diff --git a/go.mod b/go.mod
index b370bea100..29417f2fc1 100644
--- a/go.mod
+++ b/go.mod
@@ -53,7 +53,7 @@ require (
 	github.com/prometheus/alertmanager v0.20.0
 	github.com/prometheus/client_golang v1.6.0
 	github.com/prometheus/client_model v0.2.0
-	github.com/prometheus/common v0.9.1
+	github.com/prometheus/common v0.10.0
 	github.com/samuel/go-zookeeper v0.0.0-20190923202752-2cc03de413da
 	github.com/shurcooL/httpfs v0.0.0-20190707220628-8d4bc4ba7749
 	github.com/shurcooL/vfsgen v0.0.0-20181202132449-6a9ea43bcacd
diff --git a/go.sum b/go.sum
index 7f11608039..613ccd7cfc 100644
--- a/go.sum
+++ b/go.sum
@@ -670,6 +670,8 @@ github.com/prometheus/common v0.7.0 h1:L+1lyG48J1zAQXA3RBX/nG/B3gjlHq0zTt2tlbJLy
 github.com/prometheus/common v0.7.0/go.mod h1:DjGbpBbp5NYNiECxcL/VnbXCCaQpKd3tt26CguLLsqA=
 github.com/prometheus/common v0.9.1 h1:KOMtN28tlbam3/7ZKEYKHhKoJZYYj3gMH4uc62x7X7U=
 github.com/prometheus/common v0.9.1/go.mod h1:yhUN8i9wzaXS3w1O07YhxHEBxD+W35wd8bs7vj7HSQ4=
+github.com/prometheus/common v0.10.0 h1:RyRA7RzGXQZiW+tGMr7sxa85G1z0yOpM1qq5c8lNawc=
+github.com/prometheus/common v0.10.0/go.mod h1:Tlit/dnDKsSWFlCLTWaA1cyBgKHSMdTB80sz/V91rCo=
 github.com/prometheus/procfs v0.0.0-20181005140218-185b4288413d/go.mod h1:c3At6R/oaqEKCNdg8wHV1ftS6bRYblBhIjjI8uT2IGk=
 github.com/prometheus/procfs v0.0.0-20190117184657-bf6a532e95b1/go.mod h1:c3At6R/oaqEKCNdg8wHV1ftS6bRYblBhIjjI8uT2IGk=
 github.com/prometheus/procfs v0.0.2/go.mod h1:TjEm7ze935MbeOT/UhFTIMYKhuLP4wbCsTZCD3I8kEA=
diff --git a/vendor/github.com/prometheus/common/config/http_config.go b/vendor/github.com/prometheus/common/config/http_config.go
index 5c373d7a69..9b1fad93fa 100644
--- a/vendor/github.com/prometheus/common/config/http_config.go
+++ b/vendor/github.com/prometheus/common/config/http_config.go
@@ -29,6 +29,7 @@ import (
 	"time"
 
 	"github.com/mwitkow/go-conntrack"
+	"golang.org/x/net/http2"
 	"gopkg.in/yaml.v2"
 )
 
@@ -153,6 +154,11 @@ func NewRoundTripperFromConfig(cfg HTTPClientConfig, name string, disableKeepAli
 				conntrack.DialWithName(name),
 			),
 		}
+		// TODO: use ForceAttemptHTTP2 when we move to Go 1.13+.
+		err := http2.ConfigureTransport(rt.(*http.Transport))
+		if err != nil {
+			return nil, err
+		}
 
 		// If a bearer token is provided, create a round tripper that will set the
 		// Authorization header correctly on each request.
diff --git a/vendor/github.com/prometheus/common/model/time.go b/vendor/github.com/prometheus/common/model/time.go
index 7b0064fdb2..490a0240c1 100644
--- a/vendor/github.com/prometheus/common/model/time.go
+++ b/vendor/github.com/prometheus/common/model/time.go
@@ -186,6 +186,10 @@ var durationRE = regexp.MustCompile("^([0-9]+)(y|w|d|h|m|s|ms)$")
 // ParseDuration parses a string into a time.Duration, assuming that a year
 // always has 365d, a week always has 7d, and a day always has 24h.
 func ParseDuration(durationStr string) (Duration, error) {
+	// Allow 0 without a unit.
+	if durationStr == "0" {
+		return 0, nil
+	}
 	matches := durationRE.FindStringSubmatch(durationStr)
 	if len(matches) != 3 {
 		return 0, fmt.Errorf("not a valid duration string: %q", durationStr)
diff --git a/vendor/github.com/prometheus/common/promlog/log.go b/vendor/github.com/prometheus/common/promlog/log.go
index 45fcbc4085..5062e2805e 100644
--- a/vendor/github.com/prometheus/common/promlog/log.go
+++ b/vendor/github.com/prometheus/common/promlog/log.go
@@ -94,13 +94,15 @@ type Config struct {
 // with a timestamp. The output always goes to stderr.
 func New(config *Config) log.Logger {
 	var l log.Logger
-	if config.Format.s == "logfmt" {
-		l = log.NewLogfmtLogger(log.NewSyncWriter(os.Stderr))
-	} else {
+	if config.Format != nil && config.Format.s == "json" {
 		l = log.NewJSONLogger(log.NewSyncWriter(os.Stderr))
+	} else {
+		l = log.NewLogfmtLogger(log.NewSyncWriter(os.Stderr))
 	}
 
-	l = level.NewFilter(l, config.Level.o)
+	if config.Level != nil {
+		l = level.NewFilter(l, config.Level.o)
+	}
 	l = log.With(l, "ts", timestampFormat, "caller", log.DefaultCaller)
 	return l
 }
diff --git a/vendor/modules.txt b/vendor/modules.txt
index 58c970f91c..829d091137 100644
--- a/vendor/modules.txt
+++ b/vendor/modules.txt
@@ -286,7 +286,7 @@ github.com/prometheus/client_golang/prometheus/testutil
 github.com/prometheus/client_golang/prometheus/testutil/promlint
 # github.com/prometheus/client_model v0.2.0
 github.com/prometheus/client_model/go
-# github.com/prometheus/common v0.9.1
+# github.com/prometheus/common v0.10.0
 github.com/prometheus/common/config
 github.com/prometheus/common/expfmt
 github.com/prometheus/common/internal/bitbucket.org/ww/goautoneg