diff --git a/lower-constraints.txt b/lower-constraints.txt
index 3313b71a..52a68d42 100644
--- a/lower-constraints.txt
+++ b/lower-constraints.txt
@@ -44,7 +44,7 @@ Mako==0.4.0
 MarkupSafe==1.1.1
 monotonic==0.6
 mox3==0.20.0
-msgpack==0.5.0
+msgpack==1.0.0
 munch==2.1.0
 netaddr==0.7.18
 netifaces==0.10.4
diff --git a/os_ken/lib/rpc.py b/os_ken/lib/rpc.py
index 7db0ebeb..d0691d63 100644
--- a/os_ken/lib/rpc.py
+++ b/os_ken/lib/rpc.py
@@ -40,8 +40,8 @@ class MessageEncoder(object):
 
     def __init__(self):
         super(MessageEncoder, self).__init__()
-        self._packer = msgpack.Packer(encoding='utf-8', use_bin_type=True)
-        self._unpacker = msgpack.Unpacker(encoding='utf-8')
+        self._packer = msgpack.Packer(use_bin_type=True)
+        self._unpacker = msgpack.Unpacker(strict_map_key=False)
         self._next_msgid = 0
 
     def _create_msgid(self):
diff --git a/os_ken/services/protocols/bgp/net_ctrl.py b/os_ken/services/protocols/bgp/net_ctrl.py
index 96e06646..154dad6b 100644
--- a/os_ken/services/protocols/bgp/net_ctrl.py
+++ b/os_ken/services/protocols/bgp/net_ctrl.py
@@ -101,8 +101,8 @@ class RpcSession(Activity):
     def __init__(self, sock, outgoing_msg_sink_iter):
         self.peer_name = str(sock.getpeername())
         super(RpcSession, self).__init__(self.NAME_FMT % self.peer_name)
-        self._packer = msgpack.Packer(encoding='utf-8')
-        self._unpacker = msgpack.Unpacker(encoding='utf-8')
+        self._packer = msgpack.Packer()
+        self._unpacker = msgpack.Unpacker(strict_map_key=False)
         self._next_msgid = 0
         self._socket = sock
         self._outgoing_msg_sink_iter = outgoing_msg_sink_iter
diff --git a/requirements.txt b/requirements.txt
index e1f54929..4b4de591 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -4,7 +4,7 @@
 
 pbr>=2.0.0 # Apache-2.0
 eventlet>=0.22.0,!=0.23.0 # MIT
-msgpack>=0.5.0  # RPC library, BGP speaker(net_cntl)
+msgpack>=1.0.0  # RPC library, BGP speaker(net_cntl)
 netaddr>=0.7.18 # BSD
 oslo.config>=5.1.0
 ovs>=2.8.0  # OVSDB
diff --git a/tools/pip-requires b/tools/pip-requires
index cf1eb152..fd952ee3 100644
--- a/tools/pip-requires
+++ b/tools/pip-requires
@@ -2,7 +2,7 @@
 # following issue.
 # https://github.com/eventlet/eventlet/issues/401
 eventlet>=0.22.0,!=0.23.0
-msgpack>=0.5.0  # RPC library, BGP speaker(net_cntl)
+msgpack>=1.0.0  # RPC library, BGP speaker(net_cntl)
 netaddr>=0.7.18
 oslo.config>=5.1.0
 ovs>=2.8.0  # OVSDB