diff --git a/.gitignore b/.gitignore
index 114f12d..e35827a 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,5 +1,5 @@
 SOURCES/cbindgen-vendor.tar.xz
 SOURCES/nspr-4.32.0-1.el8_1.src.rpm
 SOURCES/nss-3.67.0-7.el8_1.src.rpm
-SOURCES/thunderbird-91.4.0.processed-source.tar.xz
-SOURCES/thunderbird-langpacks-91.4.0-20211206.tar.xz
+SOURCES/thunderbird-91.5.0.processed-source.tar.xz
+SOURCES/thunderbird-langpacks-91.5.0-20220107.tar.xz
diff --git a/.thunderbird.metadata b/.thunderbird.metadata
index 4f4bb2b..df739f9 100644
--- a/.thunderbird.metadata
+++ b/.thunderbird.metadata
@@ -1,5 +1,5 @@
 c822547dbc12e2baebdfdfb38b665e23f0c2513a SOURCES/cbindgen-vendor.tar.xz
 b5fd1332d8e0d37339ae170c7bebcb63a40b22e0 SOURCES/nspr-4.32.0-1.el8_1.src.rpm
 8fff814901e03c2518ede2f8992d898f5ba61ed9 SOURCES/nss-3.67.0-7.el8_1.src.rpm
-b547aff4246db7d2c7c6e9ff0f0be49ead13bfdb SOURCES/thunderbird-91.4.0.processed-source.tar.xz
-3d730091ab572437549ce4271b407c39b3289045 SOURCES/thunderbird-langpacks-91.4.0-20211206.tar.xz
+96483930beccc90117f19d77eb57f982aad086ea SOURCES/thunderbird-91.5.0.processed-source.tar.xz
+db0eadc8a9ece29e56420ad74faf0df3545acbe8 SOURCES/thunderbird-langpacks-91.5.0-20220107.tar.xz
diff --git a/README.debrand b/README.debrand
deleted file mode 100644
index 01c46d2..0000000
--- a/README.debrand
+++ /dev/null
@@ -1,2 +0,0 @@
-Warning: This package was configured for automatic debranding, but the changes
-failed to apply.
diff --git a/SOURCES/thunderbird-centos-default-prefs.js.el7 b/SOURCES/thunderbird-centos-default-prefs.js.el7
deleted file mode 100644
index c27d9d3..0000000
--- a/SOURCES/thunderbird-centos-default-prefs.js.el7
+++ /dev/null
@@ -1,36 +0,0 @@
-pref("app.update.enabled", false);
-pref("app.update.autoInstallEnabled", false);
-/* Allow users to set custom colors*/
-/* pref("browser.display.use_system_colors",   true);*/
-pref("general.useragent.vendor", "CentOS");
-pref("general.useragent.vendorSub", "THUNDERBIRD_RPM_VR");
-pref("intl.locale.matchOS", true);
-pref("mail.shell.checkDefaultClient", false);
-pref("toolkit.networkmanager.disable", false);
-pref("offline.autoDetect", true);
-
-/* Disable global indexing by default*/
-pref("mailnews.database.global.indexer.enabled", false);
-
-/* Do not switch to Smart Folders after upgrade to 3.0b4 */
-pref("mail.folder.views.version", "1");
-pref("extensions.shownSelectionUI", true);
-pref("extensions.autoDisableScopes", 0);
-
-/* For rhbz#1024232 */
-pref("ui.SpellCheckerUnderlineStyle",       1);
-
-/* Workaround for rhbz#1753011 */
-pref("spellchecker.dictionary_path", "/usr/share/myspell");
-/* Workaround for rhbz#1134876 */
-pref("javascript.options.baselinejit",      false);
-/* Workaround for rhbz#1110291 */
-pref("network.negotiate-auth.allow-insecure-ntlm-v1", true);
-/* Workaround for mozbz#1063315 */
-pref("security.use_mozillapkix_verification", false);
-/* Use OS settings for UI language */
-pref("intl.locale.requested", "");
-/* Disable telemetry */
-pref("datareporting.healthreport.uploadEnabled", false);
-pref("datareporting.policy.dataSubmissionEnabled", false);
-pref("toolkit.telemetry.archive.enabled", false);
diff --git a/SPECS/thunderbird.spec b/SPECS/thunderbird.spec
index 6819826..ad3bb42 100644
--- a/SPECS/thunderbird.spec
+++ b/SPECS/thunderbird.spec
@@ -128,8 +128,8 @@ end}
 %global build_langpacks         1
 Summary:        Mozilla Thunderbird mail/newsgroup client
 Name:           thunderbird
-Version:        91.4.0
-Release:        2%{?dist}
+Version:        91.5.0
+Release:        1%{?dist}
 URL:            http://www.mozilla.org/projects/thunderbird/
 License:        MPLv1.1 or GPLv2+ or LGPLv2+
 Group:          Applications/Internet
@@ -138,10 +138,14 @@ Group:          Applications/Internet
 ExcludeArch:    %{ix86}
 %endif
 %if 0%{?rhel} == 8
+  %if %{rhel_minor_version} == 1
+ExcludeArch:    %{ix86} aarch64 s390x
+  %else
 ExcludeArch:    %{ix86}
+  %endif
 %endif
 %if 0%{?rhel} == 7
-ExcludeArch:    s390 ppc
+ExcludeArch:    aarch64 s390 ppc
 %endif
 
 # We can't use the official tarball as it contains some test files that use
@@ -151,7 +155,7 @@ ExcludeArch:    s390 ppc
 # Link to official tarball: https://archive.mozilla.org/pub/thunderbird/releases/%%{version}%%{?pre_version}/source/thunderbird-%%{version}%%{?pre_version}.source.tar.xz
 Source0:        thunderbird-%{version}%{?pre_version}.processed-source.tar.xz
 %if %{build_langpacks}
-Source1:        thunderbird-langpacks-%{version}%{?ext_version}-20211206.tar.xz
+Source1:        thunderbird-langpacks-%{version}%{?ext_version}-20220107.tar.xz
 %endif
 Source2:        cbindgen-vendor.tar.xz
 Source3:        get-calendar-langpacks.sh
@@ -163,7 +167,7 @@ Source21:       thunderbird.sh.in
 Source24:       mozilla-api-key
 Source27:       google-api-key
 Source28:       node-stdout-nonblocking-wrapper
-Source701:      thunderbird-centos-default-prefs.js.el7
+Source701:      thunderbird-redhat-default-prefs.js.rhel7
 
 Source403:      nss-3.67.0-7.el8_1.src.rpm
 Source401:      nss-setup-flags-env.inc
@@ -630,7 +634,7 @@ function build_bundled_package() {
   echo $PKG_CONFIG_PATH
 
   rpm -ivh %{SOURCE403}
-  rpmbuild --nodeps --define '_prefix %{bundled_install_path}' -ba %{_specdir}/nss.spec
+  rpmbuild --nodeps --define '_prefix %{bundled_install_path}' --without=tests -ba %{_specdir}/nss.spec
   pushd %{_buildrootdir}
   #cleanup
   #rm -rf {_buildrootdir}/usr/lib/debug/*
@@ -1151,8 +1155,8 @@ gtk-update-icon-cache %{_datadir}/icons/hicolor &>/dev/null || :
 #===============================================================================
 
 %changelog
-* Thu Dec 09 2021 CentOS Sources <bugs@centos.org> - 91.4.0-2.el8.centos
-- Apply debranding changes
+* Fri Jan 07 2022 Eike Rathke <erack@redhat.com> - 91.5.0-1
+- Update to 91.5.0 build1
 
 * Mon Dec 06 2021 Eike Rathke <erack@redhat.com> - 91.4.0-2
 - Update to 91.4.0 build2