diff --git a/.gitignore b/.gitignore
index a29914b..520105e 100644
--- a/.gitignore
+++ b/.gitignore
@@ -8,3 +8,7 @@
 /thunderbird-91.3.0.processed-source.tar.xz
 /thunderbird-langpacks-91.3.0-20211101.tar.xz
 /thunderbird-langpacks-91.3.0-20211102.tar.xz
+/thunderbird-91.4.0.processed-source.tar.xz
+/thunderbird-langpacks-91.4.0-20211201.tar.xz
+/nss-3.67.0-7.el8_1.src.rpm
+/thunderbird-langpacks-91.4.0-20211206.tar.xz
diff --git a/sources b/sources
index 9f02f96..9acb402 100644
--- a/sources
+++ b/sources
@@ -1,5 +1,5 @@
 SHA512 (cbindgen-vendor.tar.xz) = 9cb4a590584c53386a14deb1f1faf7b67ff8f312eff4a8dccab710738183c504387d69fa660021b495ed61603f4df1db689f35234c61e2e886962e40aab20c95
-SHA512 (nss-3.67.0-6.el8_1.src.rpm) = 6697fef5517c8c1d8c881243d60e35494fb6c11537467a38ce281d49fade5780764e81f5c044fe11dd020bc6c5655b77e65105c677a7812718cbc42061b3b5da
+SHA512 (nss-3.67.0-7.el8_1.src.rpm) = 15361c596fc4f2e4afc7d40d48c37886cad93849821d2bcad8213f34035a6951be127b436b6799083f2b4adb18a68870dbe273177d2d670eda9cc9680e6d6f63
 SHA512 (nspr-4.32.0-1.el8_1.src.rpm) = c181a19bc24aeb62aed1745a6a43ae8aa2ee0d903aa16cb6ec7d385286e60f6426049cc9669459434377a215f329502ffe6fc48a1edc52d5b3283ebc259e9dca
-SHA512 (thunderbird-91.3.0.processed-source.tar.xz) = 8b89c58d5c70fd51d06232e1ee20b5826f5990e0d73bd07466ee9f9e11daca0fdd2542af2f740e77972215182c9b166ad5cf0029bf7ca108e1fb5949e5acf9d0
-SHA512 (thunderbird-langpacks-91.3.0-20211102.tar.xz) = b73b838ad91204bf11d1657494aab708a9a753778839e099ed621cec6f6fa79051d9f863ff0d619bd2b7f328b34ffc441b7fada50be68bf81585ec866450c0fc
+SHA512 (thunderbird-91.4.0.processed-source.tar.xz) = 0a042358652cb35690e28225a85852869186593c427f62ab88603f89100527120a03412266e6bd6020146de0dc0ef1f3d5cebf9e2307010def67d4e94be99582
+SHA512 (thunderbird-langpacks-91.4.0-20211206.tar.xz) = af940a428ffb231c0704d4f29434c33c90211e7a35c7c8b9640070949deffddbf7d0b3673856de0e94eb3b2cef6d1d672dc7f9772de1326ef7efa66af8a7248b
diff --git a/thunderbird.spec b/thunderbird.spec
index 9c30657..f9b6b8b 100644
--- a/thunderbird.spec
+++ b/thunderbird.spec
@@ -127,7 +127,7 @@ end}
 %global build_langpacks         1
 Summary:        Mozilla Thunderbird mail/newsgroup client
 Name:           thunderbird
-Version:        91.3.0
+Version:        91.4.0
 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}-20211102.tar.xz
+Source1:        thunderbird-langpacks-%{version}%{?ext_version}-20211206.tar.xz
 %endif
 Source2:        cbindgen-vendor.tar.xz
 Source3:        get-calendar-langpacks.sh
@@ -164,7 +164,7 @@ Source27:       google-api-key
 Source28:       node-stdout-nonblocking-wrapper
 Source701:      thunderbird-redhat-default-prefs.js.rhel7
 
-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
 
@@ -1161,8 +1161,14 @@ gtk-update-icon-cache %{_datadir}/icons/hicolor &>/dev/null || :
 #===============================================================================
 
 %changelog
+* Mon Dec 06 2021 Eike Rathke <erack@redhat.com> - 91.4.0-2
+- Update to 91.4.0 build2
+
+* Wed Dec 01 2021 Eike Rathke <erack@redhat.com> - 91.4.0-1
+- Update to 91.4.0 build1
+
 * Tue Nov 02 2021 Eike Rathke <erack@redhat.com> - 91.3.0-2
-- Update to 19.3.0 build2
+- Update to 91.3.0 build2
 
 * Mon Nov 01 2021 Eike Rathke <erack@redhat.com> - 91.3.0-1
 - Update to 91.3.0 build1