diff --git a/compile/compile_test.go b/compile/compile_test.go
index aee3caac..fe2c8671 100644
--- a/compile/compile_test.go
+++ b/compile/compile_test.go
@@ -10,7 +10,7 @@ package compile
 
 import (
 	"fmt"
-	"io/ioutil"
+	"io"
 	"os/exec"
 	"testing"
 
@@ -118,7 +118,7 @@ func EqCodeCode(t *testing.T, name string, a, b string) {
 		t.Errorf("%s code want %q, got %q", name, a, b)
 		return
 	}
-	stdoutData, err := ioutil.ReadAll(stdout)
+	stdoutData, err := io.ReadAll(stdout)
 	if err != nil {
 		t.Fatalf("Failed to read data: %v", err)
 	}
diff --git a/modules/runtime.go b/modules/runtime.go
index 91fc7092..0b003022 100644
--- a/modules/runtime.go
+++ b/modules/runtime.go
@@ -6,7 +6,6 @@ package modules
 
 import (
 	"bytes"
-	"io/ioutil"
 	"os"
 	"path"
 	"path/filepath"
@@ -145,7 +144,7 @@ func (ctx *context) ResolveAndCompile(pathname string, opts py.CompileOpts) (py.
 		switch ext {
 		case ".py":
 			var pySrc []byte
-			pySrc, err = ioutil.ReadFile(fpath)
+			pySrc, err = os.ReadFile(fpath)
 			if err != nil {
 				return false, py.ExceptionNewf(py.OSError, "Error reading %q: %v", fpath, err)
 			}
diff --git a/parser/testparser/testparser.go b/parser/testparser/testparser.go
index 6bf2d8e7..410ca043 100644
--- a/parser/testparser/testparser.go
+++ b/parser/testparser/testparser.go
@@ -7,7 +7,7 @@ package main
 import (
 	"flag"
 	"fmt"
-	"io/ioutil"
+	"io"
 	"log"
 	"os"
 
@@ -47,7 +47,7 @@ func main() {
 			_, err = parser.Lex(in, path, "exec")
 		} else if *compileFile {
 			var input []byte
-			input, err = ioutil.ReadAll(in)
+			input, err = io.ReadAll(in)
 			if err != nil {
 				log.Fatalf("Failed to read %q: %v", path, err)
 			}
diff --git a/py/file.go b/py/file.go
index fa270865..c60013ad 100644
--- a/py/file.go
+++ b/py/file.go
@@ -11,7 +11,6 @@ package py
 
 import (
 	"io"
-	"io/ioutil"
 	"os"
 )
 
@@ -129,7 +128,7 @@ func (o *File) Read(args Tuple, kwargs StringDict) (Object, error) {
 		return nil, ExceptionNewf(TypeError, "read() argument 1 must be int, not %s", arg.Type().Name)
 	}
 
-	b, err := ioutil.ReadAll(r)
+	b, err := io.ReadAll(r)
 	if err != nil {
 		if err == io.EOF {
 			return o.readResult(nil)
diff --git a/pytest/pytest.go b/pytest/pytest.go
index c7af7737..db556f6e 100644
--- a/pytest/pytest.go
+++ b/pytest/pytest.go
@@ -5,7 +5,7 @@
 package pytest
 
 import (
-	"io/ioutil"
+	"io"
 	"os"
 	"path"
 	"strings"
@@ -31,7 +31,7 @@ func compileProgram(t testing.TB, prog string) (*py.Module, *py.Code) {
 		}
 	}()
 
-	str, err := ioutil.ReadAll(f)
+	str, err := io.ReadAll(f)
 	if err != nil {
 		t.Fatalf("%s: ReadAll failed: %v", prog, err)
 	}
@@ -92,7 +92,7 @@ func run(t testing.TB, module *py.Module, code *py.Code) {
 
 // find the python files in the directory passed in
 func findFiles(t testing.TB, testDir string) (names []string) {
-	files, err := ioutil.ReadDir(testDir)
+	files, err := os.ReadDir(testDir)
 	if err != nil {
 		t.Fatalf("ReadDir failed: %v", err)
 	}