diff --git a/clidocstool_md.go b/clidocstool_md.go
index e58aada..55cb38d 100644
--- a/clidocstool_md.go
+++ b/clidocstool_md.go
@@ -17,7 +17,6 @@ package clidocstool
 import (
 	"bytes"
 	"fmt"
-	"io/ioutil"
 	"log"
 	"os"
 	"path/filepath"
@@ -82,14 +81,14 @@ func (c *Client) GenMarkdownTree(cmd *cobra.Command) error {
 		}); err != nil {
 			return err
 		}
-		if err = ioutil.WriteFile(targetPath, icBuf.Bytes(), 0644); err != nil {
+		if err = os.WriteFile(targetPath, icBuf.Bytes(), 0644); err != nil {
 			return err
 		}
 	} else if err := copyFile(sourcePath, targetPath); err != nil {
 		return err
 	}
 
-	content, err := ioutil.ReadFile(targetPath)
+	content, err := os.ReadFile(targetPath)
 	if err != nil {
 		return err
 	}
@@ -116,7 +115,7 @@ func (c *Client) GenMarkdownTree(cmd *cobra.Command) error {
 	if err != nil {
 		return err
 	}
-	if err = ioutil.WriteFile(targetPath, []byte(cont), fi.Mode()); err != nil {
+	if err = os.WriteFile(targetPath, []byte(cont), fi.Mode()); err != nil {
 		return fmt.Errorf("failed to write %s: %w", targetPath, err)
 	}
 
diff --git a/clidocstool_md_test.go b/clidocstool_md_test.go
index afc3828..ec2c970 100644
--- a/clidocstool_md_test.go
+++ b/clidocstool_md_test.go
@@ -15,7 +15,6 @@
 package clidocstool
 
 import (
-	"io/ioutil"
 	"os"
 	"path"
 	"path/filepath"
@@ -27,11 +26,9 @@ import (
 
 //nolint:errcheck
 func TestGenMarkdownTree(t *testing.T) {
-	tmpdir, err := ioutil.TempDir("", "test-gen-markdown-tree")
-	require.NoError(t, err)
-	defer os.RemoveAll(tmpdir)
+	tmpdir := t.TempDir()
 
-	err = copyFile(path.Join("fixtures", "buildx_stop.pre.md"), path.Join(tmpdir, "buildx_stop.md"))
+	err := copyFile(path.Join("fixtures", "buildx_stop.pre.md"), path.Join(tmpdir, "buildx_stop.md"))
 	require.NoError(t, err)
 
 	c, err := New(Options{
@@ -45,12 +42,10 @@ func TestGenMarkdownTree(t *testing.T) {
 	for _, tt := range []string{"buildx.md", "buildx_build.md", "buildx_stop.md"} {
 		tt := tt
 		t.Run(tt, func(t *testing.T) {
-			fres := filepath.Join(tmpdir, tt)
-			require.FileExists(t, fres)
-			bres, err := ioutil.ReadFile(fres)
+			bres, err := os.ReadFile(filepath.Join(tmpdir, tt))
 			require.NoError(t, err)
 
-			bexc, err := ioutil.ReadFile(path.Join("fixtures", tt))
+			bexc, err := os.ReadFile(path.Join("fixtures", tt))
 			require.NoError(t, err)
 			assert.Equal(t, string(bexc), string(bres))
 		})
diff --git a/clidocstool_test.go b/clidocstool_test.go
index 36695f1..2c50733 100644
--- a/clidocstool_test.go
+++ b/clidocstool_test.go
@@ -15,7 +15,6 @@
 package clidocstool
 
 import (
-	"io/ioutil"
 	"os"
 	"path"
 	"path/filepath"
@@ -176,11 +175,9 @@ func init() {
 
 //nolint:errcheck
 func TestGenAllTree(t *testing.T) {
-	tmpdir, err := ioutil.TempDir("", "test-gen-all-tree")
-	require.NoError(t, err)
-	defer os.RemoveAll(tmpdir)
+	tmpdir := t.TempDir()
 
-	err = copyFile(path.Join("fixtures", "buildx_stop.pre.md"), path.Join(tmpdir, "buildx_stop.md"))
+	err := copyFile(path.Join("fixtures", "buildx_stop.pre.md"), path.Join(tmpdir, "buildx_stop.md"))
 	require.NoError(t, err)
 
 	c, err := New(Options{
@@ -194,12 +191,10 @@ func TestGenAllTree(t *testing.T) {
 	for _, tt := range []string{"buildx.md", "buildx_build.md", "buildx_stop.md", "docker_buildx.yaml", "docker_buildx_build.yaml", "docker_buildx_stop.yaml"} {
 		tt := tt
 		t.Run(tt, func(t *testing.T) {
-			fres := filepath.Join(tmpdir, tt)
-			require.FileExists(t, fres)
-			bres, err := ioutil.ReadFile(fres)
+			bres, err := os.ReadFile(filepath.Join(tmpdir, tt))
 			require.NoError(t, err)
 
-			bexc, err := ioutil.ReadFile(path.Join("fixtures", tt))
+			bexc, err := os.ReadFile(path.Join("fixtures", tt))
 			require.NoError(t, err)
 			assert.Equal(t, string(bexc), string(bres))
 		})
diff --git a/clidocstool_yaml.go b/clidocstool_yaml.go
index e945f9d..dfccfca 100644
--- a/clidocstool_yaml.go
+++ b/clidocstool_yaml.go
@@ -17,7 +17,6 @@ package clidocstool
 import (
 	"fmt"
 	"io"
-	"io/ioutil"
 	"log"
 	"os"
 	"path/filepath"
@@ -388,7 +387,7 @@ func (c *Client) loadLongDescription(parentCmd *cobra.Command) error {
 		}
 		mdFile := strings.ReplaceAll(name, " ", "_") + ".md"
 		sourcePath := filepath.Join(c.source, mdFile)
-		content, err := ioutil.ReadFile(sourcePath)
+		content, err := os.ReadFile(sourcePath)
 		if os.IsNotExist(err) {
 			log.Printf("WARN: %s does not exist, skipping Markdown examples for YAML doc\n", mdFile)
 			continue
diff --git a/clidocstool_yaml_test.go b/clidocstool_yaml_test.go
index 77a268a..a5892c0 100644
--- a/clidocstool_yaml_test.go
+++ b/clidocstool_yaml_test.go
@@ -15,7 +15,6 @@
 package clidocstool
 
 import (
-	"io/ioutil"
 	"os"
 	"path"
 	"path/filepath"
@@ -27,9 +26,7 @@ import (
 
 //nolint:errcheck
 func TestGenYamlTree(t *testing.T) {
-	tmpdir, err := ioutil.TempDir("", "test-gen-yaml-tree")
-	require.NoError(t, err)
-	defer os.RemoveAll(tmpdir)
+	tmpdir := t.TempDir()
 
 	c, err := New(Options{
 		Root:      buildxCmd,
@@ -42,12 +39,10 @@ func TestGenYamlTree(t *testing.T) {
 	for _, tt := range []string{"docker_buildx.yaml", "docker_buildx_build.yaml", "docker_buildx_stop.yaml"} {
 		tt := tt
 		t.Run(tt, func(t *testing.T) {
-			fres := filepath.Join(tmpdir, tt)
-			require.FileExists(t, fres)
-			bres, err := ioutil.ReadFile(fres)
+			bres, err := os.ReadFile(filepath.Join(tmpdir, tt))
 			require.NoError(t, err)
 
-			bexc, err := ioutil.ReadFile(path.Join("fixtures", tt))
+			bexc, err := os.ReadFile(path.Join("fixtures", tt))
 			require.NoError(t, err)
 			assert.Equal(t, string(bexc), string(bres))
 		})