diff --git a/vendor.conf b/vendor.conf
index 6ef103ecdb..d26c034375 100644
--- a/vendor.conf
+++ b/vendor.conf
@@ -120,7 +120,7 @@ github.com/prometheus/common ebdfc6da46522d58825777cf1f90490a5b1ef1d8
 github.com/prometheus/procfs abf152e5f3e97f2fafac028d2cc06c1feb87ffa5
 bitbucket.org/ww/goautoneg 75cd24fc2f2c2a2088577d12123ddee5f54e0675
 github.com/matttproud/golang_protobuf_extensions fc2b8d3a73c4867e51861bbdd5ae3c1f0869dd6a
-github.com/pkg/errors 01fa4104b9c248c8945d14d9f128454d5b28d595
+github.com/pkg/errors 839d9e913e063e28dfd0e6c7b7512793e0a48be9
 
 # cli
 github.com/spf13/cobra v1.5 https://github.com/dnephin/cobra.git
diff --git a/vendor/github.com/pkg/errors/LICENSE b/vendor/github.com/pkg/errors/LICENSE
index fafcaafdc7..835ba3e755 100644
--- a/vendor/github.com/pkg/errors/LICENSE
+++ b/vendor/github.com/pkg/errors/LICENSE
@@ -21,4 +21,3 @@ SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
 CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
 OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
diff --git a/vendor/github.com/pkg/errors/errors.go b/vendor/github.com/pkg/errors/errors.go
index 65bf7a0fa5..842ee80456 100644
--- a/vendor/github.com/pkg/errors/errors.go
+++ b/vendor/github.com/pkg/errors/errors.go
@@ -14,13 +14,18 @@
 // Adding context to an error
 //
 // The errors.Wrap function returns a new error that adds context to the
-// original error. For example
+// original error by recording a stack trace at the point Wrap is called,
+// and the supplied message. For example
 //
 //     _, err := ioutil.ReadAll(r)
 //     if err != nil {
 //             return errors.Wrap(err, "read failed")
 //     }
 //
+// If additional control is required the errors.WithStack and errors.WithMessage
+// functions destructure errors.Wrap into its component operations of annotating
+// an error with a stack trace and an a message, respectively.
+//
 // Retrieving the cause of an error
 //
 // Using errors.Wrap constructs a stack of errors, adding context to the
@@ -28,7 +33,7 @@
 // to reverse the operation of errors.Wrap to retrieve the original error
 // for inspection. Any error value which implements this interface
 //
-//     type Causer interface {
+//     type causer interface {
 //             Cause() error
 //     }
 //
@@ -43,6 +48,9 @@
 //             // unknown error
 //     }
 //
+// causer interface is not exported by this package, but is considered a part
+// of stable public API.
+//
 // Formatted printing of errors
 //
 // All error values returned from this package implement fmt.Formatter and can
@@ -59,7 +67,7 @@
 // New, Errorf, Wrap, and Wrapf record a stack trace at the point they are
 // invoked. This information can be retrieved with the following interface.
 //
-//     type StackTrace interface {
+//     type stackTracer interface {
 //             StackTrace() errors.StackTrace
 //     }
 //
@@ -67,16 +75,19 @@
 //
 //     type StackTrace []Frame
 //
-// The Frame type represents a call site in the stacktrace. Frame supports
+// The Frame type represents a call site in the stack trace. Frame supports
 // the fmt.Formatter interface that can be used for printing information about
-// the stacktrace of this error. For example:
+// the stack trace of this error. For example:
 //
-//     if err, ok := err.(StackTrace); ok {
+//     if err, ok := err.(stackTracer); ok {
 //             for _, f := range err.StackTrace() {
 //                     fmt.Printf("%+s:%d", f)
 //             }
 //     }
 //
+// stackTracer interface is not exported by this package, but is considered a part
+// of stable public API.
+//
 // See the documentation for Frame.Format for more details.
 package errors
 
@@ -85,102 +96,149 @@ import (
 	"io"
 )
 
-// _error is an error implementation returned by New and Errorf
-// that implements its own fmt.Formatter.
-type _error struct {
-	msg string
-	*stack
-}
-
-func (e _error) Error() string { return e.msg }
-
-func (e _error) Format(s fmt.State, verb rune) {
-	switch verb {
-	case 'v':
-		if s.Flag('+') {
-			io.WriteString(s, e.msg)
-			fmt.Fprintf(s, "%+v", e.StackTrace())
-			return
-		}
-		fallthrough
-	case 's':
-		io.WriteString(s, e.msg)
-	}
-}
-
 // New returns an error with the supplied message.
+// New also records the stack trace at the point it was called.
 func New(message string) error {
-	return _error{
-		message,
-		callers(),
+	return &fundamental{
+		msg:   message,
+		stack: callers(),
 	}
 }
 
 // Errorf formats according to a format specifier and returns the string
 // as a value that satisfies error.
+// Errorf also records the stack trace at the point it was called.
 func Errorf(format string, args ...interface{}) error {
-	return _error{
-		fmt.Sprintf(format, args...),
+	return &fundamental{
+		msg:   fmt.Sprintf(format, args...),
+		stack: callers(),
+	}
+}
+
+// fundamental is an error that has a message and a stack, but no caller.
+type fundamental struct {
+	msg string
+	*stack
+}
+
+func (f *fundamental) Error() string { return f.msg }
+
+func (f *fundamental) Format(s fmt.State, verb rune) {
+	switch verb {
+	case 'v':
+		if s.Flag('+') {
+			io.WriteString(s, f.msg)
+			f.stack.Format(s, verb)
+			return
+		}
+		fallthrough
+	case 's':
+		io.WriteString(s, f.msg)
+	case 'q':
+		fmt.Fprintf(s, "%q", f.msg)
+	}
+}
+
+// WithStack annotates err with a stack trace at the point WithStack was called.
+// If err is nil, WithStack returns nil.
+func WithStack(err error) error {
+	if err == nil {
+		return nil
+	}
+	return &withStack{
+		err,
 		callers(),
 	}
 }
 
-type cause struct {
-	cause error
-	msg   string
-}
-
-func (c cause) Error() string { return fmt.Sprintf("%s: %v", c.msg, c.Cause()) }
-func (c cause) Cause() error  { return c.cause }
-
-// wrapper is an error implementation returned by Wrap and Wrapf
-// that implements its own fmt.Formatter.
-type wrapper struct {
-	cause
+type withStack struct {
+	error
 	*stack
 }
 
-func (w wrapper) Format(s fmt.State, verb rune) {
+func (w *withStack) Cause() error { return w.error }
+
+func (w *withStack) Format(s fmt.State, verb rune) {
 	switch verb {
 	case 'v':
 		if s.Flag('+') {
-			fmt.Fprintf(s, "%+v\n", w.Cause())
-			fmt.Fprintf(s, "%+v: %s", w.StackTrace()[0], w.msg)
+			fmt.Fprintf(s, "%+v", w.Cause())
+			w.stack.Format(s, verb)
 			return
 		}
 		fallthrough
 	case 's':
 		io.WriteString(s, w.Error())
+	case 'q':
+		fmt.Fprintf(s, "%q", w.Error())
 	}
 }
 
-// Wrap returns an error annotating err with message.
+// Wrap returns an error annotating err with a stack trace
+// at the point Wrap is called, and the supplied message.
 // If err is nil, Wrap returns nil.
 func Wrap(err error, message string) error {
 	if err == nil {
 		return nil
 	}
-	return wrapper{
-		cause: cause{
-			cause: err,
-			msg:   message,
-		},
-		stack: callers(),
+	err = &withMessage{
+		cause: err,
+		msg:   message,
+	}
+	return &withStack{
+		err,
+		callers(),
 	}
 }
 
-// Wrapf returns an error annotating err with the format specifier.
+// Wrapf returns an error annotating err with a stack trace
+// at the point Wrapf is call, and the format specifier.
 // If err is nil, Wrapf returns nil.
 func Wrapf(err error, format string, args ...interface{}) error {
 	if err == nil {
 		return nil
 	}
-	return wrapper{
-		cause: cause{
-			cause: err,
-			msg:   fmt.Sprintf(format, args...),
-		},
-		stack: callers(),
+	err = &withMessage{
+		cause: err,
+		msg:   fmt.Sprintf(format, args...),
+	}
+	return &withStack{
+		err,
+		callers(),
+	}
+}
+
+// WithMessage annotates err with a new message.
+// If err is nil, WithMessage returns nil.
+func WithMessage(err error, message string) error {
+	if err == nil {
+		return nil
+	}
+	return &withMessage{
+		cause: err,
+		msg:   message,
+	}
+}
+
+type withMessage struct {
+	cause error
+	msg   string
+}
+
+func (w *withMessage) Error() string { return w.msg + ": " + w.cause.Error() }
+func (w *withMessage) Cause() error  { return w.cause }
+
+func (w *withMessage) Format(s fmt.State, verb rune) {
+	switch verb {
+	case 'v':
+		if s.Flag('+') {
+			fmt.Fprintf(s, "%+v\n", w.Cause())
+			io.WriteString(s, w.msg)
+			return
+		}
+		fallthrough
+	case 's', 'q':
+		io.WriteString(s, w.Error())
 	}
 }
 
@@ -188,7 +246,7 @@ func Wrapf(err error, format string, args ...interface{}) error {
 // An error value has a cause if it implements the following
 // interface:
 //
-//     type Causer interface {
+//     type causer interface {
 //            Cause() error
 //     }
 //
diff --git a/vendor/github.com/pkg/errors/stack.go b/vendor/github.com/pkg/errors/stack.go
index 243a64a2ac..6b1f2891a5 100644
--- a/vendor/github.com/pkg/errors/stack.go
+++ b/vendor/github.com/pkg/errors/stack.go
@@ -100,6 +100,19 @@ func (st StackTrace) Format(s fmt.State, verb rune) {
 // stack represents a stack of program counters.
 type stack []uintptr
 
+func (s *stack) Format(st fmt.State, verb rune) {
+	switch verb {
+	case 'v':
+		switch {
+		case st.Flag('+'):
+			for _, pc := range *s {
+				f := Frame(pc)
+				fmt.Fprintf(st, "\n%+v", f)
+			}
+		}
+	}
+}
+
 func (s *stack) StackTrace() StackTrace {
 	f := make([]Frame, len(*s))
 	for i := 0; i < len(f); i++ {