diff --git a/go.mod b/go.mod
index 55a6fd6..6a43ca2 100644
--- a/go.mod
+++ b/go.mod
@@ -3,12 +3,12 @@ module mvdan.cc/unparam
 go 1.22.0
 
 require (
-	github.com/rogpeppe/go-internal v1.12.0
-	golang.org/x/tools v0.25.0
+	github.com/rogpeppe/go-internal v1.13.2-0.20241226121412-a5dc8ff20d0a
+	golang.org/x/tools v0.26.0
 )
 
 require (
 	golang.org/x/mod v0.21.0 // indirect
 	golang.org/x/sync v0.8.0 // indirect
-	golang.org/x/sys v0.25.0 // indirect
+	golang.org/x/sys v0.26.0 // indirect
 )
diff --git a/go.sum b/go.sum
index 28f5a78..3959cf0 100644
--- a/go.sum
+++ b/go.sum
@@ -1,10 +1,10 @@
-github.com/rogpeppe/go-internal v1.12.0 h1:exVL4IDcn6na9z1rAb56Vxr+CgyK3nn3O+epU5NdKM8=
-github.com/rogpeppe/go-internal v1.12.0/go.mod h1:E+RYuTGaKKdloAfM02xzb0FW3Paa99yedzYV+kq4uf4=
+github.com/rogpeppe/go-internal v1.13.2-0.20241226121412-a5dc8ff20d0a h1:w3tdWGKbLGBPtR/8/oO74W6hmz0qE5q0z9aqSAewaaM=
+github.com/rogpeppe/go-internal v1.13.2-0.20241226121412-a5dc8ff20d0a/go.mod h1:S8kfXMp+yh77OxPD4fdM6YUknrZpQxLhvxzS4gDHENY=
 golang.org/x/mod v0.21.0 h1:vvrHzRwRfVKSiLrG+d4FMl/Qi4ukBCE6kZlTUkDYRT0=
 golang.org/x/mod v0.21.0/go.mod h1:6SkKJ3Xj0I0BrPOZoBy3bdMptDDU9oJrpohJ3eWZ1fY=
 golang.org/x/sync v0.8.0 h1:3NFvSEYkUoMifnESzZl15y791HH1qU2xm6eCJU5ZPXQ=
 golang.org/x/sync v0.8.0/go.mod h1:Czt+wKu1gCyEFDUtn0jG5QVvpJ6rzVqr5aXyt9drQfk=
-golang.org/x/sys v0.25.0 h1:r+8e+loiHxRqhXVl6ML1nO3l1+oFoWbnlu2Ehimmi34=
-golang.org/x/sys v0.25.0/go.mod h1:/VUhepiaJMQUp4+oa/7Zr1D23ma6VTLIYjOOTFZPUcA=
-golang.org/x/tools v0.25.0 h1:oFU9pkj/iJgs+0DT+VMHrx+oBKs/LJMV+Uvg78sl+fE=
-golang.org/x/tools v0.25.0/go.mod h1:/vtpO8WL1N9cQC3FN5zPqb//fRXskFHbLKk4OW1Q7rg=
+golang.org/x/sys v0.26.0 h1:KHjCJyddX0LoSTb3J+vWpupP9p0oznkqVk/IfjymZbo=
+golang.org/x/sys v0.26.0/go.mod h1:/VUhepiaJMQUp4+oa/7Zr1D23ma6VTLIYjOOTFZPUcA=
+golang.org/x/tools v0.26.0 h1:v/60pFQmzmT9ExmjDv2gGIfi3OqfKoEP6I5+umXlbnQ=
+golang.org/x/tools v0.26.0/go.mod h1:TPVVj70c7JJ3WCazhD8OdXcZg/og+b9+tH/KxylGwH0=
diff --git a/main.go b/main.go
index 08cca48..fb761f5 100644
--- a/main.go
+++ b/main.go
@@ -13,7 +13,7 @@ import (
 )
 
 var (
-	flagSet = flag.NewFlagSet("unparam", flag.ContinueOnError)
+	flagSet = flag.NewFlagSet("unparam", flag.ExitOnError)
 
 	tests    = flagSet.Bool("tests", false, "load tests too")
 	exported = flagSet.Bool("exported", false, "inspect exported functions")
@@ -21,30 +21,20 @@ var (
 )
 
 func main() {
-	os.Exit(main1())
-}
-
-func main1() int {
 	flagSet.Usage = func() {
 		fmt.Fprintln(os.Stderr, "usage: unparam [flags] [package ...]")
 		flagSet.PrintDefaults()
 	}
-	if err := flagSet.Parse(os.Args[1:]); err != nil {
-		if err != flag.ErrHelp {
-			fmt.Fprintln(os.Stderr, err)
-		}
-		return 1
-	}
+	flagSet.Parse(os.Args[1:])
 	warns, err := check.UnusedParams(*tests, *exported, *debug, flagSet.Args()...)
 	if err != nil {
 		fmt.Fprintln(os.Stderr, err)
-		return 1
+		os.Exit(1)
 	}
 	for _, warn := range warns {
 		fmt.Println(warn)
 	}
 	if len(warns) > 0 {
-		return 1
+		os.Exit(1)
 	}
-	return 0
 }
diff --git a/main_test.go b/main_test.go
index a1b578a..ad5f492 100644
--- a/main_test.go
+++ b/main_test.go
@@ -10,9 +10,9 @@ import (
 )
 
 func TestMain(m *testing.M) {
-	os.Exit(testscript.RunMain(m, map[string]func() int{
-		"unparam": main1,
-	}))
+	testscript.Main(m, map[string]func(){
+		"unparam": main,
+	})
 }
 
 func TestScript(t *testing.T) {
diff --git a/testdata/script/cmds.txtar b/testdata/script/cmds.txtar
index fab1fb9..80f7ad6 100644
--- a/testdata/script/cmds.txtar
+++ b/testdata/script/cmds.txtar
@@ -1,4 +1,4 @@
-! exec unparam -h
+exec unparam -h
 stderr '^usage: unparam \[flags'
 ! stderr 'test\.' # don't include flags from testing
 ! stderr 'command not specified'