diff --git a/bmp/writer_test.go b/bmp/writer_test.go
index 8b573a87..7eb86c10 100644
--- a/bmp/writer_test.go
+++ b/bmp/writer_test.go
@@ -9,7 +9,7 @@ import (
 	"fmt"
 	"image"
 	"image/draw"
-	"io/ioutil"
+	"io"
 	"os"
 	"testing"
 	"time"
@@ -138,6 +138,6 @@ func BenchmarkEncode(b *testing.B) {
 	b.SetBytes(int64(s.X * s.Y * 4))
 	b.ResetTimer()
 	for i := 0; i < b.N; i++ {
-		Encode(ioutil.Discard, img)
+		Encode(io.Discard, img)
 	}
 }
diff --git a/ccitt/gen.go b/ccitt/gen.go
index bf8aa7fe..c6542c71 100644
--- a/ccitt/gen.go
+++ b/ccitt/gen.go
@@ -12,7 +12,6 @@ import (
 	"flag"
 	"fmt"
 	"go/format"
-	"io/ioutil"
 	"log"
 	"os"
 )
@@ -264,15 +263,15 @@ func finish(w *bytes.Buffer, filename string) {
 	if err != nil {
 		log.Fatalf("format.Source: %v", err)
 	}
-	if err := ioutil.WriteFile(filename, out, 0660); err != nil {
-		log.Fatalf("ioutil.WriteFile: %v", err)
+	if err := os.WriteFile(filename, out, 0660); err != nil {
+		log.Fatalf("os.WriteFile: %v", err)
 	}
 }
 
 func copyPaste(w *bytes.Buffer, filename string) {
-	b, err := ioutil.ReadFile("gen.go")
+	b, err := os.ReadFile("gen.go")
 	if err != nil {
-		log.Fatalf("ioutil.ReadFile: %v", err)
+		log.Fatalf("os.ReadFile: %v", err)
 	}
 	begin := []byte("\n// COPY PASTE " + filename + " BEGIN\n\n")
 	end := []byte("\n// COPY PASTE " + filename + " END\n\n")
diff --git a/ccitt/reader_test.go b/ccitt/reader_test.go
index 8de1c3d4..2ed8c37b 100644
--- a/ccitt/reader_test.go
+++ b/ccitt/reader_test.go
@@ -10,7 +10,6 @@ import (
 	"image"
 	"image/png"
 	"io"
-	"io/ioutil"
 	"math/rand"
 	"os"
 	"path/filepath"
@@ -301,7 +300,7 @@ func testRead(t *testing.T, fileName string, sf SubFormat, align, invert, trunca
 			t.Fatalf("Open: %v", err)
 		}
 		defer f.Close()
-		gotBytes, err := ioutil.ReadAll(NewReader(f, MSB, sf, width, height, opts))
+		gotBytes, err := io.ReadAll(NewReader(f, MSB, sf, width, height, opts))
 		if err != nil {
 			t.Fatalf("ReadAll: %v", err)
 		}
@@ -382,7 +381,7 @@ func testRead(t *testing.T, fileName string, sf SubFormat, align, invert, trunca
 			t.Fatalf("Open: %v", err)
 		}
 		defer f.Close()
-		adhBytes, err := ioutil.ReadAll(NewReader(f, MSB, sf, width, AutoDetectHeight, opts))
+		adhBytes, err := io.ReadAll(NewReader(f, MSB, sf, width, AutoDetectHeight, opts))
 		if err != nil {
 			t.Fatalf("ReadAll: %v", err)
 		}
diff --git a/colornames/gen.go b/colornames/gen.go
index f0c2ea0d..1aa7e5f2 100644
--- a/colornames/gen.go
+++ b/colornames/gen.go
@@ -15,9 +15,9 @@ import (
 	"go/format"
 	"image/color"
 	"io"
-	"io/ioutil"
 	"log"
 	"net/http"
+	"os"
 	"regexp"
 	"sort"
 	"strconv"
@@ -192,7 +192,7 @@ func main() {
 		log.Fatalf("Error while formatting code: %s\n", err)
 	}
 
-	if err := ioutil.WriteFile("table.go", fmted, 0644); err != nil {
+	if err := os.WriteFile("table.go", fmted, 0644); err != nil {
 		log.Fatalf("Error writing table.go: %s\n", err)
 	}
 }
diff --git a/draw/gen.go b/draw/gen.go
index 33678ad7..2f18b0e5 100644
--- a/draw/gen.go
+++ b/draw/gen.go
@@ -12,7 +12,6 @@ import (
 	"flag"
 	"fmt"
 	"go/format"
-	"io/ioutil"
 	"log"
 	"os"
 	"strings"
@@ -45,7 +44,7 @@ func main() {
 	if err != nil {
 		log.Fatal(err)
 	}
-	if err := ioutil.WriteFile("impl.go", out, 0660); err != nil {
+	if err := os.WriteFile("impl.go", out, 0660); err != nil {
 		log.Fatal(err)
 	}
 }
diff --git a/example/font/main.go b/example/font/main.go
index aee01a43..109d1bab 100644
--- a/example/font/main.go
+++ b/example/font/main.go
@@ -18,7 +18,6 @@ import (
 	"image/color"
 	"image/draw"
 	"image/png"
-	"io/ioutil"
 	"log"
 	"os"
 	"path/filepath"
@@ -52,19 +51,19 @@ func main() {
 	}
 	var face font.Face
 	if strings.HasSuffix(*fontFlag, ".font") {
-		fontData, err := ioutil.ReadFile(*fontFlag)
+		fontData, err := os.ReadFile(*fontFlag)
 		if err != nil {
 			log.Fatal(err)
 		}
 		dir := filepath.Dir(*fontFlag)
 		face, err = plan9font.ParseFont(fontData, func(name string) ([]byte, error) {
-			return ioutil.ReadFile(filepath.Join(dir, filepath.FromSlash(name)))
+			return os.ReadFile(filepath.Join(dir, filepath.FromSlash(name)))
 		})
 		if err != nil {
 			log.Fatal(err)
 		}
 	} else {
-		fontData, err := ioutil.ReadFile(*fontFlag)
+		fontData, err := os.ReadFile(*fontFlag)
 		if err != nil {
 			log.Fatal(err)
 		}
diff --git a/font/basicfont/gen.go b/font/basicfont/gen.go
index fa25e60b..f576eec7 100644
--- a/font/basicfont/gen.go
+++ b/font/basicfont/gen.go
@@ -14,8 +14,8 @@ import (
 	"go/format"
 	"image"
 	"image/draw"
-	"io/ioutil"
 	"log"
+	"os"
 	"path"
 	"path/filepath"
 
@@ -34,7 +34,7 @@ func main() {
 	const width, height, ascent = 7 - 1, 13, 11
 
 	readFile := func(name string) ([]byte, error) {
-		return ioutil.ReadFile(filepath.FromSlash(path.Join("../testdata/fixed", name)))
+		return os.ReadFile(filepath.FromSlash(path.Join("../testdata/fixed", name)))
 	}
 	fontData, err := readFile("unicode.7x13.font")
 	if err != nil {
@@ -98,8 +98,8 @@ func main() {
 	if err != nil {
 		log.Fatalf("format.Source: %v", err)
 	}
-	if err := ioutil.WriteFile("data.go", fmted, 0644); err != nil {
-		log.Fatalf("ioutil.WriteFile: %v", err)
+	if err := os.WriteFile("data.go", fmted, 0644); err != nil {
+		log.Fatalf("os.WriteFile: %v", err)
 	}
 }
 
diff --git a/font/gofont/gen.go b/font/gofont/gen.go
index bb867a4e..aa1edb18 100644
--- a/font/gofont/gen.go
+++ b/font/gofont/gen.go
@@ -21,7 +21,6 @@ import (
 	"bytes"
 	"fmt"
 	"go/format"
-	"io/ioutil"
 	"log"
 	"os"
 	"path/filepath"
@@ -56,7 +55,7 @@ func do(ttfName string) {
 	if err := os.Mkdir(pkgName, 0777); err != nil && !os.IsExist(err) {
 		log.Fatal(err)
 	}
-	src, err := ioutil.ReadFile(filepath.Join("ttfs", ttfName))
+	src, err := os.ReadFile(filepath.Join("ttfs", ttfName))
 	if err != nil {
 		log.Fatal(err)
 	}
@@ -87,7 +86,7 @@ func do(ttfName string) {
 	if err != nil {
 		log.Fatal(err)
 	}
-	if err := ioutil.WriteFile(filepath.Join(pkgName, "data.go"), dst, 0666); err != nil {
+	if err := os.WriteFile(filepath.Join(pkgName, "data.go"), dst, 0666); err != nil {
 		log.Fatal(err)
 	}
 }
diff --git a/font/plan9font/example_test.go b/font/plan9font/example_test.go
index c3e8f891..3d1c0727 100644
--- a/font/plan9font/example_test.go
+++ b/font/plan9font/example_test.go
@@ -7,7 +7,6 @@ package plan9font_test
 import (
 	"image"
 	"image/draw"
-	"io/ioutil"
 	"log"
 	"os"
 	"path"
@@ -20,7 +19,7 @@ import (
 
 func ExampleParseFont() {
 	readFile := func(name string) ([]byte, error) {
-		return ioutil.ReadFile(filepath.FromSlash(path.Join("../testdata/fixed", name)))
+		return os.ReadFile(filepath.FromSlash(path.Join("../testdata/fixed", name)))
 	}
 	fontData, err := readFile("unicode.7x13.font")
 	if err != nil {
diff --git a/font/plan9font/plan9font.go b/font/plan9font/plan9font.go
index 27390599..f0d95e6f 100644
--- a/font/plan9font/plan9font.go
+++ b/font/plan9font/plan9font.go
@@ -247,7 +247,7 @@ func (f *face) subface(r rune) (*subface, rune) {
 
 // ParseFont parses a Plan 9 font file. data is the contents of that font file,
 // which gives relative filenames for subfont files. readFile returns the
-// contents of those subfont files. It is similar to io/ioutil's ReadFile
+// contents of those subfont files. It is similar to os's ReadFile
 // function, except that it takes a relative filename instead of an absolute
 // one.
 func ParseFont(data []byte, readFile func(relFilename string) ([]byte, error)) (font.Face, error) {
diff --git a/font/plan9font/plan9font_test.go b/font/plan9font/plan9font_test.go
index 573f63b9..3d592796 100644
--- a/font/plan9font/plan9font_test.go
+++ b/font/plan9font/plan9font_test.go
@@ -6,7 +6,7 @@ package plan9font
 
 import (
 	"image"
-	"io/ioutil"
+	"os"
 	"path"
 	"path/filepath"
 	"testing"
@@ -16,7 +16,7 @@ import (
 
 func TestMetrics(t *testing.T) {
 	readFile := func(name string) ([]byte, error) {
-		return ioutil.ReadFile(filepath.FromSlash(path.Join("../testdata/fixed", name)))
+		return os.ReadFile(filepath.FromSlash(path.Join("../testdata/fixed", name)))
 	}
 	data, err := readFile("unicode.7x13.font")
 	if err != nil {
@@ -45,7 +45,7 @@ func TestMetrics(t *testing.T) {
 }
 
 func BenchmarkParseSubfont(b *testing.B) {
-	subfontData, err := ioutil.ReadFile(filepath.FromSlash("../testdata/fixed/7x13.0000"))
+	subfontData, err := os.ReadFile(filepath.FromSlash("../testdata/fixed/7x13.0000"))
 	if err != nil {
 		b.Fatal(err)
 	}
diff --git a/font/sfnt/gen.go b/font/sfnt/gen.go
index 1708ce9b..ecac1734 100644
--- a/font/sfnt/gen.go
+++ b/font/sfnt/gen.go
@@ -11,7 +11,6 @@ import (
 	"bytes"
 	"fmt"
 	"go/format"
-	"io/ioutil"
 	"log"
 )
 
@@ -53,8 +52,8 @@ func main() {
 	if err != nil {
 		log.Fatalf("format.Source: %v\n\n----\n%s\n----", err, dstUnformatted)
 	}
-	if err := ioutil.WriteFile("data.go", dst, 0666); err != nil {
-		log.Fatalf("ioutil.WriteFile: %v", err)
+	if err := os.WriteFile("data.go", dst, 0666); err != nil {
+		log.Fatalf("os.WriteFile: %v", err)
 	}
 }
 
diff --git a/font/sfnt/kern_test.go b/font/sfnt/kern_test.go
index 163dac70..eb65eb1e 100644
--- a/font/sfnt/kern_test.go
+++ b/font/sfnt/kern_test.go
@@ -24,7 +24,6 @@ go test golang.org/x/image/font/sfnt -test.run=BulkKern -args -bulk -bulkFontDir
 
 import (
 	"flag"
-	"io/ioutil"
 	"log"
 	"os"
 	"path/filepath"
@@ -78,7 +77,7 @@ func TestBulkKern(t *testing.T) {
 func testFontKerning(fname string) func(*testing.T) {
 	return func(t *testing.T) {
 		t.Parallel()
-		b, err := ioutil.ReadFile(fname)
+		b, err := os.ReadFile(fname)
 		if err != nil {
 			t.Fatal(err)
 		}
diff --git a/font/sfnt/proprietary_test.go b/font/sfnt/proprietary_test.go
index 15dde75d..1e95e8c3 100644
--- a/font/sfnt/proprietary_test.go
+++ b/font/sfnt/proprietary_test.go
@@ -36,7 +36,7 @@ go test golang.org/x/image/font/sfnt -test.run=ProprietaryMicrosoft -args -propr
 import (
 	"errors"
 	"flag"
-	"io/ioutil"
+	"os"
 	"path/filepath"
 	"strconv"
 	"strings"
@@ -250,7 +250,7 @@ func testProprietary(t *testing.T, proprietor, filename string, minNumGlyphs, fi
 	default:
 		panic("unreachable")
 	}
-	file, err := ioutil.ReadFile(filepath.Join(dir, basename))
+	file, err := os.ReadFile(filepath.Join(dir, basename))
 	if err != nil {
 		t.Fatalf("%v\nPerhaps you need to set the -%sDir flag?", err, proprietor)
 	}
diff --git a/font/sfnt/sfnt.go b/font/sfnt/sfnt.go
index d693886d..26e7e862 100644
--- a/font/sfnt/sfnt.go
+++ b/font/sfnt/sfnt.go
@@ -209,7 +209,7 @@ func u32(b []byte) uint32 {
 // source is a source of byte data. Conceptually, it is like an io.ReaderAt,
 // except that a common source of SFNT font data is in-memory instead of
 // on-disk: a []byte containing the entire data, either as a global variable
-// (e.g. "goregular.TTF") or the result of an ioutil.ReadFile call. In such
+// (e.g. "goregular.TTF") or the result of an os.ReadFile call. In such
 // cases, as an optimization, we skip the io.Reader / io.ReaderAt model of
 // copying from the source to a caller-supplied buffer, and instead provide
 // direct access to the underlying []byte data.
diff --git a/font/sfnt/sfnt_test.go b/font/sfnt/sfnt_test.go
index 53cc125f..c1689d69 100644
--- a/font/sfnt/sfnt_test.go
+++ b/font/sfnt/sfnt_test.go
@@ -8,7 +8,7 @@ import (
 	"bytes"
 	"fmt"
 	"image"
-	"io/ioutil"
+	"os"
 	"path/filepath"
 	"testing"
 
@@ -233,7 +233,7 @@ func TestBounds(t *testing.T) {
 }
 
 func TestMetrics(t *testing.T) {
-	cmapFont, err := ioutil.ReadFile(filepath.FromSlash("../testdata/cmapTest.ttf"))
+	cmapFont, err := os.ReadFile(filepath.FromSlash("../testdata/cmapTest.ttf"))
 	if err != nil {
 		t.Fatal(err)
 	}
@@ -467,7 +467,7 @@ func TestGoRegularGlyphIndex(t *testing.T) {
 }
 
 func TestGlyphIndex(t *testing.T) {
-	data, err := ioutil.ReadFile(filepath.FromSlash("../testdata/cmapTest.ttf"))
+	data, err := os.ReadFile(filepath.FromSlash("../testdata/cmapTest.ttf"))
 	if err != nil {
 		t.Fatal(err)
 	}
@@ -778,7 +778,7 @@ func TestTrueTypeSegments(t *testing.T) {
 }
 
 func testSegments(t *testing.T, filename string, wants [][]Segment) {
-	data, err := ioutil.ReadFile(filepath.FromSlash("../testdata/" + filename))
+	data, err := os.ReadFile(filepath.FromSlash("../testdata/" + filename))
 	if err != nil {
 		t.Fatalf("ReadFile: %v", err)
 	}
@@ -816,7 +816,7 @@ func testSegments(t *testing.T, filename string, wants [][]Segment) {
 }
 
 func TestPPEM(t *testing.T) {
-	data, err := ioutil.ReadFile(filepath.FromSlash("../testdata/glyfTest.ttf"))
+	data, err := os.ReadFile(filepath.FromSlash("../testdata/glyfTest.ttf"))
 	if err != nil {
 		t.Fatalf("ReadFile: %v", err)
 	}
@@ -870,7 +870,7 @@ func TestPPEM(t *testing.T) {
 }
 
 func TestPostInfo(t *testing.T) {
-	data, err := ioutil.ReadFile(filepath.FromSlash("../testdata/glyfTest.ttf"))
+	data, err := os.ReadFile(filepath.FromSlash("../testdata/glyfTest.ttf"))
 	if err != nil {
 		t.Fatalf("ReadFile: %v", err)
 	}
diff --git a/riff/example_test.go b/riff/example_test.go
index 93c72b09..94eb39f5 100644
--- a/riff/example_test.go
+++ b/riff/example_test.go
@@ -7,7 +7,6 @@ package riff_test
 import (
 	"fmt"
 	"io"
-	"io/ioutil"
 	"log"
 	"strings"
 
@@ -60,7 +59,7 @@ func dump(r *riff.Reader, indent string) error {
 			}
 			continue
 		}
-		b, err := ioutil.ReadAll(chunkData)
+		b, err := io.ReadAll(chunkData)
 		if err != nil {
 			return err
 		}
diff --git a/riff/riff.go b/riff/riff.go
index 38dc0e56..2af43e57 100644
--- a/riff/riff.go
+++ b/riff/riff.go
@@ -16,7 +16,6 @@ package riff // import "golang.org/x/image/riff"
 import (
 	"errors"
 	"io"
-	"io/ioutil"
 	"math"
 )
 
@@ -103,7 +102,7 @@ func (z *Reader) Next() (chunkID FourCC, chunkLen uint32, chunkData io.Reader, e
 	if z.chunkLen != 0 {
 		want := z.chunkLen
 		var got int64
-		got, z.err = io.Copy(ioutil.Discard, z.chunkReader)
+		got, z.err = io.Copy(io.Discard, z.chunkReader)
 		if z.err == nil && uint32(got) != want {
 			z.err = errShortChunkData
 		}
diff --git a/tiff/reader.go b/tiff/reader.go
index de73f4b9..621412a8 100644
--- a/tiff/reader.go
+++ b/tiff/reader.go
@@ -14,7 +14,6 @@ import (
 	"image"
 	"image/color"
 	"io"
-	"io/ioutil"
 	"math"
 
 	"golang.org/x/image/ccitt"
@@ -663,15 +662,15 @@ func Decode(r io.Reader) (img image.Image, err error) {
 				inv := d.firstVal(tPhotometricInterpretation) == pWhiteIsZero
 				order := ccittFillOrder(d.firstVal(tFillOrder))
 				r := ccitt.NewReader(io.NewSectionReader(d.r, offset, n), order, ccitt.Group3, blkW, blkH, &ccitt.Options{Invert: inv, Align: false})
-				d.buf, err = ioutil.ReadAll(r)
+				d.buf, err = io.ReadAll(r)
 			case cG4:
 				inv := d.firstVal(tPhotometricInterpretation) == pWhiteIsZero
 				order := ccittFillOrder(d.firstVal(tFillOrder))
 				r := ccitt.NewReader(io.NewSectionReader(d.r, offset, n), order, ccitt.Group4, blkW, blkH, &ccitt.Options{Invert: inv, Align: false})
-				d.buf, err = ioutil.ReadAll(r)
+				d.buf, err = io.ReadAll(r)
 			case cLZW:
 				r := lzw.NewReader(io.NewSectionReader(d.r, offset, n), lzw.MSB, 8)
-				d.buf, err = ioutil.ReadAll(r)
+				d.buf, err = io.ReadAll(r)
 				r.Close()
 			case cDeflate, cDeflateOld:
 				var r io.ReadCloser
@@ -679,7 +678,7 @@ func Decode(r io.Reader) (img image.Image, err error) {
 				if err != nil {
 					return nil, err
 				}
-				d.buf, err = ioutil.ReadAll(r)
+				d.buf, err = io.ReadAll(r)
 				r.Close()
 			case cPackBits:
 				d.buf, err = unpackBits(io.NewSectionReader(d.r, offset, n))
diff --git a/tiff/reader_test.go b/tiff/reader_test.go
index f91fd94f..3eac0ffc 100644
--- a/tiff/reader_test.go
+++ b/tiff/reader_test.go
@@ -11,7 +11,6 @@ import (
 	"errors"
 	"image"
 	"io"
-	"io/ioutil"
 	"os"
 	"strings"
 	"testing"
@@ -81,7 +80,7 @@ func TestUnpackBits(t *testing.T) {
 }
 
 func TestShortBlockData(t *testing.T) {
-	b, err := ioutil.ReadFile("../testdata/bw-uncompressed.tiff")
+	b, err := os.ReadFile("../testdata/bw-uncompressed.tiff")
 	if err != nil {
 		t.Fatal(err)
 	}
@@ -107,7 +106,7 @@ func TestShortBlockData(t *testing.T) {
 }
 
 func TestDecodeInvalidDataType(t *testing.T) {
-	b, err := ioutil.ReadFile("../testdata/bw-uncompressed.tiff")
+	b, err := os.ReadFile("../testdata/bw-uncompressed.tiff")
 	if err != nil {
 		t.Fatal(err)
 	}
@@ -232,7 +231,7 @@ func TestDecodeCCITT(t *testing.T) {
 // TestDecodeTagOrder tests that a malformed image with unsorted IFD entries is
 // correctly rejected.
 func TestDecodeTagOrder(t *testing.T) {
-	data, err := ioutil.ReadFile("../testdata/video-001.tiff")
+	data, err := os.ReadFile("../testdata/video-001.tiff")
 	if err != nil {
 		t.Fatal(err)
 	}
@@ -296,7 +295,7 @@ func replace(src []byte, find, repl string) ([]byte, error) {
 // cause a crash.
 // Issue 10711.
 func TestZeroBitsPerSample(t *testing.T) {
-	b0, err := ioutil.ReadFile(testdataDir + "bw-deflate.tiff")
+	b0, err := os.ReadFile(testdataDir + "bw-deflate.tiff")
 	if err != nil {
 		t.Fatal(err)
 	}
@@ -324,7 +323,7 @@ func TestZeroBitsPerSample(t *testing.T) {
 // the data available.
 // Issue 10712
 func TestTileTooBig(t *testing.T) {
-	b0, err := ioutil.ReadFile(testdataDir + "video-001-tile-64x64.tiff")
+	b0, err := os.ReadFile(testdataDir + "video-001-tile-64x64.tiff")
 	if err != nil {
 		t.Fatal(err)
 	}
@@ -415,7 +414,7 @@ func TestLargeIFDEntry(t *testing.T) {
 func benchmarkDecode(b *testing.B, filename string) {
 	b.Helper()
 	b.StopTimer()
-	contents, err := ioutil.ReadFile(testdataDir + filename)
+	contents, err := os.ReadFile(testdataDir + filename)
 	if err != nil {
 		b.Fatal(err)
 	}
diff --git a/tiff/writer_test.go b/tiff/writer_test.go
index 8f009e93..c8792c0a 100644
--- a/tiff/writer_test.go
+++ b/tiff/writer_test.go
@@ -7,7 +7,7 @@ package tiff
 import (
 	"bytes"
 	"image"
-	"io/ioutil"
+	"io"
 	"os"
 	"testing"
 )
@@ -94,7 +94,7 @@ func benchmarkEncode(b *testing.B, name string, pixelSize int) {
 	b.SetBytes(int64(s.X * s.Y * pixelSize))
 	b.ResetTimer()
 	for i := 0; i < b.N; i++ {
-		Encode(ioutil.Discard, img, nil)
+		Encode(io.Discard, img, nil)
 	}
 }
 
diff --git a/vector/gen.go b/vector/gen.go
index 010608af..f072f06a 100644
--- a/vector/gen.go
+++ b/vector/gen.go
@@ -9,8 +9,8 @@ package main
 
 import (
 	"bytes"
-	"io/ioutil"
 	"log"
+	"os"
 	"strings"
 	"text/template"
 )
@@ -27,7 +27,7 @@ const (
 )
 
 func main() {
-	tmpl, err := ioutil.ReadFile("gen_acc_amd64.s.tmpl")
+	tmpl, err := os.ReadFile("gen_acc_amd64.s.tmpl")
 	if err != nil {
 		log.Fatalf("ReadFile: %v", err)
 	}
@@ -64,7 +64,7 @@ func main() {
 		}
 	}
 
-	if err := ioutil.WriteFile("acc_amd64.s", out.Bytes(), 0666); err != nil {
+	if err := os.WriteFile("acc_amd64.s", out.Bytes(), 0666); err != nil {
 		log.Fatalf("WriteFile: %v", err)
 	}
 }
diff --git a/webp/decode_test.go b/webp/decode_test.go
index ad65b108..d0c2b5a0 100644
--- a/webp/decode_test.go
+++ b/webp/decode_test.go
@@ -9,7 +9,6 @@ import (
 	"fmt"
 	"image"
 	"image/png"
-	"io/ioutil"
 	"os"
 	"strings"
 	"testing"
@@ -272,7 +271,7 @@ func TestDecodePartitionTooLarge(t *testing.T) {
 }
 
 func benchmarkDecode(b *testing.B, filename string) {
-	data, err := ioutil.ReadFile("../testdata/blue-purple-pink-large." + filename + ".webp")
+	data, err := os.ReadFile("../testdata/blue-purple-pink-large." + filename + ".webp")
 	if err != nil {
 		b.Fatal(err)
 	}