diff --git a/thunderbird.spec b/thunderbird.spec
index 4a68531..2e86f75 100644
--- a/thunderbird.spec
+++ b/thunderbird.spec
@@ -9,7 +9,7 @@
 #%define        source_dir                  comm-esr%(echo %version | cut -d. -f1)
 
 Name:          thunderbird
-Version:       91.5.1
+Version:       91.6.1
 Release:       1mamba
 Summary:       Mozilla Thunderbird email, RSS, and newsgroup client
 Group:         Graphical Desktop/Applications/Internet
@@ -30,7 +30,7 @@ Patch16:       thunderbird-91.4.1-python-setuptools-60.0.4.patch
 Patch17:       thunderbird-91.5.1-libwayland-1.20.0.patch
 License:       GPL,MPL 1.1,LGPL
 ## AUTOBUILDREQ-BEGIN
-BuildRequires: xulrunner-devel
+BuildRequires: firefox-devel
 BuildRequires: glibc-devel
 BuildRequires: libX11-devel
 BuildRequires: libXcomposite-devel
@@ -209,7 +209,7 @@ This package contains the %{2} language support files for Thunderbird.\
 #%patch14 -p1
 #%patch15 -p1
 %patch16 -p1
-%patch17 -p1 -b .libwayland-1.20.0
+#%patch17 -p1 -b .libwayland-1.20.0
 
 rm -f .mozconfig
 cat << EOF > .mozconfig
@@ -448,6 +448,9 @@ fi
 %{tbdir}/removed-files
 
 %changelog
+* Thu Feb 24 2022 Automatic Build System <autodist@mambasoft.it> 91.6.1-1mamba
+- automatic version update by autodist
+
 * Thu Feb 03 2022 Automatic Build System <autodist@mambasoft.it> 91.5.1-1mamba
 - automatic version update by autodist