diff --git a/git-codereview/go19_test.go b/git-codereview/go19_test.go
deleted file mode 100644
index 999769d..0000000
--- a/git-codereview/go19_test.go
+++ /dev/null
@@ -1,14 +0,0 @@
-// Copyright 2017 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 go1.9
-// +build go1.9
-
-package main
-
-import "testing"
-
-func init() {
-	setHelper = (*testing.T).Helper
-}
diff --git a/git-codereview/pending_test.go b/git-codereview/pending_test.go
index d46c1d8..1823439 100644
--- a/git-codereview/pending_test.go
+++ b/git-codereview/pending_test.go
@@ -14,9 +14,6 @@
 	"testing"
 )
 
-// setHelper calls t.Helper() for Go 1.9+ (see go19_test.go) and does nothing otherwise.
-var setHelper = func(t *testing.T) {}
-
 func TestPendingNone(t *testing.T) {
 	gt := newGitTest(t)
 	defer gt.done()
@@ -470,12 +467,12 @@
 }
 
 func testPending(t *testing.T, want string) {
-	setHelper(t)
+	t.Helper()
 	testPendingArgs(t, nil, want)
 }
 
 func testPendingArgs(t *testing.T, args []string, want string) {
-	setHelper(t)
+	t.Helper()
 	// fake auth information to avoid Gerrit error
 	if !auth.initialized {
 		auth.initialized = true
diff --git a/go.mod b/go.mod
index e3509ac..5a82dfc 100644
--- a/go.mod
+++ b/go.mod
@@ -1,3 +1,3 @@
 module golang.org/x/review
 
-go 1.13
+go 1.18