diff --git a/vendor/golang.org/x/net/netutil/listen.go b/vendor/golang.org/x/net/netutil/listen.go
new file mode 100644
index 000000000..b317ba2e6
--- /dev/null
+++ b/vendor/golang.org/x/net/netutil/listen.go
@@ -0,0 +1,48 @@
+// Copyright 2013 The Go Authors.  All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// Package netutil provides network utility functions, complementing the more
+// common ones in the net package.
+package netutil // import "golang.org/x/net/netutil"
+
+import (
+	"net"
+	"sync"
+)
+
+// LimitListener returns a Listener that accepts at most n simultaneous
+// connections from the provided Listener.
+func LimitListener(l net.Listener, n int) net.Listener {
+	return &limitListener{l, make(chan struct{}, n)}
+}
+
+type limitListener struct {
+	net.Listener
+	sem chan struct{}
+}
+
+func (l *limitListener) acquire() { l.sem <- struct{}{} }
+func (l *limitListener) release() { <-l.sem }
+
+func (l *limitListener) Accept() (net.Conn, error) {
+	l.acquire()
+	c, err := l.Listener.Accept()
+	if err != nil {
+		l.release()
+		return nil, err
+	}
+	return &limitListenerConn{Conn: c, release: l.release}, nil
+}
+
+type limitListenerConn struct {
+	net.Conn
+	releaseOnce sync.Once
+	release     func()
+}
+
+func (l *limitListenerConn) Close() error {
+	err := l.Conn.Close()
+	l.releaseOnce.Do(l.release)
+	return err
+}
diff --git a/vendor/vendor.json b/vendor/vendor.json
index 4afb1fcb7..aae150ab6 100644
--- a/vendor/vendor.json
+++ b/vendor/vendor.json
@@ -695,6 +695,12 @@
 			"revision": "c589d0c9f0d81640c518354c7bcae77d99820aa3",
 			"revisionTime": "2016-09-30T00:14:02Z"
 		},
+		{
+			"checksumSHA1": "7WASrg0PEueWDDRHkFhEEN6Qrms=",
+			"path": "golang.org/x/net/netutil",
+			"revision": "bc3663df0ac92f928d419e31e0d2af22e683a5a2",
+			"revisionTime": "2016-06-21T20:48:10Z"
+		},
 		{
 			"checksumSHA1": "mktBVED98G2vv+OKcSgtnFVZC1Y=",
 			"path": "golang.org/x/oauth2",