diff --git a/.gitignore b/.gitignore
index bee3504..a40dbb6 100644
--- a/.gitignore
+++ b/.gitignore
@@ -248,3 +248,4 @@ firefox-3.6.4.source.tar.bz2
 /firefox-langpacks-55.0.3-20170901.tar.xz
 /firefox-56.0.source.tar.xz
 /firefox-langpacks-56.0-20170925.tar.xz
+/firefox-langpacks-56.0-20170927.tar.xz
diff --git a/firefox.spec b/firefox.spec
index d4551ad..110a739 100644
--- a/firefox.spec
+++ b/firefox.spec
@@ -99,13 +99,13 @@
 Summary:        Mozilla Firefox Web browser
 Name:           firefox
 Version:        56.0
-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}-20170925.tar.xz
+Source1:        firefox-langpacks-%{version}%{?pre_version}-20170927.tar.xz
 %endif
 Source10:       firefox-mozconfig
 Source12:       firefox-redhat-default-prefs.js
@@ -206,6 +206,7 @@ BuildRequires:  pkgconfig(icu-i18n)
 BuildRequires:  pkgconfig(gconf-2.0)
 BuildRequires:  yasm
 BuildRequires:  llvm-devel
+BuildRequires:  clang-libs
 
 Requires:       mozilla-filesystem
 Requires:       p11-kit-trust
@@ -864,8 +865,8 @@ gtk-update-icon-cache %{_datadir}/icons/hicolor &>/dev/null || :
 #---------------------------------------------------------------------
 
 %changelog
-* Mon Sep 25 2017 Martin Stransky <stransky@redhat.com> - 56.0-1
-- Update to 56.0 (B4)
+* Mon Sep 25 2017 Martin Stransky <stransky@redhat.com> - 56.0-2
+- Update to 56.0 (B6)
 
 * Fri Sep 15 2017 Martin Stransky <stransky@redhat.com> - 55.0.3-4
 - Added switch to build mozbz#1399611 and disable it now
diff --git a/sources b/sources
index f66c2d2..f078f75 100644
--- a/sources
+++ b/sources
@@ -1,2 +1,2 @@
-SHA512 (firefox-56.0.source.tar.xz) = f187f1c2efa8b6405715780726928812bc330590041cb86cdf62b7aa54dc9a513cb68098aa3f0c0bcd21c006225a68a0a8bb34a4de7ee526059f87e2126ae37d
-SHA512 (firefox-langpacks-56.0-20170925.tar.xz) = 3696b8ac7857fe378dd5f5c77953fa1ebff1e6be1888f4265b2a149d33283572a522f6f57da78837a90818fa121c5eb9c3e314a841652e9c26bc372c526fedad
+SHA512 (firefox-56.0.source.tar.xz) = 3aeb0ff54e10c83894f61734daa4f0801a1bb499d4667adad9c78520e588eae809d0e4d61e9227206466d62c3b453e2ce9ca8198f59f5354cd1b6804c00f0990
+SHA512 (firefox-langpacks-56.0-20170927.tar.xz) = e74d85410891b6faa388d37043d764a6c01a2c83479d9912aa3d0b23684ed66ca639eb3cdb579cafef6c3156b0d774a66987a605e0f9e25c2d4eed967ef7b627