diff --git a/firefox.spec b/firefox.spec
index c25dbd1..2d2abe7 100644
--- a/firefox.spec
+++ b/firefox.spec
@@ -99,7 +99,7 @@ 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}-20170802.tar.xz
+Source1:        firefox-langpacks-%{version}%{?pre_version}-20170807.tar.xz
 %endif
 Source10:       firefox-mozconfig
 Source12:       firefox-redhat-default-prefs.js