diff --git a/lib/aptible/api/vpn_tunnel.rb b/lib/aptible/api/vpn_tunnel.rb
index f2b7177..a6955fb 100644
--- a/lib/aptible/api/vpn_tunnel.rb
+++ b/lib/aptible/api/vpn_tunnel.rb
@@ -22,6 +22,7 @@ class VpnTunnel < Resource
       field :key_exchange
       field :auto
       field :dpd_action
+      field :dpd_timeout
       field :status
       field :backend
       field :state