diff --git a/.gitignore b/.gitignore
index a83e664..37384b6 100644
--- a/.gitignore
+++ b/.gitignore
@@ -146,3 +146,6 @@ thunderbird-langpacks-3.1.2-20100803.tar.bz2
 /thunderbird-45.2.0.source.tar.xz
 /thunderbird-langpacks-45.2.0-20160711.tar.xz
 /l10n-lightning-45.2.0.tar.xz
+/thunderbird-45.3.0.source.tar.xz
+/thunderbird-langpacks-45.3.0-20160901.tar.xz
+/l10n-lightning-45.3.0.tar.xz
diff --git a/sources b/sources
index f3add4a..e4d1b85 100644
--- a/sources
+++ b/sources
@@ -1,3 +1,3 @@
-e46b0d17809d52e6be479a1b77b6445c  thunderbird-45.2.0.source.tar.xz
-23061556ff572d5be14804756081cd06  thunderbird-langpacks-45.2.0-20160711.tar.xz
-7d3f474b3b9d5bf22e0b6a92fdbac01b  l10n-lightning-45.2.0.tar.xz
+3cdb5f1296ab3aabe0351e07b3572a4b  thunderbird-45.3.0.source.tar.xz
+2d1f58c01e0cdf5a09899c4ca0c5212f  thunderbird-langpacks-45.3.0-20160901.tar.xz
+dbc95923d646b0f99eec55b68836d276  l10n-lightning-45.3.0.tar.xz
diff --git a/thunderbird.spec b/thunderbird.spec
index a1bf71f..85377ff 100644
--- a/thunderbird.spec
+++ b/thunderbird.spec
@@ -56,7 +56,7 @@
 # set to the cwd, ie: '.'
 %define objdir       objdir
 %define mozappdir    %{_libdir}/%{name}
-%define tarballdir   thunderbird-45.2.0
+%define tarballdir   thunderbird-45.3.0
 
 %define official_branding 1
 # enable crash reporter only for iX86
@@ -69,14 +69,14 @@
 
 Summary:        Mozilla Thunderbird mail/newsgroup client
 Name:           thunderbird
-Version:        45.2.0
-Release:        2%{?dist}
+Version:        45.3.0
+Release:        1%{?dist}
 URL:            http://www.mozilla.org/projects/thunderbird/
 License:        MPLv1.1 or GPLv2+ or LGPLv2+
 Group:          Applications/Internet
 Source0:        ftp://ftp.mozilla.org/pub/thunderbird/releases/%{version}%{?pre_version}/source/thunderbird-%{version}%{?pre_version}.source.tar.xz
 %if %{build_langpacks}
-Source1:        thunderbird-langpacks-%{version}-20160711.tar.xz
+Source1:        thunderbird-langpacks-%{version}-20160901.tar.xz
 %endif
 # Locales for lightning
 Source2:        l10n-lightning-%{version}.tar.xz
@@ -618,6 +618,9 @@ gtk-update-icon-cache %{_datadir}/icons/hicolor &>/dev/null || :
 #===============================================================================
 
 %changelog
+* Thu Sep  1 2016 Jan Horak <jhorak@redhat.com> - 45.3.0-1
+- Update to 45.3.0
+
 * Fri Jul 22 2016 Tom Callaway <spot@fedoraproject.org> - 45.2.0-2
 - rebuild for libvpx 1.6.0