diff --git a/go.mod b/go.mod
index 8bbcb43..5acb0bc 100644
--- a/go.mod
+++ b/go.mod
@@ -5,7 +5,7 @@ go 1.20
 require (
 	github.com/beorn7/perks v1.0.1
 	github.com/cespare/xxhash/v2 v2.2.0
-	github.com/davecgh/go-spew v1.1.1
+	github.com/google/go-cmp v0.6.0
 	github.com/json-iterator/go v1.1.12
 	github.com/prometheus/client_model v0.6.0
 	github.com/prometheus/common v0.52.3
diff --git a/go.sum b/go.sum
index 2c696c7..bd503a1 100644
--- a/go.sum
+++ b/go.sum
@@ -12,6 +12,7 @@ github.com/golang/protobuf v1.5.3 h1:KhyjKVUg7Usr/dYsdSqoFveMYd5ko72D+zANwlG1mmg
 github.com/golang/protobuf v1.5.3/go.mod h1:XVQd3VNwM+JqD3oG2Ue2ip4fOMUkwXdXDdiuN0vRsmY=
 github.com/google/go-cmp v0.5.5/go.mod h1:v8dTdLbMG2kIc/vJvl+f65V22dbkXbowE6jgT/gNBxE=
 github.com/google/go-cmp v0.6.0 h1:ofyhxvXcZhMsU5ulbFiLKl/XBFqE1GSq7atu8tAmTRI=
+github.com/google/go-cmp v0.6.0/go.mod h1:17dUlkBOakJ0+DkrSSNjCkIjxS6bF9zb3elmeNGIjoY=
 github.com/google/gofuzz v1.0.0/go.mod h1:dBl0BpW6vV/+mYPU4Po3pmUjxk6FQPldtuIdl/M65Eg=
 github.com/jpillora/backoff v1.0.0 h1:uvFg412JmmHBHw7iwprIxkPMI+sGQ4kzOWsMeHnm2EA=
 github.com/jpillora/backoff v1.0.0/go.mod h1:J/6gKK9jxlEcS3zixgDgUAsiuZ7yrSoa/FX5e0EB2j4=
diff --git a/prometheus/testutil/testutil.go b/prometheus/testutil/testutil.go
index 9dce15e..e24baf2 100644
--- a/prometheus/testutil/testutil.go
+++ b/prometheus/testutil/testutil.go
@@ -44,7 +44,7 @@ import (
 	"net/http"
 	"reflect"
 
-	"github.com/davecgh/go-spew/spew"
+	"github.com/google/go-cmp/cmp"
 	dto "github.com/prometheus/client_model/go"
 	"github.com/prometheus/common/expfmt"
 	"google.golang.org/protobuf/proto"
@@ -264,6 +264,7 @@ func compareMetricFamilies(got, expected []*dto.MetricFamily, metricNames ...str
 // The error contains the encoded text of both the desired and the actual
 // result.
 func compare(got, want []*dto.MetricFamily) error {
+
 	var gotBuf, wantBuf bytes.Buffer
 	enc := expfmt.NewEncoder(&gotBuf, expfmt.NewFormat(expfmt.TypeTextPlain))
 	for _, mf := range got {
@@ -277,7 +278,7 @@ func compare(got, want []*dto.MetricFamily) error {
 			return fmt.Errorf("encoding expected metrics failed: %w", err)
 		}
 	}
-	if diffErr := diff(wantBuf, gotBuf); diffErr != "" {
+	if diffErr := diff(gotBuf.String(), wantBuf.String()); diffErr != "" {
 		return fmt.Errorf(diffErr)
 	}
 	return nil
@@ -300,31 +301,7 @@ func diff(expected, actual interface{}) string {
 		return ""
 	}
 
-	var e, a string
-	c := spew.ConfigState{
-		Indent:                  " ",
-		DisablePointerAddresses: true,
-		DisableCapacities:       true,
-		SortKeys:                true,
-	}
-	if et != reflect.TypeOf("") {
-		e = c.Sdump(expected)
-		a = c.Sdump(actual)
-	} else {
-		e = reflect.ValueOf(expected).String()
-		a = reflect.ValueOf(actual).String()
-	}
-
-	diff, _ := internal.GetUnifiedDiffString(internal.UnifiedDiff{
-		A:        internal.SplitLines(e),
-		B:        internal.SplitLines(a),
-		FromFile: "metric output does not match expectation; want",
-		FromDate: "",
-		ToFile:   "got:",
-		ToDate:   "",
-		Context:  1,
-	})
-
+	diff := cmp.Diff(expected, actual)
 	if diff == "" {
 		return ""
 	}
diff --git a/prometheus/testutil/testutil_test.go b/prometheus/testutil/testutil_test.go
index f2e1cba..054cf63 100644
--- a/prometheus/testutil/testutil_test.go
+++ b/prometheus/testutil/testutil_test.go
@@ -305,20 +305,36 @@ func TestMetricNotFound(t *testing.T) {
 	expected := `
 		some_other_metric{label1="value1"} 1
 	`
+	/*
+	   	expectedError := `
+
+	   Diff:
+	   --- metric output does not match expectation; want
+	   +++ got:
+	   @@ -1,4 +1,4 @@
+	   -(bytes.Buffer) # HELP some_other_metric A value that represents a counter.
+	   -# TYPE some_other_metric counter
+	   -some_other_metric{label1="value1"} 1
+	   +(bytes.Buffer) # HELP some_total A value that represents a counter.
+	   +# TYPE some_total counter
+	   +some_total{label1="value1"} 1
+
+	   `
+	*/
 
 	expectedError := `
 
 Diff:
---- metric output does not match expectation; want
-+++ got:
-@@ -1,4 +1,4 @@
--(bytes.Buffer) # HELP some_other_metric A value that represents a counter.
--# TYPE some_other_metric counter
--some_other_metric{label1="value1"} 1
-+(bytes.Buffer) # HELP some_total A value that represents a counter.
-+# TYPE some_total counter
-+some_total{label1="value1"} 1
- 
+  (
+  	"""
+- 	# HELP some_total A value that represents a counter.
+- 	# TYPE some_total counter
+- 	some_total{label1="value1"} 1
++ 	# HELP some_other_metric A value that represents a counter.
++ 	# TYPE some_other_metric counter
++ 	some_other_metric{label1="value1"} 1
+  	"""
+  )
 `
 
 	err := CollectAndCompare(c, strings.NewReader(metadata+expected))