diff --git a/.gitignore b/.gitignore
index ab253d5..b6ec15d 100644
--- a/.gitignore
+++ b/.gitignore
@@ -207,3 +207,4 @@ firefox-3.6.4.source.tar.bz2
 /firefox-49.0.source.tar.xz
 /firefox-langpacks-49.0-20160906.tar.xz
 /firefox-langpacks-49.0-20160908.tar.xz
+/firefox-langpacks-49.0-20160919.tar.xz
diff --git a/firefox.spec b/firefox.spec
index a5fd848..aac0d14 100644
--- a/firefox.spec
+++ b/firefox.spec
@@ -86,13 +86,13 @@
 Summary:        Mozilla Firefox Web browser
 Name:           firefox
 Version:        49.0
-Release:        1%{?pre_tag}%{?dist}
+Release:        2%{?pre_tag}%{?dist}
 URL:            https://www.mozilla.org/firefox/
 License:        MPLv1.1 or GPLv2+ or LGPLv2+
 Group:          Applications/Internet
 Source0:        https://archive.mozilla.org/pub/firefox/releases/%{version}%{?pre_version}/source/firefox-%{version}%{?pre_version}.source.tar.xz
 %if %{build_langpacks}
-Source1:        firefox-langpacks-%{version}%{?pre_version}-20160908.tar.xz
+Source1:        firefox-langpacks-%{version}%{?pre_version}-20160919.tar.xz
 %endif
 Source10:       firefox-mozconfig
 Source12:       firefox-redhat-default-prefs.js
@@ -768,6 +768,9 @@ gtk-update-icon-cache %{_datadir}/icons/hicolor &>/dev/null || :
 #---------------------------------------------------------------------
 
 %changelog
+* Mon Sep 19 2016 Martin Stransky <stransky@redhat.com> - 49.0-2
+- Update to Firefox 49 (B4)
+
 * Tue Sep 6 2016 Martin Stransky <stransky@redhat.com> - 49.0-1
 - Update to Firefox 49
 
diff --git a/sources b/sources
index 63744e0..32c6860 100644
--- a/sources
+++ b/sources
@@ -1,2 +1,2 @@
-57950744a4f5b7bf6cbc39be3d08ee34  firefox-langpacks-49.0-20160908.tar.xz
-f32c3cfaaa3d6aaae4798df2d2749640  firefox-49.0.source.tar.xz
+24f497ae93db299958771ccc93de1a47  firefox-49.0.source.tar.xz
+6356618615adb6555b21eafb3e2e1d59  firefox-langpacks-49.0-20160919.tar.xz