/.*$
 %global __requires_exclude ^(libxul\\.so.*|libldap.*\\.so.*|libldif.*\\.so.*|libmoz.*\\.so.*|libprldap.*\\.so.*|librnp\\.so.*)$
@@ -433,6 +433,9 @@ fi
 %exclude %{_libdir}/thunderbird/distribution/extensions/langpack-*@thunderbird.mozilla.org.xpi
 
 %changelog
+* Sun Oct 01 2023 Automatic Build System <autodist@mambasoft.it> 115.3.1-1mamba
+- automatic version update by autodist
+
 * Wed Sep 27 2023 Automatic Build System <autodist@mambasoft.it> 115.3.0-1mamba
 - automatic version update by autodist