diff --git a/internal/errors/errors_test.go b/internal/errors/errors_test.go
index 804eb96c2..d03b9920f 100644
--- a/internal/errors/errors_test.go
+++ b/internal/errors/errors_test.go
@@ -50,16 +50,16 @@ func TestErrors(t *testing.T) {
 		if got, want := test.err.Error(), prefix+test.wantText; got != want {
 			t.Errorf("%v.Error() = %q, want %q", test.what, got, want)
 		}
-		if got, want := Is(test.err, Error), true; got != want {
+		if got, want := errors.Is(test.err, Error), true; got != want {
 			t.Errorf("errors.Is(%v, errors.Error) = %v, want %v", test.what, got, want)
 		}
 		for _, err := range test.is {
-			if got, want := Is(test.err, err), true; got != want {
+			if got, want := errors.Is(test.err, err), true; got != want {
 				t.Errorf("errors.Is(%v, %v) = %v, want %v", test.what, err, got, want)
 			}
 		}
 		for _, err := range test.isNot {
-			if got, want := Is(test.err, err), false; got != want {
+			if got, want := errors.Is(test.err, err), false; got != want {
 				t.Errorf("errors.Is(%v, %v) = %v, want %v", test.what, err, got, want)
 			}
 		}
diff --git a/internal/errors/is_go112.go b/internal/errors/is_go112.go
deleted file mode 100644
index fbcd34920..000000000
--- a/internal/errors/is_go112.go
+++ /dev/null
@@ -1,40 +0,0 @@
-// Copyright 2020 The Go Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
-
-//go:build !go1.13
-// +build !go1.13
-
-package errors
-
-import "reflect"
-
-// Is is a copy of Go 1.13's errors.Is for use with older Go versions.
-func Is(err, target error) bool {
-	if target == nil {
-		return err == target
-	}
-
-	isComparable := reflect.TypeOf(target).Comparable()
-	for {
-		if isComparable && err == target {
-			return true
-		}
-		if x, ok := err.(interface{ Is(error) bool }); ok && x.Is(target) {
-			return true
-		}
-		if err = unwrap(err); err == nil {
-			return false
-		}
-	}
-}
-
-func unwrap(err error) error {
-	u, ok := err.(interface {
-		Unwrap() error
-	})
-	if !ok {
-		return nil
-	}
-	return u.Unwrap()
-}
diff --git a/internal/errors/is_go113.go b/internal/errors/is_go113.go
deleted file mode 100644
index 5e72f1cde..000000000
--- a/internal/errors/is_go113.go
+++ /dev/null
@@ -1,13 +0,0 @@
-// Copyright 2020 The Go Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
-
-//go:build go1.13
-// +build go1.13
-
-package errors
-
-import "errors"
-
-// Is is errors.Is.
-func Is(err, target error) bool { return errors.Is(err, target) }
diff --git a/proto/decode_test.go b/proto/decode_test.go
index c0a15e2b4..ba83942a3 100644
--- a/proto/decode_test.go
+++ b/proto/decode_test.go
@@ -6,6 +6,7 @@ package proto_test
 
 import (
 	"bytes"
+	"errors"
 	"fmt"
 	"reflect"
 	"testing"
@@ -16,7 +17,6 @@ import (
 	"google.golang.org/protobuf/testing/protopack"
 	"google.golang.org/protobuf/types/known/durationpb"
 
-	"google.golang.org/protobuf/internal/errors"
 	testpb "google.golang.org/protobuf/internal/testprotos/test"
 	test3pb "google.golang.org/protobuf/internal/testprotos/test3"
 )
diff --git a/proto/encode_test.go b/proto/encode_test.go
index 73b3b1817..947953f08 100644
--- a/proto/encode_test.go
+++ b/proto/encode_test.go
@@ -6,6 +6,7 @@ package proto_test
 
 import (
 	"bytes"
+	"errors"
 	"fmt"
 	"math"
 	"reflect"
@@ -19,7 +20,6 @@ import (
 	"google.golang.org/protobuf/reflect/protoreflect"
 	"google.golang.org/protobuf/types/known/durationpb"
 
-	"google.golang.org/protobuf/internal/errors"
 	orderpb "google.golang.org/protobuf/internal/testprotos/order"
 	testpb "google.golang.org/protobuf/internal/testprotos/test"
 	test3pb "google.golang.org/protobuf/internal/testprotos/test3"