diff --git a/rbm.conf b/rbm.conf
index e1b227a..474b38a 100644
--- a/rbm.conf
+++ b/rbm.conf
@@ -349,6 +349,8 @@ runc:
     EOF
     [% IF c("var/container/disable_network/" _ c("exec_name")) -%]
       sudo ip netns add 'rbm-[% sha256(c("build_id", { error_if_undef => 1 })) %]'
+      # make sure the lo interface is up (see bug 31293)
+      sudo ip netns exec 'rbm-[% sha256(c("build_id", { error_if_undef => 1 })) %]' ip link set lo up
     [% END -%]
     sudo runc [% IF c("var_p/runc100") %]run[% ELSE %]start[% END %] -b '[% c("var/container/dir") %]' rbm-[% sha256(c("build_id", { error_if_undef => 1 })) %] [% IF c("runc_hide_stderr") %]2>/dev/null[% END %]
     [% IF c("var/container/disable_network/" _ c("exec_name")) -%]
diff --git a/tor-browser-build b/tor-browser-build
index 9d25316..803d014 160000
--- a/tor-browser-build
+++ b/tor-browser-build
@@ -1 +1 @@
-Subproject commit 9d253167005def507583f90f01f0fc96e2bdbe07
+Subproject commit 803d014ed9be0ff5a2ee253798f3c3e9b0fc1723