diff --git a/vendor/github.com/hashicorp/memberlist/config.go b/vendor/github.com/hashicorp/memberlist/config.go
index 85a93f4228..27a52ea561 100644
--- a/vendor/github.com/hashicorp/memberlist/config.go
+++ b/vendor/github.com/hashicorp/memberlist/config.go
@@ -179,6 +179,11 @@ type Config struct {
 	// behavior for using LogOutput. You cannot specify both LogOutput and Logger
 	// at the same time.
 	Logger *log.Logger
+
+	// Size of Memberlist's internal channel which handles UDP messages. The
+	// size of this determines the size of the queue which Memberlist will keep
+	// while UDP messages are handled.
+	HandoffQueueDepth int
 }
 
 // DefaultLANConfig returns a sane set of configurations for Memberlist.
@@ -216,6 +221,8 @@ func DefaultLANConfig() *Config {
 		Keyring:   nil,
 
 		DNSConfigPath: "/etc/resolv.conf",
+
+		HandoffQueueDepth: 1024,
 	}
 }
 
diff --git a/vendor/github.com/hashicorp/memberlist/memberlist.go b/vendor/github.com/hashicorp/memberlist/memberlist.go
index 7d7e563ef0..7e69676259 100644
--- a/vendor/github.com/hashicorp/memberlist/memberlist.go
+++ b/vendor/github.com/hashicorp/memberlist/memberlist.go
@@ -129,7 +129,7 @@ func newMemberlist(conf *Config) (*Memberlist, error) {
 		leaveBroadcast: make(chan struct{}, 1),
 		udpListener:    udpLn,
 		tcpListener:    tcpLn,
-		handoff:        make(chan msgHandoff, 1024),
+		handoff:        make(chan msgHandoff, conf.HandoffQueueDepth),
 		nodeMap:        make(map[string]*nodeState),
 		nodeTimers:     make(map[string]*suspicion),
 		awareness:      newAwareness(conf.AwarenessMaxMultiplier),
@@ -496,7 +496,7 @@ func (m *Memberlist) SendTo(to net.Addr, msg []byte) error {
 	buf = append(buf, msg...)
 
 	// Send the message
-	return m.rawSendMsgUDP(to, buf)
+	return m.rawSendMsgUDP(to, nil, buf)
 }
 
 // SendToUDP is used to directly send a message to another node, without
@@ -513,7 +513,7 @@ func (m *Memberlist) SendToUDP(to *Node, msg []byte) error {
 
 	// Send the message
 	destAddr := &net.UDPAddr{IP: to.Addr, Port: int(to.Port)}
-	return m.rawSendMsgUDP(destAddr, buf)
+	return m.rawSendMsgUDP(destAddr, to, buf)
 }
 
 // SendToTCP is used to directly send a message to another node, without
diff --git a/vendor/github.com/hashicorp/memberlist/net.go b/vendor/github.com/hashicorp/memberlist/net.go
index 7f66f5d0a4..378adba78c 100644
--- a/vendor/github.com/hashicorp/memberlist/net.go
+++ b/vendor/github.com/hashicorp/memberlist/net.go
@@ -5,6 +5,7 @@ import (
 	"bytes"
 	"encoding/binary"
 	"fmt"
+	"hash/crc32"
 	"io"
 	"net"
 	"time"
@@ -32,7 +33,7 @@ const (
 	// understand version 4 or greater.
 	ProtocolVersion2Compatible = 2
 
-	ProtocolVersionMax = 4
+	ProtocolVersionMax = 5
 )
 
 // messageType is an integer ID of a type of message that can be received
@@ -53,6 +54,7 @@ const (
 	compressMsg
 	encryptMsg
 	nackRespMsg
+	hasCrcMsg
 )
 
 // compressionType is used to specify the compression algorithm
@@ -338,8 +340,18 @@ func (m *Memberlist) ingestPacket(buf []byte, from net.Addr, timestamp time.Time
 		buf = plain
 	}
 
-	// Handle the command
-	m.handleCommand(buf, from, timestamp)
+	// See if there's a checksum included to verify the contents of the message
+	if len(buf) >= 5 && messageType(buf[0]) == hasCrcMsg {
+		crc := crc32.ChecksumIEEE(buf[5:])
+		expected := binary.BigEndian.Uint32(buf[1:5])
+		if crc != expected {
+			m.logger.Printf("[WARN] memberlist: Got invalid checksum for UDP packet: %x, %x", crc, expected)
+			return
+		}
+		m.handleCommand(buf[5:], from, timestamp)
+	} else {
+		m.handleCommand(buf, from, timestamp)
+	}
 }
 
 func (m *Memberlist) handleCommand(buf []byte, from net.Addr, timestamp time.Time) {
@@ -601,7 +613,7 @@ func (m *Memberlist) sendMsg(to net.Addr, msg []byte) error {
 
 	// Fast path if nothing to piggypack
 	if len(extra) == 0 {
-		return m.rawSendMsgUDP(to, msg)
+		return m.rawSendMsgUDP(to, nil, msg)
 	}
 
 	// Join all the messages
@@ -613,11 +625,11 @@ func (m *Memberlist) sendMsg(to net.Addr, msg []byte) error {
 	compound := makeCompoundMessage(msgs)
 
 	// Send the message
-	return m.rawSendMsgUDP(to, compound.Bytes())
+	return m.rawSendMsgUDP(to, nil, compound.Bytes())
 }
 
 // rawSendMsgUDP is used to send a UDP message to another host without modification
-func (m *Memberlist) rawSendMsgUDP(to net.Addr, msg []byte) error {
+func (m *Memberlist) rawSendMsgUDP(addr net.Addr, node *Node, msg []byte) error {
 	// Check if we have compression enabled
 	if m.config.EnableCompression {
 		buf, err := compressPayload(msg)
@@ -631,6 +643,31 @@ func (m *Memberlist) rawSendMsgUDP(to net.Addr, msg []byte) error {
 		}
 	}
 
+	// Try to look up the destination node
+	if node == nil {
+		toAddr, _, err := net.SplitHostPort(addr.String())
+		if err != nil {
+			m.logger.Printf("[ERR] memberlist: Failed to parse address %q: %v", addr.String(), err)
+			return err
+		}
+		m.nodeLock.RLock()
+		nodeState, ok := m.nodeMap[toAddr]
+		m.nodeLock.RUnlock()
+		if ok {
+			node = &nodeState.Node
+		}
+	}
+
+	// Add a CRC to the end of the payload if the recipient understands
+	// ProtocolVersion >= 5
+	if node != nil && node.PMax >= 5 {
+		crc := crc32.ChecksumIEEE(msg)
+		header := make([]byte, 5, 5+len(msg))
+		header[0] = byte(hasCrcMsg)
+		binary.BigEndian.PutUint32(header[1:], crc)
+		msg = append(header, msg...)
+	}
+
 	// Check if we have encryption enabled
 	if m.config.EncryptionEnabled() {
 		// Encrypt the payload
@@ -645,7 +682,7 @@ func (m *Memberlist) rawSendMsgUDP(to net.Addr, msg []byte) error {
 	}
 
 	metrics.IncrCounter([]string{"memberlist", "udp", "sent"}, float32(len(msg)))
-	_, err := m.udpListener.WriteTo(msg, to)
+	_, err := m.udpListener.WriteTo(msg, addr)
 	return err
 }
 
diff --git a/vendor/github.com/hashicorp/memberlist/state.go b/vendor/github.com/hashicorp/memberlist/state.go
index 77871299d7..d5d34e40d7 100644
--- a/vendor/github.com/hashicorp/memberlist/state.go
+++ b/vendor/github.com/hashicorp/memberlist/state.go
@@ -261,7 +261,7 @@ func (m *Memberlist) probeNode(node *nodeState) {
 		}
 
 		compound := makeCompoundMessage(msgs)
-		if err := m.rawSendMsgUDP(destAddr, compound.Bytes()); err != nil {
+		if err := m.rawSendMsgUDP(destAddr, &node.Node, compound.Bytes()); err != nil {
 			m.logger.Printf("[ERR] memberlist: Failed to send compound ping and suspect message to %s: %s", destAddr, err)
 			return
 		}
@@ -484,7 +484,7 @@ func (m *Memberlist) gossip() {
 
 		// Send the compound message
 		destAddr := &net.UDPAddr{IP: node.Addr, Port: int(node.Port)}
-		if err := m.rawSendMsgUDP(destAddr, compound.Bytes()); err != nil {
+		if err := m.rawSendMsgUDP(destAddr, &node.Node, compound.Bytes()); err != nil {
 			m.logger.Printf("[ERR] memberlist: Failed to send gossip to %s: %s", destAddr, err)
 		}
 	}
diff --git a/vendor/github.com/hashicorp/memberlist/util.go b/vendor/github.com/hashicorp/memberlist/util.go
index 7a59e3b370..c082ec6904 100644
--- a/vendor/github.com/hashicorp/memberlist/util.go
+++ b/vendor/github.com/hashicorp/memberlist/util.go
@@ -327,10 +327,18 @@ func isLoopbackIP(ip_str string) bool {
 	return loopbackBlock.Contains(ip)
 }
 
-// Given a string of the form "host", "host:port", or "[ipv6::address]:port",
+// Given a string of the form "host", "host:port",
+// "ipv6::addr" or "[ipv6::address]:port",
 // return true if the string includes a port.
 func hasPort(s string) bool {
-	return strings.LastIndex(s, ":") > strings.LastIndex(s, "]")
+	last := strings.LastIndex(s, ":")
+	if last == -1 {
+		return false
+	}
+	if s[0] == '[' {
+		return s[last-1] == ']'
+	}
+	return strings.Index(s, ":") == last
 }
 
 // compressPayload takes an opaque input buffer, compresses it
diff --git a/vendor/vendor.json b/vendor/vendor.json
index d3a08ca82a..d4c8b1cec5 100644
--- a/vendor/vendor.json
+++ b/vendor/vendor.json
@@ -528,10 +528,10 @@
 			"revisionTime": "2015-06-09T07:04:31Z"
 		},
 		{
-			"checksumSHA1": "AY1/cRsuWpoJMG0J821TqFo9nDE=",
+			"checksumSHA1": "F2jm1h5jRic/Q0e3UEk4aqzS7k0=",
 			"path": "github.com/hashicorp/memberlist",
-			"revision": "0c5ba075f8520c65572f001331a1a43b756e01d7",
-			"revisionTime": "2016-08-12T18:27:57Z"
+			"revision": "56f5fd70afa73f13bbe529192aeb3dc7bc4bc960",
+			"revisionTime": "2016-12-05T22:01:58Z"
 		},
 		{
 			"checksumSHA1": "qnlqWJYV81ENr61SZk9c65R1mDo=",