diff --git a/.gitignore b/.gitignore
index ba5d6d5..3d6fc59 100644
--- a/.gitignore
+++ b/.gitignore
@@ -333,3 +333,5 @@ thunderbird-langpacks-3.1.2-20100803.tar.bz2
 /thunderbird-langpacks-78.12.0-20210721.tar.xz
 /thunderbird-91.0.2.source.tar.xz
 /thunderbird-langpacks-91.0.2-20210823.tar.xz
+/thunderbird-91.0.3.source.tar.xz
+/thunderbird-langpacks-91.0.3-20210826.tar.xz
diff --git a/sources b/sources
index a6d7ea0..8c72b92 100644
--- a/sources
+++ b/sources
@@ -1,3 +1,3 @@
-SHA512 (thunderbird-91.0.2.source.tar.xz) = 468be2f5024fd32eb22a661ed5f30de5d74231ee736e6743a9fb84e747bf45fceaaf286a5cbb20eb41f8ab98e0c56310eab3d2e6077fd81ee0ef52b28c33a3f2
-SHA512 (thunderbird-langpacks-91.0.2-20210823.tar.xz) = 23f9b1087ef11d79dbee4c906e1c70c1a16abc4f83278f0f30da8b2fdda55d699c98199a0ecccf3298239b68f93e2b8ce4fcbb34f7babfd0c73da63478d16d7c
+SHA512 (thunderbird-91.0.3.source.tar.xz) = 1c7b4c11066ab64ee1baa9f07bc6bd4478c2ece0bcf8ac381c2f0774582bb781b8151b54326cd38742d039c5de718022649d804dfceaf142863249b1edb68e1e
+SHA512 (thunderbird-langpacks-91.0.3-20210826.tar.xz) = 685bd8468d9c6b3ebbc680c69bf2ea96c2cd623a79aaa272d3acbfe3a2a8d77dcc225d09fb5a314cccfd5420361fbc643c662e0eeeb60685438913971c0d92fa
 SHA512 (cbindgen-vendor.tar.xz) = 105a7d93d63920d8c232421a29f6330c171343d27807feaeadb1737374e5cf1d48916cb6e9ce04773dd81bb3c52a6f5cef12e633b0922cb9f91ca99acc9e4b78
diff --git a/thunderbird.spec b/thunderbird.spec
index 2c5d6ed..248d2b9 100644
--- a/thunderbird.spec
+++ b/thunderbird.spec
@@ -89,13 +89,13 @@ ExcludeArch: s390x
 
 Summary:        Mozilla Thunderbird mail/newsgroup client
 Name:           thunderbird
-Version:        91.0.2
+Version:        91.0.3
 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}-20210823.tar.xz
+Source1:        thunderbird-langpacks-%{version}-20210826.tar.xz
 %endif
 Source3:        get-calendar-langpacks.sh
 Source4:        cbindgen-vendor.tar.xz
@@ -766,6 +766,9 @@ gtk-update-icon-cache %{_datadir}/icons/hicolor &>/dev/null || :
 #===============================================================================
 
 %changelog
+* Thu Aug 26 2021 Jan Horak <jhorak@redhat.com> - 91.0.3-1
+- Update to 91.0.3 build1
+
 * Mon Aug 23 2021 Jan Horak <jhorak@redhat.com> - 91.0.2-1
 - Update to 91.0.2 build1