diff --git a/antlr/GruleParserV3_test.go b/antlr/GruleParserV3_test.go
index 154966b9..ca01fc3a 100755
--- a/antlr/GruleParserV3_test.go
+++ b/antlr/GruleParserV3_test.go
@@ -16,7 +16,7 @@ package antlr
 
 import (
 	"fmt"
-	"io/ioutil"
+	"os"
 	"reflect"
 	"testing"
 
@@ -105,7 +105,7 @@ type GrandChild struct {
 }
 
 func TestV3Lexer(t *testing.T) {
-	data, err := ioutil.ReadFile("./sample4.grl")
+	data, err := os.ReadFile("./sample4.grl")
 	if err != nil {
 		t.Fatal(err)
 	} else {
@@ -129,7 +129,7 @@ func TestV3Lexer(t *testing.T) {
 
 func TestV3Parser(t *testing.T) {
 	// logrus.SetLevel(logrus.TraceLevel)
-	data, err := ioutil.ReadFile("./sample4.grl")
+	data, err := os.ReadFile("./sample4.grl")
 	if err != nil {
 		t.Fatal(err)
 	} else {
diff --git a/editor/EvaluationRoute.go b/editor/EvaluationRoute.go
index 2cdb30c9..66489f3d 100644
--- a/editor/EvaluationRoute.go
+++ b/editor/EvaluationRoute.go
@@ -9,7 +9,7 @@ import (
 	"github.com/hyperjumptech/grule-rule-engine/engine"
 	"github.com/hyperjumptech/grule-rule-engine/pkg"
 	mux "github.com/hyperjumptech/hyper-mux"
-	"io/ioutil"
+	"io"
 	"net/http"
 )
 
@@ -25,7 +25,7 @@ type EvaluateRequest struct {
 
 func InitializeEvaluationRoute(router *mux.HyperMux) {
 	router.AddRoute("/evaluate", http.MethodPost, func(writer http.ResponseWriter, reader *http.Request) {
-		bodyBytes, err := ioutil.ReadAll(reader.Body)
+		bodyBytes, err := io.ReadAll(reader.Body)
 		if err != nil {
 			writer.WriteHeader(http.StatusInternalServerError)
 			_, _ = writer.Write([]byte(fmt.Sprintf("error while reading body stream. got %v", err)))
diff --git a/examples/benchmark/ExecRules_benchmark_test.go b/examples/benchmark/ExecRules_benchmark_test.go
index 092e584b..4c3ecd10 100644
--- a/examples/benchmark/ExecRules_benchmark_test.go
+++ b/examples/benchmark/ExecRules_benchmark_test.go
@@ -20,7 +20,7 @@ import (
 	"github.com/hyperjumptech/grule-rule-engine/builder"
 	"github.com/hyperjumptech/grule-rule-engine/engine"
 	"github.com/hyperjumptech/grule-rule-engine/pkg"
-	"io/ioutil"
+	"os"
 	"testing"
 )
 
@@ -66,7 +66,7 @@ func Benchmark_Grule_Execution_Engine(b *testing.B) {
 }
 
 func load100RulesIntoKnowledgebase() {
-	input, _ := ioutil.ReadFile("100_rules.grl")
+	input, _ := os.ReadFile("100_rules.grl")
 	rules := string(input)
 	fact := &RideFact{
 		Distance: 6000,
@@ -83,7 +83,7 @@ func load100RulesIntoKnowledgebase() {
 }
 
 func load1000RulesIntoKnowledgebase() {
-	input, _ := ioutil.ReadFile("1000_rules.grl")
+	input, _ := os.ReadFile("1000_rules.grl")
 	rules := string(input)
 	fact := &RideFact{
 		Distance: 6000,
diff --git a/examples/benchmark/LoadRules_benchmark_test.go b/examples/benchmark/LoadRules_benchmark_test.go
index 0d757a6d..748bb62a 100755
--- a/examples/benchmark/LoadRules_benchmark_test.go
+++ b/examples/benchmark/LoadRules_benchmark_test.go
@@ -19,7 +19,7 @@ import (
 	"github.com/hyperjumptech/grule-rule-engine/ast"
 	"github.com/hyperjumptech/grule-rule-engine/builder"
 	"github.com/hyperjumptech/grule-rule-engine/pkg"
-	"io/ioutil"
+	"os"
 	"testing"
 )
 
@@ -58,7 +58,7 @@ func Benchmark_Grule_Load_Rules(b *testing.B) {
 }
 
 func load100RulesIntoKnowledgeBase() {
-	input, _ := ioutil.ReadFile("100_rules.grl")
+	input, _ := os.ReadFile("100_rules.grl")
 	rules := string(input)
 	fact := &RideFact{
 		Distance: 6000,
@@ -74,7 +74,7 @@ func load100RulesIntoKnowledgeBase() {
 }
 
 func load1000RulesIntoKnowledgeBase() {
-	input, _ := ioutil.ReadFile("1000_rules.grl")
+	input, _ := os.ReadFile("1000_rules.grl")
 	rules := string(input)
 	fact := &RideFact{
 		Distance: 6000,
diff --git a/pkg/resource.go b/pkg/resource.go
index 9aba3704..a660f225 100644
--- a/pkg/resource.go
+++ b/pkg/resource.go
@@ -18,8 +18,8 @@ import (
 	"context"
 	"fmt"
 	"io"
-	"io/ioutil"
 	"net/http"
+	"os"
 	"path/filepath"
 	"time"
 
@@ -59,7 +59,7 @@ type ReaderResource struct {
 // Load will load the resource into byte array.
 func (res *ReaderResource) Load() ([]byte, error) {
 
-	return ioutil.ReadAll(res.Reader)
+	return io.ReadAll(res.Reader)
 }
 
 // String will state the resource source.
@@ -124,7 +124,7 @@ func (bundle *FileResourceBundle) MustLoad() []Resource {
 func (bundle *FileResourceBundle) loadPath(path string) ([]Resource, error) {
 	logger.Log.Tracef("Enter directory %s", path)
 
-	finfos, err := ioutil.ReadDir(path)
+	finfos, err := os.ReadDir(path)
 
 	if err != nil {
 
@@ -148,7 +148,7 @@ func (bundle *FileResourceBundle) loadPath(path string) ([]Resource, error) {
 				}
 				if matched {
 					logger.Log.Debugf("Loading file %s", fulPath)
-					bytes, err := ioutil.ReadFile(fulPath)
+					bytes, err := os.ReadFile(fulPath)
 					if err != nil {
 						return nil, err
 					}
@@ -182,7 +182,7 @@ func (res *FileResource) Load() ([]byte, error) {
 
 		return res.Bytes, nil
 	}
-	data, err := ioutil.ReadFile(res.Path)
+	data, err := os.ReadFile(res.Path)
 	if err != nil {
 
 		return nil, err
@@ -280,7 +280,7 @@ func (res *URLResource) Load() ([]byte, error) {
 		return nil, err
 	}
 	defer resp.Body.Close()
-	data, err := ioutil.ReadAll(resp.Body)
+	data, err := io.ReadAll(resp.Body)
 	if err != nil {
 
 		return nil, err
@@ -360,7 +360,7 @@ func (bundle *GITResourceBundle) loadPath(url, path string, fileSyst billy.Files
 
 						return nil, err
 					}
-					bytes, err := ioutil.ReadAll(f)
+					bytes, err := io.ReadAll(f)
 					if err != nil {
 
 						return nil, err