diff --git a/.gitignore b/.gitignore
index 6892217..fef3d90 100644
--- a/.gitignore
+++ b/.gitignore
@@ -14,3 +14,5 @@ firefox-3.6.4.source.tar.bz2
 /firefox-langpacks-4.0b10-20110125.tar.bz2
 /firefox-4.0b11.source.tar.bz2
 /firefox-langpacks-4.0b11-20110208.tar.xz
+/firefox-4.0b12.source.tar.bz2
+/firefox-langpacks-4.0b12-20110225.tar.xz
diff --git a/firefox.spec b/firefox.spec
index dbb418a..b6fd10f 100644
--- a/firefox.spec
+++ b/firefox.spec
@@ -10,8 +10,8 @@
 %define firefox_app_id \{ec8030f7-c20a-464f-9b0e-13a3a9e97384\}
 
 %global firefox_dir_ver 4
-%global gecko_version   2.0-beta11
-%global pre_version     b11
+%global gecko_version   2.0-beta12
+%global pre_version     b12
 %global pre_tag         .%{?pre_version}
 
 %global mozappdir     %{_libdir}/%{name}-%{firefox_dir_ver}
@@ -24,13 +24,13 @@
 Summary:        Mozilla Firefox Web browser
 Name:           firefox
 Version:        4.0
-Release:        0.16%{?pre_tag}%{?dist}
+Release:        0.17%{?pre_tag}%{?dist}
 URL:            http://www.mozilla.org/projects/firefox/
 License:        MPLv1.1 or GPLv2+ or LGPLv2+
 Group:          Applications/Internet
 Source0:        ftp://ftp.mozilla.org/pub/firefox/releases/%{version}%{?pre_version}/source/firefox-%{version}%{?pre_version}.source.tar.bz2
 %if %{build_langpacks}
-Source1:        firefox-langpacks-%{version}%{?pre_version}-20110208.tar.xz
+Source1:        firefox-langpacks-%{version}%{?pre_version}-20110225.tar.xz
 %endif
 Source10:       firefox-mozconfig
 Source11:       firefox-mozconfig-branded
@@ -355,6 +355,9 @@ gtk-update-icon-cache %{_datadir}/icons/hicolor &>/dev/null || :
 #---------------------------------------------------------------------
 
 %changelog
+* Fri Feb 25 2011 Christopher Aillon <caillon@redhat.com> - 4.0-0.17b12
+- Firefox 4.0 Beta 12
+
 * Thu Feb 10 2011 Christopher Aillon <caillon@redhat.com> - 4.0-0.16b11
 - Update gecko-{libs,devel} requires
 
diff --git a/sources b/sources
index 64a932a..01f57c7 100644
--- a/sources
+++ b/sources
@@ -1,2 +1,2 @@
-a52b8f4bb98f158ef0639db59dd39bce  firefox-4.0b11.source.tar.bz2
-a90bc2d90a1a418aae4e11219905c8ea  firefox-langpacks-4.0b11-20110208.tar.xz
+8b343c8f9db97199ddcf9744315c2bbb  firefox-4.0b12.source.tar.bz2
+02878931d2ca254b65424c92f82f58bb  firefox-langpacks-4.0b12-20110225.tar.xz