diff --git a/metropolis/node/build/genosrelease/main.go b/metropolis/node/build/genosrelease/main.go
index ad6e3e2..adb8202 100644
--- a/metropolis/node/build/genosrelease/main.go
+++ b/metropolis/node/build/genosrelease/main.go
@@ -23,7 +23,6 @@
 import (
 	"flag"
 	"fmt"
-	"io/ioutil"
 	"os"
 	"strings"
 
@@ -40,7 +39,7 @@
 
 func main() {
 	flag.Parse()
-	statusFileContent, err := ioutil.ReadFile(*flagStatusFile)
+	statusFileContent, err := os.ReadFile(*flagStatusFile)
 	if err != nil {
 		fmt.Printf("Failed to open bazel workspace status file: %v\n", err)
 		os.Exit(1)
@@ -73,7 +72,7 @@
 		fmt.Printf("Failed to encode os-release file: %v\n", err)
 		os.Exit(1)
 	}
-	if err := ioutil.WriteFile(*flagOutFile, []byte(osReleaseContent), 0644); err != nil {
+	if err := os.WriteFile(*flagOutFile, []byte(osReleaseContent), 0644); err != nil {
 		fmt.Printf("Failed to write os-release file: %v\n", err)
 		os.Exit(1)
 	}
diff --git a/metropolis/node/build/mkerofs/main.go b/metropolis/node/build/mkerofs/main.go
index ea89d67..d4e9d4d 100644
--- a/metropolis/node/build/mkerofs/main.go
+++ b/metropolis/node/build/mkerofs/main.go
@@ -22,7 +22,6 @@
 import (
 	"flag"
 	"io"
-	"io/ioutil"
 	"log"
 	"os"
 	"path"
@@ -132,7 +131,7 @@
 
 func main() {
 	flag.Parse()
-	specRaw, err := ioutil.ReadFile(*specPath)
+	specRaw, err := os.ReadFile(*specPath)
 	if err != nil {
 		log.Fatalf("failed to open spec: %v", err)
 	}
diff --git a/metropolis/node/build/mkimage/osimage/osimage.go b/metropolis/node/build/mkimage/osimage/osimage.go
index 4ad2d5f..2f000a6 100644
--- a/metropolis/node/build/mkimage/osimage/osimage.go
+++ b/metropolis/node/build/mkimage/osimage/osimage.go
@@ -21,7 +21,6 @@
 import (
 	"fmt"
 	"io"
-	"io/ioutil"
 	"os"
 
 	diskfs "github.com/diskfs/go-diskfs"
@@ -58,7 +57,7 @@
 	// If this is streamed (e.g. using io.Copy) it exposes a bug in diskfs, so
 	// do it in one go.
 	// TODO(mateusz@monogon.tech): Investigate the bug.
-	data, err := ioutil.ReadAll(src)
+	data, err := io.ReadAll(src)
 	if err != nil {
 		return fmt.Errorf("while reading %q: %w", src, err)
 	}