diff --git a/ast/character_literal_test.go b/ast/character_literal_test.go
index 2528ba9d1..d9a1ee36e 100644
--- a/ast/character_literal_test.go
+++ b/ast/character_literal_test.go
@@ -3,7 +3,6 @@ package ast
 import (
 	"fmt"
 	"github.com/elliotchance/c2go/cc"
-	"io/ioutil"
 	"os"
 	"path"
 	"testing"
@@ -347,14 +346,14 @@ func TestCharacterLiteralRepairFromSource(t *testing.T) {
 
 func prepareRepairFromSourceTest(t *testing.T, fileContent string, test func(filePath string)) {
 	cc.ResetCache()
-	dir, err := ioutil.TempDir("", "c2go")
+	dir, err := os.MkdirTemp("", "c2go")
 	if err != nil {
 		t.Fatal(fmt.Errorf("Cannot create temp folder: %v", err))
 	}
 	defer os.RemoveAll(dir) // clean up
 
 	ppFilePath := path.Join(dir, "pp.c")
-	err = ioutil.WriteFile(ppFilePath, []byte(fileContent), 0644)
+	err = os.WriteFile(ppFilePath, []byte(fileContent), 0644)
 	if err != nil {
 		t.Fatal(fmt.Errorf("writing to %s failed: %v", ppFilePath, err))
 	}
diff --git a/cc/preprocessor.go b/cc/preprocessor.go
index 63df0a12a..3b72cda54 100644
--- a/cc/preprocessor.go
+++ b/cc/preprocessor.go
@@ -2,7 +2,7 @@ package cc
 
 import (
 	"fmt"
-	"io/ioutil"
+	"os"
 	"strings"
 
 	"github.com/elliotchance/c2go/util"
@@ -26,7 +26,7 @@ func GetLineFromPreprocessedFile(inputFilePath, filePath string, lineNumber int)
 	if fileCache == nil {
 		fileCache = map[string]map[int]string{}
 
-		inputFile, err := ioutil.ReadFile(inputFilePath)
+		inputFile, err := os.ReadFile(inputFilePath)
 		if err != nil {
 			return "", err
 		}
diff --git a/main.go b/main.go
index afb31e1dd..a4824c496 100644
--- a/main.go
+++ b/main.go
@@ -14,7 +14,6 @@ import (
 	"flag"
 	"fmt"
 	"io"
-	"io/ioutil"
 	"os"
 	"os/exec"
 	"path"
@@ -198,14 +197,14 @@ func Start(args ProgramArgs) (err error) {
 	if args.verbose {
 		fmt.Println("Writing preprocessor ...")
 	}
-	dir, err := ioutil.TempDir("", "c2go")
+	dir, err := os.MkdirTemp("", "c2go")
 	if err != nil {
 		return fmt.Errorf("Cannot create temp folder: %v", err)
 	}
 	defer os.RemoveAll(dir) // clean up
 
 	ppFilePath := path.Join(dir, "pp.c")
-	err = ioutil.WriteFile(ppFilePath, pp, 0644)
+	err = os.WriteFile(ppFilePath, pp, 0644)
 	if err != nil {
 		return fmt.Errorf("writing to %s failed: %v", ppFilePath, err)
 	}
@@ -304,7 +303,7 @@ func Start(args ProgramArgs) (err error) {
 	if args.verbose {
 		fmt.Println("Writing the output Go code...")
 	}
-	err = ioutil.WriteFile(outputFilePath, []byte(p.String()), 0644)
+	err = os.WriteFile(outputFilePath, []byte(p.String()), 0644)
 	if err != nil {
 		return fmt.Errorf("writing Go output file failed: %v", err)
 	}
diff --git a/noarch/stdio.go b/noarch/stdio.go
index 06f348f87..cc318de47 100644
--- a/noarch/stdio.go
+++ b/noarch/stdio.go
@@ -3,7 +3,6 @@ package noarch
 import (
 	"fmt"
 	"io"
-	"io/ioutil"
 	"os"
 	"reflect"
 	"strings"
@@ -231,7 +230,7 @@ func Fputs(str *byte, stream *File) int32 {
 // abnormally, whether the file is deleted depends on the specific system and
 // library implementation.
 func Tmpfile() *File {
-	f, err := ioutil.TempFile("", "")
+	f, err := os.CreateTemp("", "")
 	if err != nil {
 		return nil
 	}
@@ -396,7 +395,7 @@ func Tmpnam(str *byte) *byte {
 	// great distinct Go temp file generation (that also checks for existing
 	// files), but unfortunately creates the file in the process; even if you
 	// don't intend to use it.
-	f, err := ioutil.TempFile("", "")
+	f, err := os.CreateTemp("", "")
 	if err != nil {
 		return nil
 	}
diff --git a/preprocessor/preprocessor.go b/preprocessor/preprocessor.go
index 2752fb556..f78a53090 100644
--- a/preprocessor/preprocessor.go
+++ b/preprocessor/preprocessor.go
@@ -4,7 +4,6 @@ import (
 	"bufio"
 	"bytes"
 	"fmt"
-	"io/ioutil"
 	"os"
 	"os/exec"
 	"path/filepath"
@@ -212,7 +211,7 @@ func analyzeFiles(inputFiles, clangFlags []string, verbose bool) (items []entity
 // clang -E <file>    Run the preprocessor stage.
 func getPreprocessSources(inputFiles, clangFlags []string, verbose bool) (out bytes.Buffer, err error) {
 	// get temp dir
-	dir, err := ioutil.TempDir("", "c2go-union")
+	dir, err := os.MkdirTemp("", "c2go-union")
 	if err != nil {
 		return
 	}
@@ -233,7 +232,7 @@ func getPreprocessSources(inputFiles, clangFlags []string, verbose bool) (out by
 	}
 
 	// write a union file
-	err = ioutil.WriteFile(unionFileName, []byte(unionBody), 0644)
+	err = os.WriteFile(unionFileName, []byte(unionBody), 0644)
 	if err != nil {
 		return
 	}