diff --git a/.github/workflows/golangci-lint.yml b/.github/workflows/golangci-lint.yml
index e03394c..c69b774 100644
--- a/.github/workflows/golangci-lint.yml
+++ b/.github/workflows/golangci-lint.yml
@@ -18,5 +18,5 @@ jobs:
       - name: golangci-lint
         uses: golangci/golangci-lint-action@v2
         with:
-          version: v1.55.2
+          version: v1.57.2
 
diff --git a/cmd/puku/puku.go b/cmd/puku/puku.go
index 8e447a2..413740c 100644
--- a/cmd/puku/puku.go
+++ b/cmd/puku/puku.go
@@ -1,7 +1,6 @@
 package main
 
 import (
-	"fmt"
 	"os"
 	"path/filepath"
 
@@ -21,19 +20,6 @@ import (
 	"github.com/please-build/puku/work"
 )
 
-type outputFormat string
-
-// UnmarshalFlag implements the flags.Unmarshaler interface.
-func (f *outputFormat) UnmarshalFlag(in string) error {
-	switch in {
-	case "json", "text":
-		*f = outputFormat(in)
-	default:
-		return fmt.Errorf("Flags error: Output format unrecognised")
-	}
-	return nil
-}
-
 var opts = struct {
 	Usage     string
 	Verbosity clilogging.Verbosity `short:"v" long:"verbosity" description:"Verbosity of output (error, warning, notice, info, debug)" default:"info"`
@@ -99,7 +85,7 @@ var funcs = map[string]func(conf *config.Config, plzConf *please.Config, orignal
 				log.Fatalf("%v", err)
 			}
 		} else {
-			if err := sync.SyncToStdout(string(opts.Sync.Format), plzConf, g); err != nil {
+			if err := sync.SyncToStdout(opts.Sync.Format, plzConf, g); err != nil {
 				log.Fatalf("%v", err)
 			}
 		}
@@ -108,7 +94,7 @@ var funcs = map[string]func(conf *config.Config, plzConf *please.Config, orignal
 	"lint": func(conf *config.Config, plzConf *please.Config, orignalWD string) int {
 
 		paths := work.MustExpandPaths(orignalWD, opts.Lint.Args.Paths)
-		if err := generate.UpdateToStdout(string(opts.Lint.Format), plzConf, paths...); err != nil {
+		if err := generate.UpdateToStdout(opts.Lint.Format, plzConf, paths...); err != nil {
 			log.Fatalf("%v", err)
 		}
 		return 0
@@ -135,7 +121,7 @@ var funcs = map[string]func(conf *config.Config, plzConf *please.Config, orignal
 				log.Fatalf("%v", err)
 			}
 		} else {
-			if err := migrate.MigrateToStdout(string(opts.Migrate.Format), conf, plzConf, opts.Migrate.UpdateGoMod, opts.Migrate.Args.Modules, paths); err != nil {
+			if err := migrate.MigrateToStdout(opts.Migrate.Format, conf, plzConf, opts.Migrate.UpdateGoMod, opts.Migrate.Args.Modules, paths); err != nil {
 				log.Fatalf("%v", err)
 			}
 		}
@@ -149,7 +135,7 @@ var funcs = map[string]func(conf *config.Config, plzConf *please.Config, orignal
 				log.Fatalf("%v", err)
 			}
 		} else {
-			if err := l.UpdateToStdout(string(opts.Licenses.Update.Format), paths); err != nil {
+			if err := l.UpdateToStdout(opts.Licenses.Update.Format, paths); err != nil {
 				log.Fatalf("%v", err)
 			}
 		}
diff --git a/licences/licences.go b/licences/licences.go
index 5105414..04eb6a2 100644
--- a/licences/licences.go
+++ b/licences/licences.go
@@ -68,12 +68,16 @@ func getLicences(modPaths []string) (map[string][]string, error) {
 }
 
 func (l *Licenses) Update(paths []string) error {
-	l.update(paths)
+	if err := l.update(paths); err != nil {
+		return err
+	}
 	return l.graph.FormatFiles()
 }
 
 func (l *Licenses) UpdateToStdout(format string, paths []string) error {
-	l.update(paths)
+	if err := l.update(paths); err != nil {
+		return err
+	}
 	return l.graph.FormatFilesWithWriter(os.Stdout, format)
 }
 
diff --git a/migrate/migrate.go b/migrate/migrate.go
index cc1d4f5..4468faf 100644
--- a/migrate/migrate.go
+++ b/migrate/migrate.go
@@ -48,7 +48,6 @@ func Migrate(conf *config.Config, plzConf *please.Config, updateGoMod bool, modu
 		return err
 	}
 	return m.graph.FormatFiles()
-
 }
 
 func MigrateToStdout(format string, conf *config.Config, plzConf *please.Config, updateGoMod bool, modules, paths []string) error {
diff --git a/sync/sync.go b/sync/sync.go
index db712bc..56e0ff2 100644
--- a/sync/sync.go
+++ b/sync/sync.go
@@ -43,6 +43,7 @@ func Sync(plzConf *please.Config, g *graph.Graph) error {
 	return s.graph.FormatFiles()
 }
 
+// SyncToStdout constructs the syncer and outputs the synced build file to stdout.
 func SyncToStdout(format string, plzConf *please.Config, g *graph.Graph) error {
 	s := newSyncer(plzConf, g)
 	if err := s.sync(); err != nil {