diff --git a/main.go b/main.go
index 3ab2225..274a6e4 100644
--- a/main.go
+++ b/main.go
@@ -2,7 +2,6 @@ package main
 
 import (
 	"fmt"
-	"io/ioutil"
 	"os"
 
 	flag "github.com/spf13/pflag"
@@ -39,7 +38,7 @@ func main() {
 	if len(os.Args) == 1 {
 		repl.Start(os.Stdin, os.Stdout)
 	} else {
-		file, err := ioutil.ReadFile(os.Args[1])
+		file, err := os.ReadFile(os.Args[1])
 		if err == nil {
 			runProgram(string(file))
 		}
diff --git a/object/file.go b/object/file.go
index f9588dc..5c7bda7 100644
--- a/object/file.go
+++ b/object/file.go
@@ -2,8 +2,8 @@ package object
 
 import (
 	"fmt"
+	"io"
 	"io/fs"
-	"io/ioutil"
 	"os"
 	"strconv"
 	"strings"
@@ -231,7 +231,7 @@ func readFile(o Object, _ []Object, _ Environment) Object {
 		return NewError(err)
 	}
 
-	file, err := ioutil.ReadAll(f.Handle)
+	file, err := io.ReadAll(f.Handle)
 	if err != nil {
 		return NewError(err)
 	}
diff --git a/object/http_test.go b/object/http_test.go
index 1a4eb12..d8b5706 100644
--- a/object/http_test.go
+++ b/object/http_test.go
@@ -1,7 +1,7 @@
 package object_test
 
 import (
-	"io/ioutil"
+	"io"
 	"log"
 	"net/http"
 	"strings"
@@ -72,7 +72,7 @@ func TestHTTPServerMethods(t *testing.T) {
 			log.Fatal(err)
 		}
 		defer resp.Body.Close()
-		body, err := ioutil.ReadAll(resp.Body)
+		body, err := io.ReadAll(resp.Body)
 		if err != nil {
 			log.Fatal(err)
 		}