diff --git a/chroot_version_hooks.d/100_emerge_portage b/chroot_version_hooks.d/100_emerge_portage
new file mode 100644
index 0000000..7213be5
--- /dev/null
+++ b/chroot_version_hooks.d/100_emerge_portage
@@ -0,0 +1,6 @@
+# Copyright 2014 The Chromium OS Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+# If users are stuck on a bad version of Portage, update it.
+sudo emerge -u portage