diff --git a/vendor/golang.org/x/net/http2/transport.go b/vendor/golang.org/x/net/http2/transport.go
index 81778be..d948e96 100644
--- a/vendor/golang.org/x/net/http2/transport.go
+++ b/vendor/golang.org/x/net/http2/transport.go
@@ -2198,6 +2198,8 @@
 	return nil
 }
 
+var errInvalidTrailers = errors.New("http2: invalid trailers")
+
 func (rl *clientConnReadLoop) endStream(cs *clientStream) {
 	// TODO: check that any declared content-length matches, like
 	// server.go's (*stream).endStream method.
@@ -2428,6 +2430,7 @@
 var (
 	errResponseHeaderListSize = errors.New("http2: response header list larger than advertised limit")
 	errRequestHeaderListSize  = errors.New("http2: request header list larger than peer's advertised limit")
+	errPseudoTrailers         = errors.New("http2: invalid pseudo header in trailers")
 )
 
 func (cc *ClientConn) logf(format string, args ...interface{}) {