diff --git a/vendor/github.com/go-ldap/ldap/bind.go b/vendor/github.com/go-ldap/ldap/bind.go
index 589a9d80b57c..2be0defddfbf 100644
--- a/vendor/github.com/go-ldap/ldap/bind.go
+++ b/vendor/github.com/go-ldap/ldap/bind.go
@@ -40,7 +40,9 @@ func (bindRequest *SimpleBindRequest) encode() *ber.Packet {
 	request.AppendChild(ber.NewString(ber.ClassUniversal, ber.TypePrimitive, ber.TagOctetString, bindRequest.Username, "User Name"))
 	request.AppendChild(ber.NewString(ber.ClassContext, ber.TypePrimitive, 0, bindRequest.Password, "Password"))
 
-	request.AppendChild(encodeControls(bindRequest.Controls))
+	if len(bindRequest.Controls) > 0 {
+		request.AppendChild(encodeControls(bindRequest.Controls))
+	}
 
 	return request
 }
diff --git a/vendor/github.com/go-ldap/ldap/del.go b/vendor/github.com/go-ldap/ldap/del.go
index 4fd63dc3f25a..685a0ffd84e6 100644
--- a/vendor/github.com/go-ldap/ldap/del.go
+++ b/vendor/github.com/go-ldap/ldap/del.go
@@ -40,7 +40,7 @@ func (l *Conn) Del(delRequest *DelRequest) error {
 	packet := ber.Encode(ber.ClassUniversal, ber.TypeConstructed, ber.TagSequence, nil, "LDAP Request")
 	packet.AppendChild(ber.NewInteger(ber.ClassUniversal, ber.TypePrimitive, ber.TagInteger, l.nextMessageID(), "MessageID"))
 	packet.AppendChild(delRequest.encode())
-	if delRequest.Controls != nil {
+	if len(delRequest.Controls) > 0 {
 		packet.AppendChild(encodeControls(delRequest.Controls))
 	}
 
diff --git a/vendor/github.com/go-ldap/ldap/search.go b/vendor/github.com/go-ldap/ldap/search.go
index 97ae95bf7913..d1f0386f9650 100644
--- a/vendor/github.com/go-ldap/ldap/search.go
+++ b/vendor/github.com/go-ldap/ldap/search.go
@@ -375,7 +375,7 @@ func (l *Conn) Search(searchRequest *SearchRequest) (*SearchResult, error) {
 	}
 	packet.AppendChild(encodedSearchRequest)
 	// encode search controls
-	if searchRequest.Controls != nil {
+	if len(searchRequest.Controls) > 0 {
 		packet.AppendChild(encodeControls(searchRequest.Controls))
 	}
 
diff --git a/vendor/vendor.json b/vendor/vendor.json
index aaf431a67ff6..070e4316b56b 100644
--- a/vendor/vendor.json
+++ b/vendor/vendor.json
@@ -817,10 +817,10 @@
 			"revisionTime": "2017-10-26T18:46:43Z"
 		},
 		{
-			"checksumSHA1": "1AP23CNIbIxDH/auM59029H0CGY=",
+			"checksumSHA1": "3qxR+iktZ/aLpuq9by7pel2YM7w=",
 			"path": "github.com/go-ldap/ldap",
-			"revision": "0ae9f2495c4a9e5d436bc9a2b13a71a2fb06ddf3",
-			"revisionTime": "2017-09-29T19:17:40Z"
+			"revision": "23c4ee25d1434f2231f92afaeebfbfa7900ebbb0",
+			"revisionTime": "2017-12-09T13:38:01Z"
 		},
 		{
 			"checksumSHA1": "6dTGC5A1Y1xnv+JSi9z8S6JfnH0=",