diff --git a/vendor/github.com/prometheus/common/expfmt/fuzz.go b/vendor/github.com/prometheus/common/expfmt/fuzz.go
index 14f920146..dc2eedeef 100644
--- a/vendor/github.com/prometheus/common/expfmt/fuzz.go
+++ b/vendor/github.com/prometheus/common/expfmt/fuzz.go
@@ -20,8 +20,8 @@ import "bytes"
 
 // Fuzz text metric parser with with github.com/dvyukov/go-fuzz:
 //
-//     go-fuzz-build github.com/prometheus/client_golang/text
-//     go-fuzz -bin text-fuzz.zip -workdir fuzz
+//     go-fuzz-build github.com/prometheus/common/expfmt
+//     go-fuzz -bin expfmt-fuzz.zip -workdir fuzz
 //
 // Further input samples should go in the folder fuzz/corpus.
 func Fuzz(in []byte) int {
diff --git a/vendor/github.com/prometheus/common/model/value.go b/vendor/github.com/prometheus/common/model/value.go
index 10ffb0bd6..dbf5d10e4 100644
--- a/vendor/github.com/prometheus/common/model/value.go
+++ b/vendor/github.com/prometheus/common/model/value.go
@@ -16,6 +16,7 @@ package model
 import (
 	"encoding/json"
 	"fmt"
+	"math"
 	"sort"
 	"strconv"
 	"strings"
@@ -43,8 +44,14 @@ func (v *SampleValue) UnmarshalJSON(b []byte) error {
 	return nil
 }
 
+// Equal returns true if the value of v and o is equal or if both are NaN. Note
+// that v==o is false if both are NaN. If you want the conventional float
+// behavior, use == to compare two SampleValues.
 func (v SampleValue) Equal(o SampleValue) bool {
-	return v == o
+	if v == o {
+		return true
+	}
+	return math.IsNaN(float64(v)) && math.IsNaN(float64(o))
 }
 
 func (v SampleValue) String() string {
@@ -77,9 +84,9 @@ func (s *SamplePair) UnmarshalJSON(b []byte) error {
 }
 
 // Equal returns true if this SamplePair and o have equal Values and equal
-// Timestamps.
+// Timestamps. The sematics of Value equality is defined by SampleValue.Equal.
 func (s *SamplePair) Equal(o *SamplePair) bool {
-	return s == o || (s.Value == o.Value && s.Timestamp.Equal(o.Timestamp))
+	return s == o || (s.Value.Equal(o.Value) && s.Timestamp.Equal(o.Timestamp))
 }
 
 func (s SamplePair) String() string {
@@ -93,7 +100,8 @@ type Sample struct {
 	Timestamp Time        `json:"timestamp"`
 }
 
-// Equal compares first the metrics, then the timestamp, then the value.
+// Equal compares first the metrics, then the timestamp, then the value. The
+// sematics of value equality is defined by SampleValue.Equal.
 func (s *Sample) Equal(o *Sample) bool {
 	if s == o {
 		return true
@@ -105,7 +113,7 @@ func (s *Sample) Equal(o *Sample) bool {
 	if !s.Timestamp.Equal(o.Timestamp) {
 		return false
 	}
-	if s.Value != o.Value {
+	if s.Value.Equal(o.Value) {
 		return false
 	}
 
diff --git a/vendor/vendor.json b/vendor/vendor.json
index 286f74f22..94a84800f 100644
--- a/vendor/vendor.json
+++ b/vendor/vendor.json
@@ -161,35 +161,40 @@
 			"revisionTime": "2015-02-12T10:17:44Z"
 		},
 		{
+			"checksumSHA1": "l0JT1CAPc/22KdnxCke1LKtR+4M=",
 			"path": "github.com/prometheus/common/expfmt",
-			"revision": "23070236b1ebff452f494ae831569545c2b61d26",
-			"revisionTime": "2016-02-11T16:03:55+01:00"
+			"revision": "c16e34897a744c32f6733ee720e60c4de13887fb",
+			"revisionTime": "2016-05-19T16:20:33Z"
 		},
 		{
+			"checksumSHA1": "GWlM3d2vPYyNATtTFgftS10/A9w=",
 			"path": "github.com/prometheus/common/internal/bitbucket.org/ww/goautoneg",
-			"revision": "4fdc91a58c9d3696b982e8a680f4997403132d44",
-			"revisionTime": "2015-10-26T12:04:34+01:00"
+			"revision": "c16e34897a744c32f6733ee720e60c4de13887fb",
+			"revisionTime": "2016-05-19T16:20:33Z"
 		},
 		{
+			"checksumSHA1": "koBNYQryxAG8hyHBlpn8pcnSVdM=",
 			"path": "github.com/prometheus/common/log",
-			"revision": "0a3005bb37bc411040083a55372e77c405f6464c",
-			"revisionTime": "2016-01-04T14:47:38+01:00"
+			"revision": "c16e34897a744c32f6733ee720e60c4de13887fb",
+			"revisionTime": "2016-05-19T16:20:33Z"
 		},
 		{
+			"checksumSHA1": "Zgmg/aOfoCNTAMtrXqBJmt852t0=",
 			"path": "github.com/prometheus/common/model",
-			"revision": "167b27da48d058a9b46d84b834d67f68f0243f67",
-			"revisionTime": "2016-03-18T12:23:18Z"
+			"revision": "c16e34897a744c32f6733ee720e60c4de13887fb",
+			"revisionTime": "2016-05-19T16:20:33Z"
 		},
 		{
+			"checksumSHA1": "CKVJRc1NREmfoAWQLHxqWQlvxo0=",
 			"path": "github.com/prometheus/common/route",
-			"revision": "14ca1097bbe21584194c15e391a9dab95ad42a59",
-			"revisionTime": "2016-01-25T23:57:51+01:00"
+			"revision": "c16e34897a744c32f6733ee720e60c4de13887fb",
+			"revisionTime": "2016-05-19T16:20:33Z"
 		},
 		{
 			"checksumSHA1": "91KYK0SpvkaMJJA2+BcxbVnyRO0=",
 			"path": "github.com/prometheus/common/version",
-			"revision": "dd586c1c5abb0be59e60f942c22af711a2008cb4",
-			"revisionTime": "2016-05-03T22:05:32Z"
+			"revision": "c16e34897a744c32f6733ee720e60c4de13887fb",
+			"revisionTime": "2016-05-19T16:20:33Z"
 		},
 		{
 			"path": "github.com/prometheus/procfs",