diff --git a/vendor/github.com/mongodb/mongo-go-driver/x/mongo/driver/dispatch.go b/vendor/github.com/mongodb/mongo-go-driver/x/mongo/driver/dispatch.go
new file mode 100644
index 0000000..2ec642a
--- /dev/null
+++ b/vendor/github.com/mongodb/mongo-go-driver/x/mongo/driver/dispatch.go
@@ -0,0 +1,67 @@
+// Copyright (C) MongoDB, Inc. 2017-present.
+//
+// Licensed under the Apache License, Version 2.0 (the "License"); you may
+// not use this file except in compliance with the License. You may obtain
+// a copy of the License at http://www.apache.org/licenses/LICENSE-2.0
+
+package driver
+
+import (
+	"errors"
+
+	"github.com/mongodb/mongo-go-driver/bson"
+	"github.com/mongodb/mongo-go-driver/bson/bsoncodec"
+	"github.com/mongodb/mongo-go-driver/x/bsonx"
+	"github.com/mongodb/mongo-go-driver/x/mongo/driver/session"
+)
+
+// ErrCollation is caused if a collation is given for an invalid server version.
+var ErrCollation = errors.New("collation cannot be set for server versions < 3.4")
+
+// ErrArrayFilters is caused if array filters are given for an invalid server version.
+var ErrArrayFilters = errors.New("array filters cannot be set for server versions < 3.6")
+
+func interfaceToDocument(val interface{}, registry *bsoncodec.Registry) (bsonx.Doc, error) {
+	if val == nil {
+		return bsonx.Doc{}, nil
+	}
+
+	if registry == nil {
+		registry = bson.DefaultRegistry
+	}
+
+	if bs, ok := val.([]byte); ok {
+		// Slight optimization so we'll just use MarshalBSON and not go through the codec machinery.
+		val = bson.Raw(bs)
+	}
+
+	// TODO(skriptble): Use a pool of these instead.
+	buf := make([]byte, 0, 256)
+	b, err := bson.MarshalAppendWithRegistry(registry, buf, val)
+	if err != nil {
+		return nil, err
+	}
+	return bsonx.ReadDoc(b)
+}
+
+func interfaceToElement(key string, i interface{}, registry *bsoncodec.Registry) (bsonx.Elem, error) {
+	switch conv := i.(type) {
+	case string:
+		return bsonx.Elem{key, bsonx.String(conv)}, nil
+	case bsonx.Doc:
+		return bsonx.Elem{key, bsonx.Document(conv)}, nil
+	default:
+		doc, err := interfaceToDocument(i, registry)
+		if err != nil {
+			return bsonx.Elem{}, err
+		}
+
+		return bsonx.Elem{key, bsonx.Document(doc)}, nil
+	}
+}
+
+func closeImplicitSession(sess *session.Client) {
+	if sess != nil && sess.SessionType == session.Implicit {
+		sess.EndSession()
+	}
+}