diff --git a/metropolis/pkg/fileargs/fileargs.go b/metropolis/pkg/fileargs/fileargs.go
index bec8fca..88863da 100644
--- a/metropolis/pkg/fileargs/fileargs.go
+++ b/metropolis/pkg/fileargs/fileargs.go
@@ -21,7 +21,6 @@
 	"encoding/hex"
 	"fmt"
 	"io"
-	"io/ioutil"
 	"os"
 	"path/filepath"
 
@@ -78,7 +77,7 @@
 
 	path := filepath.Join(f.path, name)
 
-	if err := ioutil.WriteFile(path, content, 0600); err != nil {
+	if err := os.WriteFile(path, content, 0600); err != nil {
 		f.lastError = err
 		return ""
 	}