diff --git a/.firefox.metadata b/.firefox.metadata
index 96b97d2..19f80b6 100644
--- a/.firefox.metadata
+++ b/.firefox.metadata
@@ -1,5 +1,5 @@
 c822547dbc12e2baebdfdfb38b665e23f0c2513a SOURCES/cbindgen-vendor.tar.xz
-736b0b4313f678de624c0124f61a86893385d110 SOURCES/firefox-91.3.0esr.processed-source.tar.xz
-7b821f5b94cba12efc8a2b86dbd8c7321b453568 SOURCES/firefox-langpacks-91.3.0esr-20211101.tar.xz
+322e0ffb8b442f599b0f5dd695e6f83050b3dc82 SOURCES/firefox-91.4.0esr.processed-source.tar.xz
+74a1b8c9a5f4a96f80af2d3fe542495e3af2423a SOURCES/firefox-langpacks-91.4.0esr-20211201.tar.xz
 b5fd1332d8e0d37339ae170c7bebcb63a40b22e0 SOURCES/nspr-4.32.0-1.el8_1.src.rpm
-29da2158892dc108a7a21fd8411fccf0061481b3 SOURCES/nss-3.67.0-6.el8_1.src.rpm
+8fff814901e03c2518ede2f8992d898f5ba61ed9 SOURCES/nss-3.67.0-7.el8_1.src.rpm
diff --git a/.gitignore b/.gitignore
index 1a94cd1..e79811e 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,5 +1,5 @@
 SOURCES/cbindgen-vendor.tar.xz
-SOURCES/firefox-91.3.0esr.processed-source.tar.xz
-SOURCES/firefox-langpacks-91.3.0esr-20211101.tar.xz
+SOURCES/firefox-91.4.0esr.processed-source.tar.xz
+SOURCES/firefox-langpacks-91.4.0esr-20211201.tar.xz
 SOURCES/nspr-4.32.0-1.el8_1.src.rpm
-SOURCES/nss-3.67.0-6.el8_1.src.rpm
+SOURCES/nss-3.67.0-7.el8_1.src.rpm
diff --git a/SPECS/firefox.spec b/SPECS/firefox.spec
index 7df11ea..4881f9f 100644
--- a/SPECS/firefox.spec
+++ b/SPECS/firefox.spec
@@ -130,7 +130,7 @@ end}
 
 Summary:        Mozilla Firefox Web browser
 Name:           firefox
-Version:        91.3.0
+Version:        91.4.0
 Release:        1%{?dist}
 URL:            https://www.mozilla.org/firefox/
 License:        MPLv1.1 or GPLv2+ or LGPLv2+
@@ -151,7 +151,7 @@ ExcludeArch:    s390 ppc
 # Link to official tarball: https://hg.mozilla.org/releases/mozilla-release/archive/firefox-%%{version}%%{?pre_version}.source.tar.xz
 Source0:        firefox-%{version}%{?pre_version}.processed-source.tar.xz
 %if %{build_langpacks}
-Source1:        firefox-langpacks-%{version}%{?pre_version}-20211101.tar.xz
+Source1:        firefox-langpacks-%{version}%{?pre_version}-20211201.tar.xz
 %endif
 Source2:        cbindgen-vendor.tar.xz
 Source3:        process-official-tarball
@@ -166,7 +166,7 @@ Source26:       distribution.ini
 Source27:       google-api-key
 Source28:       node-stdout-nonblocking-wrapper
 
-Source403:      nss-3.67.0-6.el8_1.src.rpm
+Source403:      nss-3.67.0-7.el8_1.src.rpm
 Source401:      nss-setup-flags-env.inc
 Source402:      nspr-4.32.0-1.el8_1.src.rpm
 
@@ -1103,7 +1103,7 @@ sed -i -e 's|%PREFIX%|%{_prefix}|' %{buildroot}%{mozappdir}/defaults/preferences
   echo 'pref("security.pki.use_modern_crypto_with_pkcs12", true);' >> %{buildroot}%{mozappdir}/defaults/preferences/all-redhat.js
 %endif
 
-%ifarch s390x
+%ifarch s390x ppc64
   echo 'pref("gfx.webrender.force-disabled", true);' >> %{buildroot}%{mozappdir}/defaults/preferences/all-redhat.js
 %endif
 
@@ -1245,6 +1245,9 @@ gtk-update-icon-cache %{_datadir}/icons/hicolor &>/dev/null || :
 #---------------------------------------------------------------------
 
 %changelog
+* Wed Dec 01 2021 Eike Rathke <erack@redhat.com> - 91.4.0-1
+- Update to 91.4.0 build1
+
 * Mon Nov 01 2021 Eike Rathke <erack@redhat.com> - 91.3.0-1
 - Update to 91.3.0 build1