diff --git a/go.mod b/go.mod
index c84997ce..32084d19 100644
--- a/go.mod
+++ b/go.mod
@@ -5,6 +5,6 @@ go 1.15
 require (
 	github.com/nginxinc/nginx-plus-go-client v0.8.0
 	github.com/prometheus/client_golang v1.9.0
-	github.com/prometheus/common v0.16.0
+	github.com/prometheus/common v0.19.0
 	google.golang.org/protobuf v1.24.0 // indirect
 )
diff --git a/go.sum b/go.sum
index 4cfb6474..65d442ff 100644
--- a/go.sum
+++ b/go.sum
@@ -232,8 +232,8 @@ github.com/prometheus/common v0.10.0 h1:RyRA7RzGXQZiW+tGMr7sxa85G1z0yOpM1qq5c8lN
 github.com/prometheus/common v0.10.0/go.mod h1:Tlit/dnDKsSWFlCLTWaA1cyBgKHSMdTB80sz/V91rCo=
 github.com/prometheus/common v0.15.0 h1:4fgOnadei3EZvgRwxJ7RMpG1k1pOZth5Pc13tyspaKM=
 github.com/prometheus/common v0.15.0/go.mod h1:U+gB1OBLb1lF3O42bTCL+FK18tX9Oar16Clt/msog/s=
-github.com/prometheus/common v0.16.0 h1:VMiIg2fcMM+QkvAaPo6Hatk8OgpVHh4Yzp1+ljjjQAQ=
-github.com/prometheus/common v0.16.0/go.mod h1:U+gB1OBLb1lF3O42bTCL+FK18tX9Oar16Clt/msog/s=
+github.com/prometheus/common v0.19.0 h1:Itb4+NjG9wRdkAWgVucbM/adyIXxEhbw0866e0uZE6A=
+github.com/prometheus/common v0.19.0/go.mod h1:U+gB1OBLb1lF3O42bTCL+FK18tX9Oar16Clt/msog/s=
 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/model/time.go b/vendor/github.com/prometheus/common/model/time.go
index 77b82b2b..e684ebd1 100644
--- a/vendor/github.com/prometheus/common/model/time.go
+++ b/vendor/github.com/prometheus/common/model/time.go
@@ -14,6 +14,7 @@
 package model
 
 import (
+	"encoding/json"
 	"fmt"
 	"math"
 	"regexp"
@@ -254,6 +255,25 @@ func (d Duration) String() string {
 	return r
 }
 
+// MarshalJSON implements the json.Marshaler interface.
+func (d Duration) MarshalJSON() ([]byte, error) {
+	return json.Marshal(d.String())
+}
+
+// UnmarshalJSON implements the json.Unmarshaler interface.
+func (d *Duration) UnmarshalJSON(bytes []byte) error {
+	var s string
+	if err := json.Unmarshal(bytes, &s); err != nil {
+		return err
+	}
+	dur, err := ParseDuration(s)
+	if err != nil {
+		return err
+	}
+	*d = dur
+	return nil
+}
+
 // MarshalText implements the encoding.TextMarshaler interface.
 func (d *Duration) MarshalText() ([]byte, error) {
 	return []byte(d.String()), nil
diff --git a/vendor/modules.txt b/vendor/modules.txt
index 8b46f6e5..4f6868b8 100644
--- a/vendor/modules.txt
+++ b/vendor/modules.txt
@@ -20,7 +20,7 @@ github.com/prometheus/client_golang/prometheus/internal
 github.com/prometheus/client_golang/prometheus/promhttp
 # github.com/prometheus/client_model v0.2.0
 github.com/prometheus/client_model/go
-# github.com/prometheus/common v0.16.0
+# github.com/prometheus/common v0.19.0
 ## explicit
 github.com/prometheus/common/expfmt
 github.com/prometheus/common/internal/bitbucket.org/ww/goautoneg