diff --git a/.gitignore b/.gitignore
index eccd3a5..697755d 100644
--- a/.gitignore
+++ b/.gitignore
@@ -341,3 +341,5 @@ thunderbird-langpacks-3.1.2-20100803.tar.bz2
 /thunderbird-langpacks-91.2.0-20211015.tar.xz
 /thunderbird-91.3.0.source.tar.xz
 /thunderbird-langpacks-91.3.0-20211109.tar.xz
+/thunderbird-91.4.0.source.tar.xz
+/thunderbird-langpacks-91.4.0-20211215.tar.xz
diff --git a/sources b/sources
index 612be90..31fba81 100644
--- a/sources
+++ b/sources
@@ -1,3 +1,3 @@
-SHA512 (thunderbird-91.3.0.source.tar.xz) = 938de817ed2cad90f665559da1dfc266f34b6ca2e688ee364112edfdb1167183a8225132ed50b672ceb14402be933be82fd1ef8b46f103cdf1534a403fb472d9
-SHA512 (thunderbird-langpacks-91.3.0-20211109.tar.xz) = d29a14429b385a2356c14cc1f6e4522e5f58127d2e840d067adcc5c9405407cf02a9bf5dd82189cf7cb055e746b4e4dc6124f670f4457ff53768a9b6af514582
-SHA512 (cbindgen-vendor.tar.xz) = 105a7d93d63920d8c232421a29f6330c171343d27807feaeadb1737374e5cf1d48916cb6e9ce04773dd81bb3c52a6f5cef12e633b0922cb9f91ca99acc9e4b78
+SHA512 (thunderbird-91.4.0.source.tar.xz) = f19eba17b8018d11358258f6c9fbe4b2d20858f5afdf82ad5a81de5f6191f833ecf01ee4631297b0880dfa8b76baa1f9cd09a976cab2d2206ca5a902283fa102
+SHA512 (thunderbird-langpacks-91.4.0-20211215.tar.xz) = 2c83ce9f66180ee7a7ea33c909bbc8eb4d5ea7d5c815a517a175ce7c65b48e175be8ffd0af2c72b3944ff88202eb4b27f4e4c330f395a8c1c235319c9aa4e172
+SHA512 (cbindgen-vendor-0.14.3.tar.xz) = 33c8d28547674121f690eea0d3ebac33926a39caacac787bf8ed8b346478822e74da5a4a1f57ab4df4105fa8376739a2ece888845a85bc5712aaed20e4a508bc
diff --git a/thunderbird-wayland.sh.in b/thunderbird-wayland.sh.in
index 028bb50..31d7def 100644
--- a/thunderbird-wayland.sh.in
+++ b/thunderbird-wayland.sh.in
@@ -2,11 +2,5 @@
 #
 # Run Thunderbird under Wayland
 #
-
-##
-## Enable Wayland backend?
-##
-if [ "$XDG_CURRENT_DESKTOP" == "GNOME" ]; then
-  export MOZ_ENABLE_WAYLAND=1
-fi
+export MOZ_ENABLE_WAYLAND=1
 exec __PREFIX__/bin/thunderbird "$@"
diff --git a/thunderbird.spec b/thunderbird.spec
index ce76e0b..0bd30a7 100644
--- a/thunderbird.spec
+++ b/thunderbird.spec
@@ -89,13 +89,13 @@ ExcludeArch: s390x
 
 Summary:        Mozilla Thunderbird mail/newsgroup client
 Name:           thunderbird
-Version:        91.3.0
+Version:        91.4.0
 Release:        1%{?dist}
 URL:            http://www.mozilla.org/projects/thunderbird/
 License:        MPLv1.1 or GPLv2+ or LGPLv2+
 Source0:        https://archive.mozilla.org/pub/thunderbird/releases/%{version}%{?pre_version}/source/thunderbird-%{version}%{?pre_version}.source.tar.xz
 %if %{build_langpacks}
-Source1:        thunderbird-langpacks-%{version}-20211109.tar.xz
+Source1:        thunderbird-langpacks-%{version}-20211215.tar.xz
 %endif
 Source3:        get-calendar-langpacks.sh
 Source4:        cbindgen-vendor.tar.xz
@@ -719,6 +719,10 @@ gtk-update-icon-cache %{_datadir}/icons/hicolor &>/dev/null || :
 #===============================================================================
 
 %changelog
+* Wed Dec 15 2021 Jan Horak <jhorak@redhat.com> - 91.4.0-1
+- Update to 91.4.0 build2
+- Enabled wayland backend for all DE (thanks to Timothée Ravier <travier@redhat.com>)
+
 * Tue Nov 09 2021 Jan Horak <jhorak@redhat.com> - 91.3.0-1
 - Update to 91.3.0 build2