diff --git a/thunderbird-91.4.1-python-setuptools-60.0.4.patch b/thunderbird-91.4.1-python-setuptools-60.0.4.patch
new file mode 100644
index 0000000..817fa8f
--- /dev/null
+++ b/thunderbird-91.4.1-python-setuptools-60.0.4.patch
@@ -0,0 +1,10 @@
+--- thunderbird-91.4.1/mach.orig	2021-12-23 10:55:38.758897708 +0100
++++ thunderbird-91.4.1/mach	2021-12-23 10:55:46.712045948 +0100
+@@ -124,6 +124,7 @@
+ 
+ import os
+ import sys
++import setuptools
+ 
+ def load_mach(dir_path, mach_path):
+     if sys.version_info < (3, 5):
diff --git a/thunderbird.spec b/thunderbird.spec
index 36acea1..f2db4ad 100644
--- a/thunderbird.spec
+++ b/thunderbird.spec
@@ -9,7 +9,7 @@
 #%define        source_dir                  comm-esr%(echo %version | cut -d. -f1)
 
 Name:          thunderbird
-Version:       91.4.0
+Version:       91.4.1
 Release:       1mamba
 Summary:       Mozilla Thunderbird email, RSS, and newsgroup client
 Group:         Graphical Desktop/Applications/Internet
@@ -26,9 +26,10 @@ Source5:       thunderbird-autoupdate
 Source6:       thunderbird-distribution.ini
 Patch14:       thunderbird-78.8.1-rust-1.48.patch
 Patch15:       thunderbird-78.8.1-fix-passing-system-bzip2-ldflags.patch
+Patch16:       thunderbird-91.4.1-python-setuptools-60.0.4.patch
 License:       GPL,MPL 1.1,LGPL
 ## AUTOBUILDREQ-BEGIN
-BuildRequires: firefox-devel
+BuildRequires: xulrunner-devel
 BuildRequires: glibc-devel
 BuildRequires: libX11-devel
 BuildRequires: libXcomposite-devel
@@ -206,6 +207,7 @@ This package contains the %{2} language support files for Thunderbird.\
 
 #%patch14 -p1
 #%patch15 -p1
+%patch16 -p1
 
 rm -f .mozconfig
 cat << EOF > .mozconfig
@@ -444,6 +446,9 @@ fi
 %{tbdir}/removed-files
 
 %changelog
+* Tue Dec 21 2021 Automatic Build System <autodist@mambasoft.it> 91.4.1-1mamba
+- automatic version update by autodist
+
 * Wed Dec 08 2021 Automatic Build System <autodist@mambasoft.it> 91.4.0-1mamba
 - automatic version update by autodist