diff --git a/core/core.go b/core/core.go
index 6b68f3f..0500771 100644
--- a/core/core.go
+++ b/core/core.go
@@ -16,7 +16,6 @@ import (
 	"encoding/json"
 	"fmt"
 	"io"
-	"io/ioutil"
 	"os"
 	"path/filepath"
 	"sync"
@@ -38,7 +37,7 @@ func Init(dataPath string) error {
 		fi, err := f.Stat()
 		if err == nil && fi.Size() > 0 {
 			// File is not empty
-			jsonBytes, err := ioutil.ReadAll(f)
+			jsonBytes, err := io.ReadAll(f)
 			f.Close()
 			if err != nil {
 				return fmt.Errorf("read comitium.json error: %w", err)
@@ -73,7 +72,7 @@ func (d *FullData) WriteJSON(dataPath string) error {
 	if err != nil {
 		return err
 	}
-	err = ioutil.WriteFile(path, jsonBytes, 0666)
+	err = os.WriteFile(path, jsonBytes, 0666)
 	if err != nil {
 		return err
 	}