diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index 1f1de139..2f00dd63 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -11,7 +11,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        go-version: [1.15.x, 1.16.x]
+        go-version: [1.16.x, 1.17.x]
         os: [ubuntu-latest, macos-latest, windows-latest]
     runs-on: ${{ matrix.os }}
     steps:
diff --git a/go.mod b/go.mod
index 07e2c3c4..ef958134 100644
--- a/go.mod
+++ b/go.mod
@@ -1,6 +1,6 @@
 module github.com/rogpeppe/go-internal
 
-go 1.15
+go 1.16
 
 require (
 	github.com/pkg/diff v0.0.0-20210226163009-20ebb0f2a09e
diff --git a/testscript/exe.go b/testscript/exe.go
index fa048c71..1be7d0f6 100644
--- a/testscript/exe.go
+++ b/testscript/exe.go
@@ -15,7 +15,6 @@ import (
 	"path/filepath"
 	"runtime"
 	"strings"
-	"testing"
 )
 
 // TestingM is implemented by *testing.M. It's defined as an interface
@@ -228,7 +227,7 @@ func runCoverSubcommand(cprof string, mainf func() int) (exitCode int) {
 
 		// Run MainStart (recursively, but it we should be ok) with no tests
 		// so that it writes the coverage profile.
-		m := testing.MainStart(nopTestDeps{}, nil, nil, nil)
+		m := mainStart()
 		if code := m.Run(); code != 0 && exitCode == 0 {
 			exitCode = code
 		}
diff --git a/testscript/exe_go118.go b/testscript/exe_go118.go
new file mode 100644
index 00000000..dae0fcfc
--- /dev/null
+++ b/testscript/exe_go118.go
@@ -0,0 +1,49 @@
+//go:build go1.18
+
+package testscript
+
+import (
+	"reflect"
+	"testing"
+	"time"
+)
+
+func mainStart() *testing.M {
+	return testing.MainStart(nopTestDeps{}, nil, nil, nil, nil)
+}
+
+// Note: corpusEntry is an anonymous struct type used by some method stubs.
+type corpusEntry = struct {
+	Parent     string
+	Name       string
+	Data       []byte
+	Values     []interface{}
+	Generation int
+	IsSeed     bool
+}
+
+// Note: CoordinateFuzzing was added in Go 1.18.
+func (nopTestDeps) CoordinateFuzzing(time.Duration, int64, time.Duration, int64, int, []corpusEntry, []reflect.Type, string, string) error {
+	return nil
+}
+
+// Note: RunFuzzWorker was added in Go 1.18.
+func (nopTestDeps) RunFuzzWorker(func(corpusEntry) error) error {
+	return nil
+}
+
+// Note: ReadCorpus was added in Go 1.18.
+func (nopTestDeps) ReadCorpus(string, []reflect.Type) ([]corpusEntry, error) {
+	return nil, nil
+}
+
+// Note: CheckCorpus was added in Go 1.18.
+func (nopTestDeps) CheckCorpus([]interface{}, []reflect.Type) error {
+	return nil
+}
+
+// Note: ResetCoverage was added in Go 1.18.
+func (nopTestDeps) ResetCoverage() {}
+
+// Note: SnapshotCoverage was added in Go 1.18.
+func (nopTestDeps) SnapshotCoverage() {}
diff --git a/testscript/exe_pre_go1.18.go b/testscript/exe_pre_go1.18.go
new file mode 100644
index 00000000..b859f467
--- /dev/null
+++ b/testscript/exe_pre_go1.18.go
@@ -0,0 +1,11 @@
+//go:build !go1.18
+
+package testscript
+
+import (
+	"testing"
+)
+
+func mainStart() *testing.M {
+	return testing.MainStart(nopTestDeps{}, nil, nil, nil)
+}