diff --git a/vendor/github.com/golang/protobuf/jsonpb/decode.go b/vendor/github.com/golang/protobuf/jsonpb/decode.go
index 7c6c5a5..60e82ca 100644
--- a/vendor/github.com/golang/protobuf/jsonpb/decode.go
+++ b/vendor/github.com/golang/protobuf/jsonpb/decode.go
@@ -135,14 +135,14 @@
 	md := m.Descriptor()
 	fds := md.Fields()
 
-	if string(in) == "null" && md.FullName() != "google.protobuf.Value" {
-		return nil
-	}
-
 	if jsu, ok := proto.MessageV1(m.Interface()).(JSONPBUnmarshaler); ok {
 		return jsu.UnmarshalJSONPB(u, in)
 	}
 
+	if string(in) == "null" && md.FullName() != "google.protobuf.Value" {
+		return nil
+	}
+
 	switch wellKnownType(md.FullName()) {
 	case "Any":
 		var jsonObject map[string]json.RawMessage
@@ -332,11 +332,12 @@
 			raw = v
 		}
 
+		field := m.NewField(fd)
 		// Unmarshal the field value.
-		if raw == nil || (string(raw) == "null" && !isSingularWellKnownValue(fd)) {
+		if raw == nil || (string(raw) == "null" && !isSingularWellKnownValue(fd) && !isSingularJSONPBUnmarshaler(field, fd)) {
 			continue
 		}
-		v, err := u.unmarshalValue(m.NewField(fd), raw, fd)
+		v, err := u.unmarshalValue(field, raw, fd)
 		if err != nil {
 			return err
 		}
@@ -364,11 +365,12 @@
 			return fmt.Errorf("extension field %q does not extend message %q", xname, m.Descriptor().FullName())
 		}
 
+		field := m.NewField(fd)
 		// Unmarshal the field value.
-		if raw == nil || (string(raw) == "null" && !isSingularWellKnownValue(fd)) {
+		if raw == nil || (string(raw) == "null" && !isSingularWellKnownValue(fd) && !isSingularJSONPBUnmarshaler(field, fd)) {
 			continue
 		}
-		v, err := u.unmarshalValue(m.NewField(fd), raw, fd)
+		v, err := u.unmarshalValue(field, raw, fd)
 		if err != nil {
 			return err
 		}
@@ -390,6 +392,14 @@
 	return false
 }
 
+func isSingularJSONPBUnmarshaler(v protoreflect.Value, fd protoreflect.FieldDescriptor) bool {
+	if fd.Message() != nil && fd.Cardinality() != protoreflect.Repeated {
+		_, ok := proto.MessageV1(v.Interface()).(JSONPBUnmarshaler)
+		return ok
+	}
+	return false
+}
+
 func (u *Unmarshaler) unmarshalValue(v protoreflect.Value, in []byte, fd protoreflect.FieldDescriptor) (protoreflect.Value, error) {
 	switch {
 	case fd.IsList():
diff --git a/vendor/github.com/golang/protobuf/jsonpb/encode.go b/vendor/github.com/golang/protobuf/jsonpb/encode.go
index 7633019..685c80a 100644
--- a/vendor/github.com/golang/protobuf/jsonpb/encode.go
+++ b/vendor/github.com/golang/protobuf/jsonpb/encode.go
@@ -166,20 +166,25 @@
 		fd := fds.ByNumber(1)
 		return w.marshalValue(fd, m.Get(fd), indent)
 	case "Duration":
+		const maxSecondsInDuration = 315576000000
 		// "Generated output always contains 0, 3, 6, or 9 fractional digits,
 		//  depending on required precision."
 		s := m.Get(fds.ByNumber(1)).Int()
 		ns := m.Get(fds.ByNumber(2)).Int()
+		if s < -maxSecondsInDuration || s > maxSecondsInDuration {
+			return fmt.Errorf("seconds out of range %v", s)
+		}
 		if ns <= -secondInNanos || ns >= secondInNanos {
 			return fmt.Errorf("ns out of range (%v, %v)", -secondInNanos, secondInNanos)
 		}
 		if (s > 0 && ns < 0) || (s < 0 && ns > 0) {
 			return errors.New("signs of seconds and nanos do not match")
 		}
-		if s < 0 {
-			ns = -ns
+		var sign string
+		if s < 0 || ns < 0 {
+			sign, s, ns = "-", -1*s, -1*ns
 		}
-		x := fmt.Sprintf("%d.%09d", s, ns)
+		x := fmt.Sprintf("%s%d.%09d", sign, s, ns)
 		x = strings.TrimSuffix(x, "000")
 		x = strings.TrimSuffix(x, "000")
 		x = strings.TrimSuffix(x, ".000")