diff --git a/app.go b/app.go
index 14eeb6f0..4bdd7e2c 100644
--- a/app.go
+++ b/app.go
@@ -13,7 +13,6 @@ import (
 	"crypto/x509"
 	"errors"
 	"fmt"
-	"io/ioutil"
 	"net"
 	"net/http"
 	"net/http/httputil"
@@ -38,7 +37,7 @@ import (
 )
 
 // Version of current fiber package
-const Version = "2.34.0"
+const Version = "3.0.0-beta.1"
 
 // Handler defines a function to serve HTTP requests.
 type Handler = func(*Ctx) error
@@ -847,7 +846,7 @@ func (app *App) ListenMutualTLS(addr, certFile, keyFile, clientCertFile string)
 		return fmt.Errorf("tls: cannot load TLS key pair from certFile=%q and keyFile=%q: %s", certFile, keyFile, err)
 	}
 
-	clientCACert, err := ioutil.ReadFile(filepath.Clean(clientCertFile))
+	clientCACert, err := os.ReadFile(filepath.Clean(clientCertFile))
 	if err != nil {
 		return err
 	}
diff --git a/app_test.go b/app_test.go
index d942277f..364b0564 100644
--- a/app_test.go
+++ b/app_test.go
@@ -10,7 +10,6 @@ import (
 	"errors"
 	"fmt"
 	"io"
-	"io/ioutil"
 	"log"
 	"mime/multipart"
 	"net"
@@ -47,7 +46,7 @@ func testErrorResponse(t *testing.T, err error, resp *http.Response, expectedBod
 	utils.AssertEqual(t, nil, err, "app.Test(req)")
 	utils.AssertEqual(t, 500, resp.StatusCode, "Status code")
 
-	body, err := ioutil.ReadAll(resp.Body)
+	body, err := io.ReadAll(resp.Body)
 	utils.AssertEqual(t, nil, err)
 	utils.AssertEqual(t, expectedBodyError, string(body), "Response body")
 }
@@ -165,7 +164,7 @@ func Test_App_Errors(t *testing.T) {
 	utils.AssertEqual(t, nil, err, "app.Test(req)")
 	utils.AssertEqual(t, 500, resp.StatusCode, "Status code")
 
-	body, err := ioutil.ReadAll(resp.Body)
+	body, err := io.ReadAll(resp.Body)
 	utils.AssertEqual(t, nil, err)
 	utils.AssertEqual(t, "hi, i'm an error", string(body))
 
@@ -190,7 +189,7 @@ func Test_App_ErrorHandler_Custom(t *testing.T) {
 	utils.AssertEqual(t, nil, err, "app.Test(req)")
 	utils.AssertEqual(t, 200, resp.StatusCode, "Status code")
 
-	body, err := ioutil.ReadAll(resp.Body)
+	body, err := io.ReadAll(resp.Body)
 	utils.AssertEqual(t, nil, err)
 	utils.AssertEqual(t, "hi, i'm an custom error", string(body))
 }
@@ -219,7 +218,7 @@ func Test_App_ErrorHandler_HandlerStack(t *testing.T) {
 	utils.AssertEqual(t, nil, err, "app.Test(req)")
 	utils.AssertEqual(t, 500, resp.StatusCode, "Status code")
 
-	body, err := ioutil.ReadAll(resp.Body)
+	body, err := io.ReadAll(resp.Body)
 	utils.AssertEqual(t, nil, err)
 	utils.AssertEqual(t, "1: USE error", string(body))
 }
@@ -244,7 +243,7 @@ func Test_App_ErrorHandler_RouteStack(t *testing.T) {
 	utils.AssertEqual(t, nil, err, "app.Test(req)")
 	utils.AssertEqual(t, 500, resp.StatusCode, "Status code")
 
-	body, err := ioutil.ReadAll(resp.Body)
+	body, err := io.ReadAll(resp.Body)
 	utils.AssertEqual(t, nil, err)
 	utils.AssertEqual(t, "1: USE error", string(body))
 }
@@ -385,7 +384,7 @@ func Test_App_Use_UnescapedPath(t *testing.T) {
 	utils.AssertEqual(t, nil, err, "app.Test(req)")
 	utils.AssertEqual(t, StatusOK, resp.StatusCode, "Status code")
 
-	body, err := ioutil.ReadAll(resp.Body)
+	body, err := io.ReadAll(resp.Body)
 	utils.AssertEqual(t, nil, err, "app.Test(req)")
 	// check the param result
 	utils.AssertEqual(t, "اختبار", app.getString(body))
@@ -420,7 +419,7 @@ func Test_App_Use_CaseSensitive(t *testing.T) {
 	utils.AssertEqual(t, nil, err, "app.Test(req)")
 	utils.AssertEqual(t, StatusOK, resp.StatusCode, "Status code")
 
-	body, err := ioutil.ReadAll(resp.Body)
+	body, err := io.ReadAll(resp.Body)
 	utils.AssertEqual(t, nil, err, "app.Test(req)")
 	// check the detected path result
 	utils.AssertEqual(t, "/AbC", app.getString(body))
@@ -522,7 +521,7 @@ func Test_App_Order(t *testing.T) {
 	utils.AssertEqual(t, nil, err, "app.Test(req)")
 	utils.AssertEqual(t, 200, resp.StatusCode, "Status code")
 
-	body, err := ioutil.ReadAll(resp.Body)
+	body, err := io.ReadAll(resp.Body)
 	utils.AssertEqual(t, nil, err)
 	utils.AssertEqual(t, "123", string(body))
 }
@@ -644,7 +643,7 @@ func Test_App_Static_Index_Default(t *testing.T) {
 	utils.AssertEqual(t, false, resp.Header.Get(HeaderContentLength) == "")
 	utils.AssertEqual(t, MIMETextHTMLCharsetUTF8, resp.Header.Get(HeaderContentType))
 
-	body, err := ioutil.ReadAll(resp.Body)
+	body, err := io.ReadAll(resp.Body)
 	utils.AssertEqual(t, nil, err)
 	utils.AssertEqual(t, true, strings.Contains(string(body), "Hello, World!"))
 
@@ -654,7 +653,7 @@ func Test_App_Static_Index_Default(t *testing.T) {
 	utils.AssertEqual(t, false, resp.Header.Get(HeaderContentLength) == "")
 	utils.AssertEqual(t, MIMETextPlainCharsetUTF8, resp.Header.Get(HeaderContentType))
 
-	body, err = ioutil.ReadAll(resp.Body)
+	body, err = io.ReadAll(resp.Body)
 	utils.AssertEqual(t, nil, err)
 	utils.AssertEqual(t, "Cannot GET /not-found", string(body))
 }
@@ -671,7 +670,7 @@ func Test_App_Static_Direct(t *testing.T) {
 	utils.AssertEqual(t, false, resp.Header.Get(HeaderContentLength) == "")
 	utils.AssertEqual(t, MIMETextHTMLCharsetUTF8, resp.Header.Get(HeaderContentType))
 
-	body, err := ioutil.ReadAll(resp.Body)
+	body, err := io.ReadAll(resp.Body)
 	utils.AssertEqual(t, nil, err)
 	utils.AssertEqual(t, true, strings.Contains(string(body), "Hello, World!"))
 
@@ -682,7 +681,7 @@ func Test_App_Static_Direct(t *testing.T) {
 	utils.AssertEqual(t, MIMEApplicationJSON, resp.Header.Get("Content-Type"))
 	utils.AssertEqual(t, "", resp.Header.Get(HeaderCacheControl), "CacheControl Control")
 
-	body, err = ioutil.ReadAll(resp.Body)
+	body, err = io.ReadAll(resp.Body)
 	utils.AssertEqual(t, nil, err)
 	utils.AssertEqual(t, true, strings.Contains(string(body), "testRoutes"))
 }
@@ -759,7 +758,7 @@ func Test_App_Static_Wildcard(t *testing.T) {
 	utils.AssertEqual(t, false, resp.Header.Get(HeaderContentLength) == "")
 	utils.AssertEqual(t, MIMETextHTMLCharsetUTF8, resp.Header.Get(HeaderContentType))
 
-	body, err := ioutil.ReadAll(resp.Body)
+	body, err := io.ReadAll(resp.Body)
 	utils.AssertEqual(t, nil, err)
 	utils.AssertEqual(t, true, strings.Contains(string(body), "Test file"))
 }
@@ -784,7 +783,7 @@ func Test_App_Static_Prefix_Wildcard(t *testing.T) {
 	utils.AssertEqual(t, false, resp.Header.Get(HeaderContentLength) == "")
 	utils.AssertEqual(t, MIMETextHTMLCharsetUTF8, resp.Header.Get(HeaderContentType))
 
-	body, err := ioutil.ReadAll(resp.Body)
+	body, err := io.ReadAll(resp.Body)
 	utils.AssertEqual(t, nil, err)
 	utils.AssertEqual(t, true, strings.Contains(string(body), "Test file"))
 }
@@ -887,7 +886,7 @@ func Test_App_Static_Next(t *testing.T) {
 		utils.AssertEqual(t, false, resp.Header.Get(HeaderContentLength) == "")
 		utils.AssertEqual(t, MIMETextPlainCharsetUTF8, resp.Header.Get(HeaderContentType))
 
-		body, err := ioutil.ReadAll(resp.Body)
+		body, err := io.ReadAll(resp.Body)
 		utils.AssertEqual(t, nil, err)
 		utils.AssertEqual(t, true, strings.Contains(string(body), "You've skipped app.Static"))
 	})
@@ -901,7 +900,7 @@ func Test_App_Static_Next(t *testing.T) {
 		utils.AssertEqual(t, false, resp.Header.Get(HeaderContentLength) == "")
 		utils.AssertEqual(t, MIMETextHTMLCharsetUTF8, resp.Header.Get(HeaderContentType))
 
-		body, err := ioutil.ReadAll(resp.Body)
+		body, err := io.ReadAll(resp.Body)
 		utils.AssertEqual(t, nil, err)
 		utils.AssertEqual(t, true, strings.Contains(string(body), "Hello, World!"))
 	})
@@ -932,7 +931,7 @@ func Test_App_Mixed_Routes_WithSameLen(t *testing.T) {
 	utils.AssertEqual(t, "TestValue", resp.Header.Get("TestHeader"))
 	utils.AssertEqual(t, "text/html", resp.Header.Get(HeaderContentType))
 
-	body, err := ioutil.ReadAll(resp.Body)
+	body, err := io.ReadAll(resp.Body)
 	utils.AssertEqual(t, nil, err)
 	utils.AssertEqual(t, "FOO_BAR", string(body))
 
@@ -945,7 +944,7 @@ func Test_App_Mixed_Routes_WithSameLen(t *testing.T) {
 	utils.AssertEqual(t, "TestValue", resp.Header.Get("TestHeader"))
 	utils.AssertEqual(t, "text/html; charset=utf-8", resp.Header.Get(HeaderContentType))
 
-	body, err = ioutil.ReadAll(resp.Body)
+	body, err = io.ReadAll(resp.Body)
 	utils.AssertEqual(t, nil, err)
 	utils.AssertEqual(t, true, strings.Contains(string(body), "Hello, World!"), "Response: "+string(body))
 	utils.AssertEqual(t, true, strings.HasPrefix(string(body), "<!DOCTYPE html>"), "Response: "+string(body))
@@ -1545,8 +1544,8 @@ func Test_App_ReadBodyStream(t *testing.T) {
 	testString := "this is a test"
 	resp, err := app.Test(httptest.NewRequest("POST", "/", bytes.NewBufferString(testString)))
 	utils.AssertEqual(t, nil, err, "app.Test(req)")
-	body, err := ioutil.ReadAll(resp.Body)
-	utils.AssertEqual(t, nil, err, "ioutil.ReadAll(resp.Body)")
+	body, err := io.ReadAll(resp.Body)
+	utils.AssertEqual(t, nil, err, "io.ReadAll(resp.Body)")
 	utils.AssertEqual(t, fmt.Sprintf("true %s", testString), string(body))
 }
 
@@ -1591,8 +1590,8 @@ func Test_App_DisablePreParseMultipartForm(t *testing.T) {
 	req.Header.Set("Content-Type", w.FormDataContentType())
 	resp, err := app.Test(req)
 	utils.AssertEqual(t, nil, err, "app.Test(req)")
-	body, err := ioutil.ReadAll(resp.Body)
-	utils.AssertEqual(t, nil, err, "ioutil.ReadAll(resp.Body)")
+	body, err := io.ReadAll(resp.Body)
+	utils.AssertEqual(t, nil, err, "io.ReadAll(resp.Body)")
 
 	utils.AssertEqual(t, testString, string(body))
 }
@@ -1674,7 +1673,7 @@ func Test_App_UseMountedErrorHandlerForBestPrefixMatch(t *testing.T) {
 	utils.AssertEqual(t, nil, err, "/api/sub req")
 	utils.AssertEqual(t, 200, resp.StatusCode, "Status code")
 
-	b, err := ioutil.ReadAll(resp.Body)
+	b, err := io.ReadAll(resp.Body)
 	utils.AssertEqual(t, nil, err, "iotuil.ReadAll()")
 	utils.AssertEqual(t, "hi, i'm a custom sub fiber error", string(b), "Response body")
 
@@ -1682,7 +1681,7 @@ func Test_App_UseMountedErrorHandlerForBestPrefixMatch(t *testing.T) {
 	utils.AssertEqual(t, nil, err, "/api/sub/third req")
 	utils.AssertEqual(t, 200, resp.StatusCode, "Status code")
 
-	b, err = ioutil.ReadAll(resp2.Body)
+	b, err = io.ReadAll(resp2.Body)
 	utils.AssertEqual(t, nil, err, "iotuil.ReadAll()")
 	utils.AssertEqual(t, "hi, i'm a custom sub sub fiber error", string(b), "Third fiber Response body")
 }
diff --git a/client.go b/client.go
index 94da20f2..9a8a7475 100644
--- a/client.go
+++ b/client.go
@@ -7,7 +7,6 @@ import (
 	"encoding/xml"
 	"fmt"
 	"io"
-	"io/ioutil"
 	"mime/multipart"
 	"net"
 	"os"
@@ -542,7 +541,7 @@ func (a *Agent) FileData(formFiles ...*FormFile) *Agent {
 
 // SendFile reads file and appends it to multipart form request.
 func (a *Agent) SendFile(filename string, fieldname ...string) *Agent {
-	content, err := ioutil.ReadFile(filepath.Clean(filename))
+	content, err := os.ReadFile(filepath.Clean(filename))
 	if err != nil {
 		a.errs = append(a.errs, err)
 		return a
diff --git a/client_test.go b/client_test.go
index 02ffacdb..f51c5326 100644
--- a/client_test.go
+++ b/client_test.go
@@ -7,9 +7,9 @@ import (
 	"errors"
 	"fmt"
 	"io"
-	"io/ioutil"
 	"mime/multipart"
 	"net"
+	"os"
 	"path/filepath"
 	"regexp"
 	"strings"
@@ -812,7 +812,7 @@ func checkFormFile(t *testing.T, fh *multipart.FileHeader, filename string) {
 	basename := filepath.Base(filename)
 	utils.AssertEqual(t, fh.Filename, basename)
 
-	b1, err := ioutil.ReadFile(filename)
+	b1, err := os.ReadFile(filename)
 	utils.AssertEqual(t, nil, err)
 
 	b2 := make([]byte, fh.Size)
diff --git a/ctx.go b/ctx.go
index 3930e6d6..6f1f1a77 100644
--- a/ctx.go
+++ b/ctx.go
@@ -12,7 +12,6 @@ import (
 	"errors"
 	"fmt"
 	"io"
-	"io/ioutil"
 	"mime/multipart"
 	"net"
 	"net/http"
@@ -1316,7 +1315,7 @@ func (c *Ctx) SaveFileToStorage(fileheader *multipart.FileHeader, path string, s
 		return err
 	}
 
-	content, err := ioutil.ReadAll(file)
+	content, err := io.ReadAll(file)
 	if err != nil {
 		return err
 	}
diff --git a/ctx_test.go b/ctx_test.go
index a2408b8f..5c3b3ffa 100644
--- a/ctx_test.go
+++ b/ctx_test.go
@@ -15,7 +15,6 @@ import (
 	"errors"
 	"fmt"
 	"io"
-	"io/ioutil"
 	"mime/multipart"
 	"net/http/httptest"
 	"net/url"
@@ -644,7 +643,7 @@ func Test_Ctx_UserContext_Multiple_Requests(t *testing.T) {
 			utils.AssertEqual(t, nil, err, "Unexpected error from response")
 			utils.AssertEqual(t, StatusOK, resp.StatusCode, "context.Context returned from c.UserContext() is reused")
 
-			b, err := ioutil.ReadAll(resp.Body)
+			b, err := io.ReadAll(resp.Body)
 			utils.AssertEqual(t, nil, err, "Unexpected error from reading response body")
 			utils.AssertEqual(t, fmt.Sprintf("resp_%d_returned", i), string(b), "response text incorrect")
 		})
@@ -1067,7 +1066,7 @@ func Test_Ctx_PortInHandler(t *testing.T) {
 	utils.AssertEqual(t, nil, err, "app.Test(req)")
 	utils.AssertEqual(t, StatusOK, resp.StatusCode, "Status code")
 
-	body, err := ioutil.ReadAll(resp.Body)
+	body, err := io.ReadAll(resp.Body)
 	utils.AssertEqual(t, nil, err)
 	utils.AssertEqual(t, "0", string(body))
 }
@@ -1700,14 +1699,14 @@ func Test_Ctx_SaveFile(t *testing.T) {
 		fh, err := c.FormFile("file")
 		utils.AssertEqual(t, nil, err)
 
-		tempFile, err := ioutil.TempFile(os.TempDir(), "test-")
+		tempFile, err := os.CreateTemp(os.TempDir(), "test-")
 		utils.AssertEqual(t, nil, err)
 
 		defer os.Remove(tempFile.Name())
 		err = c.SaveFile(fh, tempFile.Name())
 		utils.AssertEqual(t, nil, err)
 
-		bs, err := ioutil.ReadFile(tempFile.Name())
+		bs, err := os.ReadFile(tempFile.Name())
 		utils.AssertEqual(t, nil, err)
 		utils.AssertEqual(t, "hello world", string(bs))
 		return nil
@@ -1851,7 +1850,7 @@ func Test_Ctx_Download(t *testing.T) {
 	utils.AssertEqual(t, nil, err)
 	defer f.Close()
 
-	expect, err := ioutil.ReadAll(f)
+	expect, err := io.ReadAll(f)
 	utils.AssertEqual(t, nil, err)
 	utils.AssertEqual(t, expect, c.Response().Body())
 	utils.AssertEqual(t, `attachment; filename="Awesome+File%21"`, string(c.Response().Header.Peek(HeaderContentDisposition)))
@@ -1869,7 +1868,7 @@ func Test_Ctx_SendFile(t *testing.T) {
 	f, err := os.Open("./ctx.go")
 	utils.AssertEqual(t, nil, err)
 	defer f.Close()
-	expectFileContent, err := ioutil.ReadAll(f)
+	expectFileContent, err := io.ReadAll(f)
 	utils.AssertEqual(t, nil, err)
 	// fetch file info for the not modified test case
 	fI, err := os.Stat("./ctx.go")
@@ -2335,7 +2334,7 @@ func Test_Ctx_Render_Mount(t *testing.T) {
 	utils.AssertEqual(t, StatusOK, resp.StatusCode, "Status code")
 	utils.AssertEqual(t, nil, err, "app.Test(req)")
 
-	body, err := ioutil.ReadAll(resp.Body)
+	body, err := io.ReadAll(resp.Body)
 	utils.AssertEqual(t, nil, err)
 	utils.AssertEqual(t, "<h1>Hello a!</h1>", string(body))
 }
@@ -2361,7 +2360,7 @@ func Test_Ctx_Render_MountGroup(t *testing.T) {
 	utils.AssertEqual(t, nil, err, "app.Test(req)")
 	utils.AssertEqual(t, 200, resp.StatusCode, "Status code")
 
-	body, err := ioutil.ReadAll(resp.Body)
+	body, err := io.ReadAll(resp.Body)
 	utils.AssertEqual(t, nil, err)
 	utils.AssertEqual(t, "<h1>Hello doe!</h1>", string(body))
 }
@@ -2810,7 +2809,7 @@ func Test_Ctx_Render_Engine_Error(t *testing.T) {
 func Test_Ctx_Render_Go_Template(t *testing.T) {
 	t.Parallel()
 
-	file, err := ioutil.TempFile(os.TempDir(), "fiber")
+	file, err := os.CreateTemp(os.TempDir(), "fiber")
 	utils.AssertEqual(t, nil, err)
 	defer os.Remove(file.Name())
 
diff --git a/middleware/basicauth/basicauth_test.go b/middleware/basicauth/basicauth_test.go
index fc57c204..82dd0821 100644
--- a/middleware/basicauth/basicauth_test.go
+++ b/middleware/basicauth/basicauth_test.go
@@ -2,7 +2,7 @@ package basicauth
 
 import (
 	"fmt"
-	"io/ioutil"
+	"io"
 	"net/http/httptest"
 	"testing"
 
@@ -82,7 +82,7 @@ func Test_Middleware_BasicAuth(t *testing.T) {
 		resp, err := app.Test(req)
 		utils.AssertEqual(t, nil, err)
 
-		body, err := ioutil.ReadAll(resp.Body)
+		body, err := io.ReadAll(resp.Body)
 
 		utils.AssertEqual(t, nil, err)
 		utils.AssertEqual(t, tt.statusCode, resp.StatusCode)
diff --git a/middleware/cache/cache_test.go b/middleware/cache/cache_test.go
index 7d2d6033..706c90d0 100644
--- a/middleware/cache/cache_test.go
+++ b/middleware/cache/cache_test.go
@@ -5,10 +5,11 @@ package cache
 import (
 	"bytes"
 	"fmt"
-	"io/ioutil"
+	"io"
 	"math"
 	"net/http"
 	"net/http/httptest"
+	"os"
 	"strconv"
 	"testing"
 	"time"
@@ -53,7 +54,7 @@ func Test_Cache_Expired(t *testing.T) {
 
 	resp, err := app.Test(httptest.NewRequest("GET", "/", nil))
 	utils.AssertEqual(t, nil, err)
-	body, err := ioutil.ReadAll(resp.Body)
+	body, err := io.ReadAll(resp.Body)
 	utils.AssertEqual(t, nil, err)
 
 	// Sleep until the cache is expired
@@ -61,7 +62,7 @@ func Test_Cache_Expired(t *testing.T) {
 
 	respCached, err := app.Test(httptest.NewRequest("GET", "/", nil))
 	utils.AssertEqual(t, nil, err)
-	bodyCached, err := ioutil.ReadAll(respCached.Body)
+	bodyCached, err := io.ReadAll(respCached.Body)
 	utils.AssertEqual(t, nil, err)
 
 	if bytes.Equal(body, bodyCached) {
@@ -71,7 +72,7 @@ func Test_Cache_Expired(t *testing.T) {
 	// Next response should be also cached
 	respCachedNextRound, err := app.Test(httptest.NewRequest("GET", "/", nil))
 	utils.AssertEqual(t, nil, err)
-	bodyCachedNextRound, err := ioutil.ReadAll(respCachedNextRound.Body)
+	bodyCachedNextRound, err := io.ReadAll(respCachedNextRound.Body)
 	utils.AssertEqual(t, nil, err)
 
 	if !bytes.Equal(bodyCachedNextRound, bodyCached) {
@@ -98,9 +99,9 @@ func Test_Cache(t *testing.T) {
 	cachedResp, err := app.Test(cachedReq)
 	utils.AssertEqual(t, nil, err)
 
-	body, err := ioutil.ReadAll(resp.Body)
+	body, err := io.ReadAll(resp.Body)
 	utils.AssertEqual(t, nil, err)
-	cachedBody, err := ioutil.ReadAll(cachedResp.Body)
+	cachedBody, err := io.ReadAll(cachedResp.Body)
 	utils.AssertEqual(t, nil, err)
 
 	utils.AssertEqual(t, cachedBody, body)
@@ -128,7 +129,7 @@ func Test_Cache_WithSeveralRequests(t *testing.T) {
 
 				defer rsp.Body.Close()
 
-				idFromServ, err := ioutil.ReadAll(rsp.Body)
+				idFromServ, err := io.ReadAll(rsp.Body)
 				utils.AssertEqual(t, nil, err)
 
 				a, err := strconv.Atoi(string(idFromServ))
@@ -161,9 +162,9 @@ func Test_Cache_Invalid_Expiration(t *testing.T) {
 	cachedResp, err := app.Test(cachedReq)
 	utils.AssertEqual(t, nil, err)
 
-	body, err := ioutil.ReadAll(resp.Body)
+	body, err := io.ReadAll(resp.Body)
 	utils.AssertEqual(t, nil, err)
-	cachedBody, err := ioutil.ReadAll(cachedResp.Body)
+	cachedBody, err := io.ReadAll(cachedResp.Body)
 	utils.AssertEqual(t, nil, err)
 
 	utils.AssertEqual(t, cachedBody, body)
@@ -186,25 +187,25 @@ func Test_Cache_Invalid_Method(t *testing.T) {
 
 	resp, err := app.Test(httptest.NewRequest("POST", "/?cache=123", nil))
 	utils.AssertEqual(t, nil, err)
-	body, err := ioutil.ReadAll(resp.Body)
+	body, err := io.ReadAll(resp.Body)
 	utils.AssertEqual(t, nil, err)
 	utils.AssertEqual(t, "123", string(body))
 
 	resp, err = app.Test(httptest.NewRequest("POST", "/?cache=12345", nil))
 	utils.AssertEqual(t, nil, err)
-	body, err = ioutil.ReadAll(resp.Body)
+	body, err = io.ReadAll(resp.Body)
 	utils.AssertEqual(t, nil, err)
 	utils.AssertEqual(t, "12345", string(body))
 
 	resp, err = app.Test(httptest.NewRequest("GET", "/get?cache=123", nil))
 	utils.AssertEqual(t, nil, err)
-	body, err = ioutil.ReadAll(resp.Body)
+	body, err = io.ReadAll(resp.Body)
 	utils.AssertEqual(t, nil, err)
 	utils.AssertEqual(t, "123", string(body))
 
 	resp, err = app.Test(httptest.NewRequest("GET", "/get?cache=12345", nil))
 	utils.AssertEqual(t, nil, err)
-	body, err = ioutil.ReadAll(resp.Body)
+	body, err = io.ReadAll(resp.Body)
 	utils.AssertEqual(t, nil, err)
 	utils.AssertEqual(t, "123", string(body))
 }
@@ -222,14 +223,14 @@ func Test_Cache_NothingToCache(t *testing.T) {
 
 	resp, err := app.Test(httptest.NewRequest("GET", "/", nil))
 	utils.AssertEqual(t, nil, err)
-	body, err := ioutil.ReadAll(resp.Body)
+	body, err := io.ReadAll(resp.Body)
 	utils.AssertEqual(t, nil, err)
 
 	time.Sleep(500 * time.Millisecond)
 
 	respCached, err := app.Test(httptest.NewRequest("GET", "/", nil))
 	utils.AssertEqual(t, nil, err)
-	bodyCached, err := ioutil.ReadAll(respCached.Body)
+	bodyCached, err := io.ReadAll(respCached.Body)
 	utils.AssertEqual(t, nil, err)
 
 	if bytes.Equal(body, bodyCached) {
@@ -259,12 +260,12 @@ func Test_Cache_CustomNext(t *testing.T) {
 
 	resp, err := app.Test(httptest.NewRequest("GET", "/", nil))
 	utils.AssertEqual(t, nil, err)
-	body, err := ioutil.ReadAll(resp.Body)
+	body, err := io.ReadAll(resp.Body)
 	utils.AssertEqual(t, nil, err)
 
 	respCached, err := app.Test(httptest.NewRequest("GET", "/", nil))
 	utils.AssertEqual(t, nil, err)
-	bodyCached, err := ioutil.ReadAll(respCached.Body)
+	bodyCached, err := io.ReadAll(respCached.Body)
 	utils.AssertEqual(t, nil, err)
 	utils.AssertEqual(t, true, bytes.Equal(body, bodyCached))
 	utils.AssertEqual(t, true, respCached.Header.Get(fiber.HeaderCacheControl) != "")
@@ -326,9 +327,9 @@ func Test_CustomExpiration(t *testing.T) {
 	cachedResp, err := app.Test(httptest.NewRequest("GET", "/", nil))
 	utils.AssertEqual(t, nil, err)
 
-	body, err := ioutil.ReadAll(resp.Body)
+	body, err := io.ReadAll(resp.Body)
 	utils.AssertEqual(t, nil, err)
-	cachedBody, err := ioutil.ReadAll(cachedResp.Body)
+	cachedBody, err := io.ReadAll(cachedResp.Body)
 	utils.AssertEqual(t, nil, err)
 
 	if bytes.Equal(body, cachedBody) {
@@ -338,7 +339,7 @@ func Test_CustomExpiration(t *testing.T) {
 	// Next response should be cached
 	cachedRespNextRound, err := app.Test(httptest.NewRequest("GET", "/", nil))
 	utils.AssertEqual(t, nil, err)
-	cachedBodyNextRound, err := ioutil.ReadAll(cachedRespNextRound.Body)
+	cachedBodyNextRound, err := io.ReadAll(cachedRespNextRound.Body)
 	utils.AssertEqual(t, nil, err)
 
 	if !bytes.Equal(cachedBodyNextRound, cachedBody) {
@@ -430,9 +431,9 @@ func Test_Cache_WithHead(t *testing.T) {
 	cachedResp, err := app.Test(cachedReq)
 	utils.AssertEqual(t, cacheHit, cachedResp.Header.Get("X-Cache"))
 
-	body, err := ioutil.ReadAll(resp.Body)
+	body, err := io.ReadAll(resp.Body)
 	utils.AssertEqual(t, nil, err)
-	cachedBody, err := ioutil.ReadAll(cachedResp.Body)
+	cachedBody, err := io.ReadAll(cachedResp.Body)
 	utils.AssertEqual(t, nil, err)
 
 	utils.AssertEqual(t, cachedBody, body)
@@ -449,28 +450,28 @@ func Test_Cache_WithHeadThenGet(t *testing.T) {
 
 	headResp, err := app.Test(httptest.NewRequest("HEAD", "/?cache=123", nil))
 	utils.AssertEqual(t, nil, err)
-	headBody, err := ioutil.ReadAll(headResp.Body)
+	headBody, err := io.ReadAll(headResp.Body)
 	utils.AssertEqual(t, nil, err)
 	utils.AssertEqual(t, "", string(headBody))
 	utils.AssertEqual(t, cacheMiss, headResp.Header.Get("X-Cache"))
 
 	headResp, err = app.Test(httptest.NewRequest("HEAD", "/?cache=123", nil))
 	utils.AssertEqual(t, nil, err)
-	headBody, err = ioutil.ReadAll(headResp.Body)
+	headBody, err = io.ReadAll(headResp.Body)
 	utils.AssertEqual(t, nil, err)
 	utils.AssertEqual(t, "", string(headBody))
 	utils.AssertEqual(t, cacheHit, headResp.Header.Get("X-Cache"))
 
 	getResp, err := app.Test(httptest.NewRequest("GET", "/?cache=123", nil))
 	utils.AssertEqual(t, nil, err)
-	getBody, err := ioutil.ReadAll(getResp.Body)
+	getBody, err := io.ReadAll(getResp.Body)
 	utils.AssertEqual(t, nil, err)
 	utils.AssertEqual(t, "123", string(getBody))
 	utils.AssertEqual(t, cacheMiss, getResp.Header.Get("X-Cache"))
 
 	getResp, err = app.Test(httptest.NewRequest("GET", "/?cache=123", nil))
 	utils.AssertEqual(t, nil, err)
-	getBody, err = ioutil.ReadAll(getResp.Body)
+	getBody, err = io.ReadAll(getResp.Body)
 	utils.AssertEqual(t, nil, err)
 	utils.AssertEqual(t, "123", string(getBody))
 	utils.AssertEqual(t, cacheHit, getResp.Header.Get("X-Cache"))
@@ -583,7 +584,7 @@ func Benchmark_Cache(b *testing.B) {
 	app.Use(New())
 
 	app.Get("/demo", func(c *fiber.Ctx) error {
-		data, _ := ioutil.ReadFile("../../.github/README.md")
+		data, _ := os.ReadFile("../../.github/README.md")
 		return c.Status(fiber.StatusTeapot).Send(data)
 	})
 
@@ -613,7 +614,7 @@ func Benchmark_Cache_Storage(b *testing.B) {
 	}))
 
 	app.Get("/demo", func(c *fiber.Ctx) error {
-		data, _ := ioutil.ReadFile("../../.github/README.md")
+		data, _ := os.ReadFile("../../.github/README.md")
 		return c.Status(fiber.StatusTeapot).Send(data)
 	})
 
diff --git a/middleware/compress/compress_test.go b/middleware/compress/compress_test.go
index 1aeaca2c..13ea820d 100644
--- a/middleware/compress/compress_test.go
+++ b/middleware/compress/compress_test.go
@@ -3,8 +3,9 @@ package compress
 import (
 	"errors"
 	"fmt"
-	"io/ioutil"
+	"io"
 	"net/http/httptest"
+	"os"
 	"testing"
 
 	"github.com/gofiber/fiber/v3"
@@ -14,7 +15,7 @@ import (
 var filedata []byte
 
 func init() {
-	dat, err := ioutil.ReadFile("../../.github/README.md")
+	dat, err := os.ReadFile("../../.github/README.md")
 	if err != nil {
 		panic(err)
 	}
@@ -41,7 +42,7 @@ func Test_Compress_Gzip(t *testing.T) {
 	utils.AssertEqual(t, "gzip", resp.Header.Get(fiber.HeaderContentEncoding))
 
 	// Validate that the file size has shrunk
-	body, err := ioutil.ReadAll(resp.Body)
+	body, err := io.ReadAll(resp.Body)
 	utils.AssertEqual(t, nil, err)
 	utils.AssertEqual(t, true, len(body) < len(filedata))
 }
@@ -69,7 +70,7 @@ func Test_Compress_Different_Level(t *testing.T) {
 			utils.AssertEqual(t, "gzip", resp.Header.Get(fiber.HeaderContentEncoding))
 
 			// Validate that the file size has shrunk
-			body, err := ioutil.ReadAll(resp.Body)
+			body, err := io.ReadAll(resp.Body)
 			utils.AssertEqual(t, nil, err)
 			utils.AssertEqual(t, true, len(body) < len(filedata))
 		})
@@ -94,7 +95,7 @@ func Test_Compress_Deflate(t *testing.T) {
 	utils.AssertEqual(t, "deflate", resp.Header.Get(fiber.HeaderContentEncoding))
 
 	// Validate that the file size has shrunk
-	body, err := ioutil.ReadAll(resp.Body)
+	body, err := io.ReadAll(resp.Body)
 	utils.AssertEqual(t, nil, err)
 	utils.AssertEqual(t, true, len(body) < len(filedata))
 }
@@ -117,7 +118,7 @@ func Test_Compress_Brotli(t *testing.T) {
 	utils.AssertEqual(t, "br", resp.Header.Get(fiber.HeaderContentEncoding))
 
 	// Validate that the file size has shrunk
-	body, err := ioutil.ReadAll(resp.Body)
+	body, err := io.ReadAll(resp.Body)
 	utils.AssertEqual(t, nil, err)
 	utils.AssertEqual(t, true, len(body) < len(filedata))
 }
@@ -140,7 +141,7 @@ func Test_Compress_Disabled(t *testing.T) {
 	utils.AssertEqual(t, "", resp.Header.Get(fiber.HeaderContentEncoding))
 
 	// Validate the file size is not shrunk
-	body, err := ioutil.ReadAll(resp.Body)
+	body, err := io.ReadAll(resp.Body)
 	utils.AssertEqual(t, nil, err)
 	utils.AssertEqual(t, true, len(body) == len(filedata))
 }
@@ -162,7 +163,7 @@ func Test_Compress_Next_Error(t *testing.T) {
 	utils.AssertEqual(t, 500, resp.StatusCode, "Status code")
 	utils.AssertEqual(t, "", resp.Header.Get(fiber.HeaderContentEncoding))
 
-	body, err := ioutil.ReadAll(resp.Body)
+	body, err := io.ReadAll(resp.Body)
 	utils.AssertEqual(t, nil, err)
 	utils.AssertEqual(t, "next error", string(body))
 }
diff --git a/middleware/etag/etag_test.go b/middleware/etag/etag_test.go
index b4568cb4..d309d2b8 100644
--- a/middleware/etag/etag_test.go
+++ b/middleware/etag/etag_test.go
@@ -2,7 +2,7 @@ package etag
 
 import (
 	"bytes"
-	"io/ioutil"
+	"io"
 	"net/http/httptest"
 	"testing"
 
@@ -114,7 +114,7 @@ func testETagNewEtag(t *testing.T, headerIfNoneMatch, matched bool) {
 
 	if matched {
 		utils.AssertEqual(t, fiber.StatusNotModified, resp.StatusCode)
-		b, err := ioutil.ReadAll(resp.Body)
+		b, err := io.ReadAll(resp.Body)
 		utils.AssertEqual(t, nil, err)
 		utils.AssertEqual(t, 0, len(b))
 	}
@@ -164,7 +164,7 @@ func testETagWeakEtag(t *testing.T, headerIfNoneMatch, matched bool) {
 
 	if matched {
 		utils.AssertEqual(t, fiber.StatusNotModified, resp.StatusCode)
-		b, err := ioutil.ReadAll(resp.Body)
+		b, err := io.ReadAll(resp.Body)
 		utils.AssertEqual(t, nil, err)
 		utils.AssertEqual(t, 0, len(b))
 	}
@@ -218,7 +218,7 @@ func testETagCustomEtag(t *testing.T, headerIfNoneMatch, matched bool) {
 
 	if matched {
 		utils.AssertEqual(t, fiber.StatusNotModified, resp.StatusCode)
-		b, err := ioutil.ReadAll(resp.Body)
+		b, err := io.ReadAll(resp.Body)
 		utils.AssertEqual(t, nil, err)
 		utils.AssertEqual(t, 0, len(b))
 	}
diff --git a/middleware/expvar/expvar_test.go b/middleware/expvar/expvar_test.go
index 3e8a38b7..41afba95 100644
--- a/middleware/expvar/expvar_test.go
+++ b/middleware/expvar/expvar_test.go
@@ -2,7 +2,7 @@ package expvar
 
 import (
 	"bytes"
-	"io/ioutil"
+	"io"
 	"net/http/httptest"
 	"testing"
 
@@ -23,7 +23,7 @@ func Test_Non_Expvar_Path(t *testing.T) {
 	utils.AssertEqual(t, nil, err)
 	utils.AssertEqual(t, 200, resp.StatusCode)
 
-	b, err := ioutil.ReadAll(resp.Body)
+	b, err := io.ReadAll(resp.Body)
 	utils.AssertEqual(t, nil, err)
 	utils.AssertEqual(t, "escaped", string(b))
 }
@@ -42,7 +42,7 @@ func Test_Expvar_Index(t *testing.T) {
 	utils.AssertEqual(t, 200, resp.StatusCode)
 	utils.AssertEqual(t, fiber.MIMEApplicationJSONCharsetUTF8, resp.Header.Get(fiber.HeaderContentType))
 
-	b, err := ioutil.ReadAll(resp.Body)
+	b, err := io.ReadAll(resp.Body)
 	utils.AssertEqual(t, nil, err)
 	utils.AssertEqual(t, true, bytes.Contains(b, []byte("cmdline")))
 	utils.AssertEqual(t, true, bytes.Contains(b, []byte("memstat")))
@@ -62,7 +62,7 @@ func Test_Expvar_Filter(t *testing.T) {
 	utils.AssertEqual(t, 200, resp.StatusCode)
 	utils.AssertEqual(t, fiber.MIMEApplicationJSONCharsetUTF8, resp.Header.Get(fiber.HeaderContentType))
 
-	b, err := ioutil.ReadAll(resp.Body)
+	b, err := io.ReadAll(resp.Body)
 	utils.AssertEqual(t, nil, err)
 	utils.AssertEqual(t, true, bytes.Contains(b, []byte("cmdline")))
 	utils.AssertEqual(t, false, bytes.Contains(b, []byte("memstat")))
diff --git a/middleware/favicon/favicon.go b/middleware/favicon/favicon.go
index f6e7a7e9..f9d39399 100644
--- a/middleware/favicon/favicon.go
+++ b/middleware/favicon/favicon.go
@@ -1,8 +1,9 @@
 package favicon
 
 import (
-	"io/ioutil"
+	"io"
 	"net/http"
+	"os"
 	"strconv"
 
 	"github.com/gofiber/fiber/v3"
@@ -80,10 +81,10 @@ func New(config ...Config) fiber.Handler {
 			if err != nil {
 				panic(err)
 			}
-			if icon, err = ioutil.ReadAll(f); err != nil {
+			if icon, err = io.ReadAll(f); err != nil {
 				panic(err)
 			}
-		} else if icon, err = ioutil.ReadFile(cfg.File); err != nil {
+		} else if icon, err = os.ReadFile(cfg.File); err != nil {
 			panic(err)
 		}
 
diff --git a/middleware/limiter/limiter_test.go b/middleware/limiter/limiter_test.go
index 010632e3..63e12e96 100644
--- a/middleware/limiter/limiter_test.go
+++ b/middleware/limiter/limiter_test.go
@@ -1,7 +1,7 @@
 package limiter
 
 import (
-	"io/ioutil"
+	"io"
 	"net/http"
 	"net/http/httptest"
 	"sync"
@@ -37,7 +37,7 @@ func Test_Limiter_Concurrency_Store(t *testing.T) {
 		utils.AssertEqual(t, nil, err)
 		utils.AssertEqual(t, fiber.StatusOK, resp.StatusCode)
 
-		body, err := ioutil.ReadAll(resp.Body)
+		body, err := io.ReadAll(resp.Body)
 		utils.AssertEqual(t, nil, err)
 		utils.AssertEqual(t, "Hello tester!", string(body))
 	}
@@ -82,7 +82,7 @@ func Test_Limiter_Concurrency(t *testing.T) {
 		utils.AssertEqual(t, nil, err)
 		utils.AssertEqual(t, fiber.StatusOK, resp.StatusCode)
 
-		body, err := ioutil.ReadAll(resp.Body)
+		body, err := io.ReadAll(resp.Body)
 		utils.AssertEqual(t, nil, err)
 		utils.AssertEqual(t, "Hello tester!", string(body))
 	}
diff --git a/middleware/logger/logger_test.go b/middleware/logger/logger_test.go
index 82db112d..667da0af 100644
--- a/middleware/logger/logger_test.go
+++ b/middleware/logger/logger_test.go
@@ -3,7 +3,7 @@ package logger
 import (
 	"errors"
 	"fmt"
-	"io/ioutil"
+	"io"
 	"net/http"
 	"net/http/httptest"
 	"os"
@@ -265,7 +265,7 @@ func Benchmark_Logger(b *testing.B) {
 
 	app.Use(New(Config{
 		Format: "${bytesReceived} ${bytesSent} ${status}",
-		Output: ioutil.Discard,
+		Output: io.Discard,
 	}))
 	app.Get("/", func(c *fiber.Ctx) error {
 		return c.SendString("Hello, World!")
diff --git a/middleware/monitor/monitor_test.go b/middleware/monitor/monitor_test.go
index 18ea1426..ac6d0607 100644
--- a/middleware/monitor/monitor_test.go
+++ b/middleware/monitor/monitor_test.go
@@ -3,7 +3,7 @@ package monitor
 import (
 	"bytes"
 	"fmt"
-	"io/ioutil"
+	"io"
 	"net/http/httptest"
 	"testing"
 	"time"
@@ -38,7 +38,7 @@ func Test_Monitor_Html(t *testing.T) {
 	utils.AssertEqual(t, 200, resp.StatusCode)
 	utils.AssertEqual(t, fiber.MIMETextHTMLCharsetUTF8,
 		resp.Header.Get(fiber.HeaderContentType))
-	buf, err := ioutil.ReadAll(resp.Body)
+	buf, err := io.ReadAll(resp.Body)
 	utils.AssertEqual(t, nil, err)
 	utils.AssertEqual(t, true, bytes.Contains(buf, []byte("<title>"+defaultTitle+"</title>")))
 	timeoutLine := fmt.Sprintf("setTimeout(fetchJSON, %d)",
@@ -54,7 +54,7 @@ func Test_Monitor_Html(t *testing.T) {
 	utils.AssertEqual(t, 200, resp.StatusCode)
 	utils.AssertEqual(t, fiber.MIMETextHTMLCharsetUTF8,
 		resp.Header.Get(fiber.HeaderContentType))
-	buf, err = ioutil.ReadAll(resp.Body)
+	buf, err = io.ReadAll(resp.Body)
 	utils.AssertEqual(t, nil, err)
 	utils.AssertEqual(t, true, bytes.Contains(buf, []byte("<title>"+conf.Title+"</title>")))
 	timeoutLine = fmt.Sprintf("setTimeout(fetchJSON, %d)",
@@ -77,7 +77,7 @@ func Test_Monitor_JSON(t *testing.T) {
 	utils.AssertEqual(t, 200, resp.StatusCode)
 	utils.AssertEqual(t, fiber.MIMEApplicationJSON, resp.Header.Get(fiber.HeaderContentType))
 
-	b, err := ioutil.ReadAll(resp.Body)
+	b, err := io.ReadAll(resp.Body)
 	utils.AssertEqual(t, nil, err)
 	utils.AssertEqual(t, true, bytes.Contains(b, []byte("pid")))
 	utils.AssertEqual(t, true, bytes.Contains(b, []byte("os")))
@@ -145,7 +145,7 @@ func Test_Monitor_APIOnly(t *testing.T) {
 	utils.AssertEqual(t, 200, resp.StatusCode)
 	utils.AssertEqual(t, fiber.MIMEApplicationJSON, resp.Header.Get(fiber.HeaderContentType))
 
-	b, err := ioutil.ReadAll(resp.Body)
+	b, err := io.ReadAll(resp.Body)
 	utils.AssertEqual(t, nil, err)
 	utils.AssertEqual(t, true, bytes.Contains(b, []byte("pid")))
 	utils.AssertEqual(t, true, bytes.Contains(b, []byte("os")))
diff --git a/middleware/pprof/pprof_test.go b/middleware/pprof/pprof_test.go
index 3114b014..448e2c2e 100644
--- a/middleware/pprof/pprof_test.go
+++ b/middleware/pprof/pprof_test.go
@@ -2,7 +2,7 @@ package pprof
 
 import (
 	"bytes"
-	"io/ioutil"
+	"io"
 	"net/http/httptest"
 	"testing"
 
@@ -23,7 +23,7 @@ func Test_Non_Pprof_Path(t *testing.T) {
 	utils.AssertEqual(t, nil, err)
 	utils.AssertEqual(t, 200, resp.StatusCode)
 
-	b, err := ioutil.ReadAll(resp.Body)
+	b, err := io.ReadAll(resp.Body)
 	utils.AssertEqual(t, nil, err)
 	utils.AssertEqual(t, "escaped", string(b))
 }
@@ -42,7 +42,7 @@ func Test_Pprof_Index(t *testing.T) {
 	utils.AssertEqual(t, 200, resp.StatusCode)
 	utils.AssertEqual(t, fiber.MIMETextHTMLCharsetUTF8, resp.Header.Get(fiber.HeaderContentType))
 
-	b, err := ioutil.ReadAll(resp.Body)
+	b, err := io.ReadAll(resp.Body)
 	utils.AssertEqual(t, nil, err)
 	utils.AssertEqual(t, true, bytes.Contains(b, []byte("<title>/debug/pprof/</title>")))
 }
diff --git a/middleware/proxy/proxy_test.go b/middleware/proxy/proxy_test.go
index c572f65b..1ebfeebf 100644
--- a/middleware/proxy/proxy_test.go
+++ b/middleware/proxy/proxy_test.go
@@ -2,7 +2,7 @@ package proxy
 
 import (
 	"crypto/tls"
-	"io/ioutil"
+	"io"
 	"net"
 	"net/http/httptest"
 	"strings"
@@ -172,7 +172,7 @@ func Test_Proxy_Forward(t *testing.T) {
 	utils.AssertEqual(t, nil, err)
 	utils.AssertEqual(t, fiber.StatusOK, resp.StatusCode)
 
-	b, err := ioutil.ReadAll(resp.Body)
+	b, err := io.ReadAll(resp.Body)
 	utils.AssertEqual(t, nil, err)
 	utils.AssertEqual(t, "forwarded", string(b))
 }
@@ -232,7 +232,7 @@ func Test_Proxy_Modify_Response(t *testing.T) {
 	utils.AssertEqual(t, nil, err)
 	utils.AssertEqual(t, fiber.StatusOK, resp.StatusCode)
 
-	b, err := ioutil.ReadAll(resp.Body)
+	b, err := io.ReadAll(resp.Body)
 	utils.AssertEqual(t, nil, err)
 	utils.AssertEqual(t, "modified response", string(b))
 }
@@ -259,7 +259,7 @@ func Test_Proxy_Modify_Request(t *testing.T) {
 	utils.AssertEqual(t, nil, err)
 	utils.AssertEqual(t, fiber.StatusOK, resp.StatusCode)
 
-	b, err := ioutil.ReadAll(resp.Body)
+	b, err := io.ReadAll(resp.Body)
 	utils.AssertEqual(t, nil, err)
 	utils.AssertEqual(t, "modified request", string(b))
 }
@@ -283,7 +283,7 @@ func Test_Proxy_Timeout_Slow_Server(t *testing.T) {
 	utils.AssertEqual(t, nil, err)
 	utils.AssertEqual(t, fiber.StatusOK, resp.StatusCode)
 
-	b, err := ioutil.ReadAll(resp.Body)
+	b, err := io.ReadAll(resp.Body)
 	utils.AssertEqual(t, nil, err)
 	utils.AssertEqual(t, "fiber is awesome", string(b))
 }
@@ -307,7 +307,7 @@ func Test_Proxy_With_Timeout(t *testing.T) {
 	utils.AssertEqual(t, nil, err)
 	utils.AssertEqual(t, fiber.StatusInternalServerError, resp.StatusCode)
 
-	b, err := ioutil.ReadAll(resp.Body)
+	b, err := io.ReadAll(resp.Body)
 	utils.AssertEqual(t, nil, err)
 	utils.AssertEqual(t, "timeout", string(b))
 }
diff --git a/middleware/timeout/timeout_test.go b/middleware/timeout/timeout_test.go
index dc60e2eb..98d4af22 100644
--- a/middleware/timeout/timeout_test.go
+++ b/middleware/timeout/timeout_test.go
@@ -16,7 +16,7 @@ package timeout
 // 		utils.AssertEqual(t, nil, err, "app.Test(req)")
 // 		utils.AssertEqual(t, fiber.StatusRequestTimeout, resp.StatusCode, "Status code")
 
-// 		body, err := ioutil.ReadAll(resp.Body)
+// 		body, err := io.ReadAll(resp.Body)
 // 		utils.AssertEqual(t, nil, err)
 // 		utils.AssertEqual(t, "Request Timeout", string(body))
 // 	}
@@ -25,7 +25,7 @@ package timeout
 // 		utils.AssertEqual(t, nil, err, "app.Test(req)")
 // 		utils.AssertEqual(t, fiber.StatusOK, resp.StatusCode, "Status code")
 
-// 		body, err := ioutil.ReadAll(resp.Body)
+// 		body, err := io.ReadAll(resp.Body)
 // 		utils.AssertEqual(t, nil, err)
 // 		utils.AssertEqual(t, "After "+timeoutStr+"ms sleeping", string(body))
 // 	}
@@ -49,7 +49,7 @@ package timeout
 // 	utils.AssertEqual(t, nil, err, "app.Test(req)")
 // 	utils.AssertEqual(t, fiber.StatusRequestTimeout, resp.StatusCode, "Status code")
 
-// 	body, err := ioutil.ReadAll(resp.Body)
+// 	body, err := io.ReadAll(resp.Body)
 // 	utils.AssertEqual(t, nil, err)
 // 	utils.AssertEqual(t, "Request Timeout", string(body))
 // }
diff --git a/prefork_test.go b/prefork_test.go
index 08a40cc0..f318ac37 100644
--- a/prefork_test.go
+++ b/prefork_test.go
@@ -6,7 +6,7 @@ package fiber
 
 import (
 	"crypto/tls"
-	"io/ioutil"
+	"io"
 	"os"
 	"testing"
 	"time"
@@ -83,7 +83,7 @@ func Test_App_Prefork_Child_Process_Never_Show_Startup_Message(t *testing.T) {
 
 	utils.AssertEqual(t, nil, w.Close())
 
-	out, err := ioutil.ReadAll(r)
+	out, err := io.ReadAll(r)
 	utils.AssertEqual(t, nil, err)
 	utils.AssertEqual(t, 0, len(out))
 }
diff --git a/router_test.go b/router_test.go
index 49834966..e3adad10 100644
--- a/router_test.go
+++ b/router_test.go
@@ -10,8 +10,9 @@ import (
 	"encoding/json"
 	"errors"
 	"fmt"
-	"io/ioutil"
+	"io"
 	"net/http/httptest"
+	"os"
 	"strings"
 	"testing"
 
@@ -22,7 +23,7 @@ import (
 var routesFixture = routeJSON{}
 
 func init() {
-	dat, err := ioutil.ReadFile("./.github/testdata/testRoutes.json")
+	dat, err := os.ReadFile("./.github/testdata/testRoutes.json")
 	if err != nil {
 		panic(err)
 	}
@@ -42,7 +43,7 @@ func Test_Route_Match_SameLength(t *testing.T) {
 	utils.AssertEqual(t, nil, err, "app.Test(req)")
 	utils.AssertEqual(t, 200, resp.StatusCode, "Status code")
 
-	body, err := ioutil.ReadAll(resp.Body)
+	body, err := io.ReadAll(resp.Body)
 	utils.AssertEqual(t, nil, err, "app.Test(req)")
 	utils.AssertEqual(t, ":param", app.getString(body))
 
@@ -51,7 +52,7 @@ func Test_Route_Match_SameLength(t *testing.T) {
 	utils.AssertEqual(t, nil, err, "app.Test(req)")
 	utils.AssertEqual(t, 200, resp.StatusCode, "Status code")
 
-	body, err = ioutil.ReadAll(resp.Body)
+	body, err = io.ReadAll(resp.Body)
 	utils.AssertEqual(t, nil, err, "app.Test(req)")
 	utils.AssertEqual(t, "test", app.getString(body))
 }
@@ -67,7 +68,7 @@ func Test_Route_Match_Star(t *testing.T) {
 	utils.AssertEqual(t, nil, err, "app.Test(req)")
 	utils.AssertEqual(t, 200, resp.StatusCode, "Status code")
 
-	body, err := ioutil.ReadAll(resp.Body)
+	body, err := io.ReadAll(resp.Body)
 	utils.AssertEqual(t, nil, err, "app.Test(req)")
 	utils.AssertEqual(t, "*", app.getString(body))
 
@@ -76,7 +77,7 @@ func Test_Route_Match_Star(t *testing.T) {
 	utils.AssertEqual(t, nil, err, "app.Test(req)")
 	utils.AssertEqual(t, 200, resp.StatusCode, "Status code")
 
-	body, err = ioutil.ReadAll(resp.Body)
+	body, err = io.ReadAll(resp.Body)
 	utils.AssertEqual(t, nil, err, "app.Test(req)")
 	utils.AssertEqual(t, "test", app.getString(body))
 
@@ -113,7 +114,7 @@ func Test_Route_Match_Root(t *testing.T) {
 	utils.AssertEqual(t, nil, err, "app.Test(req)")
 	utils.AssertEqual(t, 200, resp.StatusCode, "Status code")
 
-	body, err := ioutil.ReadAll(resp.Body)
+	body, err := io.ReadAll(resp.Body)
 	utils.AssertEqual(t, nil, err, "app.Test(req)")
 	utils.AssertEqual(t, "root", app.getString(body))
 }
@@ -131,7 +132,7 @@ func Test_Route_Match_Parser(t *testing.T) {
 	utils.AssertEqual(t, nil, err, "app.Test(req)")
 	utils.AssertEqual(t, 200, resp.StatusCode, "Status code")
 
-	body, err := ioutil.ReadAll(resp.Body)
+	body, err := io.ReadAll(resp.Body)
 	utils.AssertEqual(t, nil, err, "app.Test(req)")
 	utils.AssertEqual(t, "bar", app.getString(body))
 
@@ -140,7 +141,7 @@ func Test_Route_Match_Parser(t *testing.T) {
 	utils.AssertEqual(t, nil, err, "app.Test(req)")
 	utils.AssertEqual(t, 200, resp.StatusCode, "Status code")
 
-	body, err = ioutil.ReadAll(resp.Body)
+	body, err = io.ReadAll(resp.Body)
 	utils.AssertEqual(t, nil, err, "app.Test(req)")
 	utils.AssertEqual(t, "test", app.getString(body))
 }
@@ -156,7 +157,7 @@ func Test_Route_Match_Middleware(t *testing.T) {
 	utils.AssertEqual(t, nil, err, "app.Test(req)")
 	utils.AssertEqual(t, 200, resp.StatusCode, "Status code")
 
-	body, err := ioutil.ReadAll(resp.Body)
+	body, err := io.ReadAll(resp.Body)
 	utils.AssertEqual(t, nil, err, "app.Test(req)")
 	utils.AssertEqual(t, "*", app.getString(body))
 
@@ -165,7 +166,7 @@ func Test_Route_Match_Middleware(t *testing.T) {
 	utils.AssertEqual(t, nil, err, "app.Test(req)")
 	utils.AssertEqual(t, 200, resp.StatusCode, "Status code")
 
-	body, err = ioutil.ReadAll(resp.Body)
+	body, err = io.ReadAll(resp.Body)
 	utils.AssertEqual(t, nil, err, "app.Test(req)")
 	utils.AssertEqual(t, "bar/fasel", app.getString(body))
 }
@@ -181,7 +182,7 @@ func Test_Route_Match_UnescapedPath(t *testing.T) {
 	utils.AssertEqual(t, nil, err, "app.Test(req)")
 	utils.AssertEqual(t, StatusOK, resp.StatusCode, "Status code")
 
-	body, err := ioutil.ReadAll(resp.Body)
+	body, err := io.ReadAll(resp.Body)
 	utils.AssertEqual(t, nil, err, "app.Test(req)")
 	utils.AssertEqual(t, "test", app.getString(body))
 	// without special chars
@@ -217,7 +218,7 @@ func Test_Route_Match_WithEscapeChar(t *testing.T) {
 	utils.AssertEqual(t, nil, err, "app.Test(req)")
 	utils.AssertEqual(t, StatusOK, resp.StatusCode, "Status code")
 
-	body, err := ioutil.ReadAll(resp.Body)
+	body, err := io.ReadAll(resp.Body)
 	utils.AssertEqual(t, nil, err, "app.Test(req)")
 	utils.AssertEqual(t, "static", app.getString(body))
 
@@ -226,7 +227,7 @@ func Test_Route_Match_WithEscapeChar(t *testing.T) {
 	utils.AssertEqual(t, nil, err, "app.Test(req)")
 	utils.AssertEqual(t, StatusOK, resp.StatusCode, "Status code")
 
-	body, err = ioutil.ReadAll(resp.Body)
+	body, err = io.ReadAll(resp.Body)
 	utils.AssertEqual(t, nil, err, "app.Test(req)")
 	utils.AssertEqual(t, "group", app.getString(body))
 
@@ -235,7 +236,7 @@ func Test_Route_Match_WithEscapeChar(t *testing.T) {
 	utils.AssertEqual(t, nil, err, "app.Test(req)")
 	utils.AssertEqual(t, StatusOK, resp.StatusCode, "Status code")
 
-	body, err = ioutil.ReadAll(resp.Body)
+	body, err = io.ReadAll(resp.Body)
 	utils.AssertEqual(t, nil, err, "app.Test(req)")
 	utils.AssertEqual(t, "awesome", app.getString(body))
 }
@@ -251,7 +252,7 @@ func Test_Route_Match_Middleware_HasPrefix(t *testing.T) {
 	utils.AssertEqual(t, nil, err, "app.Test(req)")
 	utils.AssertEqual(t, 200, resp.StatusCode, "Status code")
 
-	body, err := ioutil.ReadAll(resp.Body)
+	body, err := io.ReadAll(resp.Body)
 	utils.AssertEqual(t, nil, err, "app.Test(req)")
 	utils.AssertEqual(t, "middleware", app.getString(body))
 }
@@ -267,7 +268,7 @@ func Test_Route_Match_Middleware_Root(t *testing.T) {
 	utils.AssertEqual(t, nil, err, "app.Test(req)")
 	utils.AssertEqual(t, 200, resp.StatusCode, "Status code")
 
-	body, err := ioutil.ReadAll(resp.Body)
+	body, err := io.ReadAll(resp.Body)
 	utils.AssertEqual(t, nil, err, "app.Test(req)")
 	utils.AssertEqual(t, "middleware", app.getString(body))
 }
@@ -324,7 +325,7 @@ func Test_Route_Static_Root(t *testing.T) {
 	utils.AssertEqual(t, nil, err, "app.Test(req)")
 	utils.AssertEqual(t, 200, resp.StatusCode, "Status code")
 
-	body, err := ioutil.ReadAll(resp.Body)
+	body, err := io.ReadAll(resp.Body)
 	utils.AssertEqual(t, nil, err, "app.Test(req)")
 	utils.AssertEqual(t, true, strings.Contains(app.getString(body), "color"))
 
@@ -339,7 +340,7 @@ func Test_Route_Static_Root(t *testing.T) {
 	utils.AssertEqual(t, nil, err, "app.Test(req)")
 	utils.AssertEqual(t, 200, resp.StatusCode, "Status code")
 
-	body, err = ioutil.ReadAll(resp.Body)
+	body, err = io.ReadAll(resp.Body)
 	utils.AssertEqual(t, nil, err, "app.Test(req)")
 	utils.AssertEqual(t, true, strings.Contains(app.getString(body), "color"))
 }
@@ -363,7 +364,7 @@ func Test_Route_Static_HasPrefix(t *testing.T) {
 	utils.AssertEqual(t, nil, err, "app.Test(req)")
 	utils.AssertEqual(t, 200, resp.StatusCode, "Status code")
 
-	body, err := ioutil.ReadAll(resp.Body)
+	body, err := io.ReadAll(resp.Body)
 	utils.AssertEqual(t, nil, err, "app.Test(req)")
 	utils.AssertEqual(t, true, strings.Contains(app.getString(body), "color"))
 
@@ -384,7 +385,7 @@ func Test_Route_Static_HasPrefix(t *testing.T) {
 	utils.AssertEqual(t, nil, err, "app.Test(req)")
 	utils.AssertEqual(t, 200, resp.StatusCode, "Status code")
 
-	body, err = ioutil.ReadAll(resp.Body)
+	body, err = io.ReadAll(resp.Body)
 	utils.AssertEqual(t, nil, err, "app.Test(req)")
 	utils.AssertEqual(t, true, strings.Contains(app.getString(body), "color"))
 
@@ -403,7 +404,7 @@ func Test_Route_Static_HasPrefix(t *testing.T) {
 	utils.AssertEqual(t, nil, err, "app.Test(req)")
 	utils.AssertEqual(t, 200, resp.StatusCode, "Status code")
 
-	body, err = ioutil.ReadAll(resp.Body)
+	body, err = io.ReadAll(resp.Body)
 	utils.AssertEqual(t, nil, err, "app.Test(req)")
 	utils.AssertEqual(t, true, strings.Contains(app.getString(body), "color"))
 
@@ -422,7 +423,7 @@ func Test_Route_Static_HasPrefix(t *testing.T) {
 	utils.AssertEqual(t, nil, err, "app.Test(req)")
 	utils.AssertEqual(t, 200, resp.StatusCode, "Status code")
 
-	body, err = ioutil.ReadAll(resp.Body)
+	body, err = io.ReadAll(resp.Body)
 	utils.AssertEqual(t, nil, err, "app.Test(req)")
 	utils.AssertEqual(t, true, strings.Contains(app.getString(body), "color"))
 }