diff --git a/examples/learning_switch/lib/learning_switch/ofctl.ex b/examples/learning_switch/lib/learning_switch/ofctl.ex
index 19c6121..21b123f 100644
--- a/examples/learning_switch/lib/learning_switch/ofctl.ex
+++ b/examples/learning_switch/lib/learning_switch/ofctl.ex
@@ -18,7 +18,6 @@ defmodule LearningSwitch.Ofctl do
   defmodule State do
     defstruct [
       datapath_id: nil,
-      conn_ref:    nil,
       fdb_pid:     nil
     ]
   end
@@ -27,14 +26,12 @@ defmodule LearningSwitch.Ofctl do
     GenServer.start_link(__MODULE__, [datapath_id, args])
   end
 
-  def init([datapath_id, _args]) do
+  def init([{datapath_id, _aux_id}, _args]) do
     :ok = debug("Switch Ready: datapath_id: #{inspect(datapath_id)}")
-    conn_ref = SwitchRegistry.monitor(datapath_id)
     {:ok, pid} = FDB.start_link
     init_datapath(datapath_id)
     state = %State{
       datapath_id: datapath_id,
-      conn_ref:    conn_ref,
       fdb_pid:     pid
     }
     {:ok, state}
@@ -48,8 +45,8 @@ defmodule LearningSwitch.Ofctl do
     :ok = debug("PacketIn: eth_src: #{eth_src} datapath_id: #{inspect(state.datapath_id)}")
     {:noreply, state}
   end
-  def handle_info({:'DOWN', ref, :process, _pid, _reason}, %State{conn_ref: ref} = state) do
-    :ok = debug("Switch Disconnected: datapath_id: #{inspect(state.datapath_id)}")
+  def handle_info({:switch_disconnected, reason}, state) do
+    :ok = warn("[#{__MODULE__}] Switch Disconnected: datapath_id: #{state.datapath_id} by #{reason}")
     {:stop, :normal, state}
   end
   def handle_info(info, state) do
diff --git a/examples/learning_switch/mix.lock b/examples/learning_switch/mix.lock
index 9380bbc..cbc80d1 100644
--- a/examples/learning_switch/mix.lock
+++ b/examples/learning_switch/mix.lock
@@ -1,2 +1,7 @@
-%{"binpp": {:git, "https://github.com/jtendo/binpp.git", "64bd68d215d1a6cd35871e7c134d7fe2e46214ea", [branch: "master"]},
-  "ranch": {:hex, :ranch, "1.4.0", "10272f95da79340fa7e8774ba7930b901713d272905d0012b06ca6d994f8826b", [], [], "hexpm"}}
+%{
+  "binpp": {:git, "https://github.com/jtendo/binpp.git", "64bd68d215d1a6cd35871e7c134d7fe2e46214ea", [branch: "master"]},
+  "eovsdb": {:git, "https://github.com/shun159/eovsdb.git", "1ff1572708d72fd25631c681f2102407903252a3", [branch: "master"]},
+  "jsone": {:git, "https://github.com/sile/jsone.git", "eecc9666c7165e1870b78a7a762549ae8d1c391b", [tag: "1.2.1"]},
+  "ranch": {:hex, :ranch, "1.4.0", "10272f95da79340fa7e8774ba7930b901713d272905d0012b06ca6d994f8826b", [], [], "hexpm"},
+  "uuid": {:git, "https://github.com/avtobiff/erlang-uuid.git", "585c2474afb4a597ae8c8bf6d21e5a9c73f18e0b", [tag: "v0.5.0"]},
+}