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/SPECS/thunderbird.spec b/SPECS/thunderbird.spec
index 381a27f..433fcdf 100644
--- a/SPECS/thunderbird.spec
+++ b/SPECS/thunderbird.spec
@@ -127,7 +127,7 @@ end}
 %global build_langpacks         1
 Summary:        Mozilla Thunderbird mail/newsgroup client
 Name:           thunderbird
-Version:        91.4.0
+Version:        91.5.0
 Release:        2%{?dist}
 URL:            http://www.mozilla.org/projects/thunderbird/
 License:        MPLv1.1 or GPLv2+ or LGPLv2+
@@ -150,7 +150,7 @@ 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
@@ -478,12 +478,6 @@ echo "ac_add_options --enable-debug" >> .mozconfig
 echo "ac_add_options --disable-optimize" >> .mozconfig
 %else
 %global optimize_flags "-g -O2"
-%ifarch s390x
-%global optimize_flags "-g -O1"
-%endif
-%ifarch ppc64le aarch64
-%global optimize_flags "-g -O2"
-%endif
 %if %{optimize_flags} != "none"
 echo 'ac_add_options --enable-optimize=%{?optimize_flags}' >> .mozconfig
 %else
@@ -1161,8 +1155,11 @@ gtk-update-icon-cache %{_datadir}/icons/hicolor &>/dev/null || :
 #===============================================================================
 
 %changelog
-* Tue Jan 11 2022 CentOS Sources <bugs@centos.org> - 91.4.0-2.el9.centos
-- Apply debranding changes
+* Fri Jan 14 2022 Jan Horak <jhorak@redhat.com> - 91.5.0-2
+- Enabled optimalization for s390x
+
+* 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