diff --git a/internal/openvpn/auth.go b/internal/openvpn/auth.go
index b832d84a..8279d5b9 100644
--- a/internal/openvpn/auth.go
+++ b/internal/openvpn/auth.go
@@ -2,7 +2,6 @@ package openvpn
 
 import (
 	"fmt"
-	"io/ioutil"
 	"os"
 	"strings"
 )
@@ -39,7 +38,7 @@ func writeIfDifferent(path, content string, puid, pgid int) (err error) {
 	}
 
 	if writeData {
-		err = ioutil.WriteFile(path, []byte(content), perm)
+		err = os.WriteFile(path, []byte(content), perm)
 		if err != nil {
 			return fmt.Errorf("writing file: %w", err)
 		}
diff --git a/internal/pprof/server_test.go b/internal/pprof/server_test.go
index e5db82ff..a421da31 100644
--- a/internal/pprof/server_test.go
+++ b/internal/pprof/server_test.go
@@ -2,7 +2,7 @@ package pprof
 
 import (
 	"context"
-	"io/ioutil"
+	"io"
 	"net/http"
 	"testing"
 	"time"
@@ -96,7 +96,7 @@ func Test_Server(t *testing.T) {
 		assert.Equalf(t, http.StatusOK, httpResult.response.StatusCode,
 			"unexpected status code for URL %s: %s", httpResult.url, http.StatusText(httpResult.response.StatusCode))
 
-		b, err := ioutil.ReadAll(httpResult.response.Body)
+		b, err := io.ReadAll(httpResult.response.Body)
 		require.NoErrorf(t, err, "unexpected error for URL %s: %s", httpResult.url, err)
 		assert.NotEmptyf(t, b, "response body is empty for URL %s", httpResult.url)
 
diff --git a/internal/provider/ivpn/updater/api_test.go b/internal/provider/ivpn/updater/api_test.go
index 48b5dc98..6b814c6e 100644
--- a/internal/provider/ivpn/updater/api_test.go
+++ b/internal/provider/ivpn/updater/api_test.go
@@ -4,7 +4,6 @@ import (
 	"context"
 	"errors"
 	"io"
-	"io/ioutil"
 	"net/http"
 	"strings"
 	"testing"
@@ -32,11 +31,11 @@ func Test_fetchAPI(t *testing.T) {
 		},
 		"no server": {
 			responseStatus: http.StatusOK,
-			responseBody:   ioutil.NopCloser(strings.NewReader(`{}`)),
+			responseBody:   io.NopCloser(strings.NewReader(`{}`)),
 		},
 		"success": {
 			responseStatus: http.StatusOK,
-			responseBody: ioutil.NopCloser(strings.NewReader(`{"servers":[
+			responseBody: io.NopCloser(strings.NewReader(`{"servers":[
 				{"country":"Country1","city":"City A","isp":"xyz","is_active":true,"hostnames":{"openvpn":"hosta"}},
 				{"country":"Country2","city":"City B","isp":"abc","is_active":false,"hostnames":{"openvpn":"hostb"}}
 			]}`)),
diff --git a/internal/provider/ivpn/updater/servers_test.go b/internal/provider/ivpn/updater/servers_test.go
index 1f2a498a..a9da4634 100644
--- a/internal/provider/ivpn/updater/servers_test.go
+++ b/internal/provider/ivpn/updater/servers_test.go
@@ -3,7 +3,7 @@ package updater
 import (
 	"context"
 	"errors"
-	"io/ioutil"
+	"io"
 	"net"
 	"net/http"
 	"strings"
@@ -145,7 +145,7 @@ func Test_Updater_GetServers(t *testing.T) {
 					return &http.Response{
 						StatusCode: testCase.responseStatus,
 						Status:     http.StatusText(testCase.responseStatus),
-						Body:       ioutil.NopCloser(strings.NewReader(testCase.responseBody)),
+						Body:       io.NopCloser(strings.NewReader(testCase.responseBody)),
 					}, nil
 				}),
 			}
diff --git a/internal/provider/slickvpn/updater/website_test.go b/internal/provider/slickvpn/updater/website_test.go
index b6bb4486..4efed74a 100644
--- a/internal/provider/slickvpn/updater/website_test.go
+++ b/internal/provider/slickvpn/updater/website_test.go
@@ -3,7 +3,6 @@ package updater
 import (
 	"context"
 	"io"
-	"io/ioutil"
 	"net/http"
 	"strings"
 	"testing"
@@ -41,7 +40,7 @@ func Test_fetchServers(t *testing.T) {
 			ctx:            context.Background(),
 			responseStatus: http.StatusOK,
 			//nolint:lll
-			responseBody: ioutil.NopCloser(strings.NewReader(`
+			responseBody: io.NopCloser(strings.NewReader(`
 			<div>
 				<table id="location-table">
 					<tbody>
diff --git a/internal/provider/surfshark/updater/api_test.go b/internal/provider/surfshark/updater/api_test.go
index 58030394..fc428b37 100644
--- a/internal/provider/surfshark/updater/api_test.go
+++ b/internal/provider/surfshark/updater/api_test.go
@@ -4,7 +4,6 @@ import (
 	"context"
 	"errors"
 	"io"
-	"io/ioutil"
 	"net/http"
 	"strings"
 	"testing"
@@ -34,7 +33,7 @@ func Test_addServersFromAPI(t *testing.T) {
 				"existinghost": {Hostname: "existinghost"},
 			},
 			responseStatus: http.StatusOK,
-			responseBody: ioutil.NopCloser(strings.NewReader(`[
+			responseBody: io.NopCloser(strings.NewReader(`[
 				{"connectionName":"host1","region":"region1","country":"country1","location":"location1"},
 				{"connectionName":"host2","region":"region2","country":"country1","location":"location2"}
 			]`)),
@@ -111,12 +110,12 @@ func Test_fetchAPI(t *testing.T) {
 		},
 		"no server": {
 			responseStatus: http.StatusOK,
-			responseBody:   ioutil.NopCloser(strings.NewReader(`[]`)),
+			responseBody:   io.NopCloser(strings.NewReader(`[]`)),
 			data:           []serverData{},
 		},
 		"success": {
 			responseStatus: http.StatusOK,
-			responseBody: ioutil.NopCloser(strings.NewReader(`[
+			responseBody: io.NopCloser(strings.NewReader(`[
 				{"connectionName":"host1","region":"region1","country":"country1","location":"location1"},
 				{"connectionName":"host2","region":"region2","country":"country1","location":"location2"}
 			]`)),
diff --git a/internal/provider/vpnsecure/updater/website_test.go b/internal/provider/vpnsecure/updater/website_test.go
index a3771d60..038655e0 100644
--- a/internal/provider/vpnsecure/updater/website_test.go
+++ b/internal/provider/vpnsecure/updater/website_test.go
@@ -3,7 +3,6 @@ package updater
 import (
 	"context"
 	"io"
-	"io/ioutil"
 	"net/http"
 	"strings"
 	"testing"
@@ -43,7 +42,7 @@ func Test_fetchServers(t *testing.T) {
 		"success": {
 			ctx:            context.Background(),
 			responseStatus: http.StatusOK,
-			responseBody: ioutil.NopCloser(strings.NewReader(`
+			responseBody: io.NopCloser(strings.NewReader(`
 			<div class="blk blk--white locations-list">
 				<div class="blk__i">
 					<div>
diff --git a/internal/updater/html/fetch_test.go b/internal/updater/html/fetch_test.go
index 7e29fa79..a80abcd2 100644
--- a/internal/updater/html/fetch_test.go
+++ b/internal/updater/html/fetch_test.go
@@ -3,7 +3,6 @@ package html
 import (
 	"context"
 	"io"
-	"io/ioutil"
 	"net/http"
 	"strings"
 	"testing"
@@ -59,7 +58,7 @@ func Test_Fetch(t *testing.T) {
 			url:            "https://example.com/path",
 			responseStatus: http.StatusOK,
 			rootNode:       parseTestHTML(t, "some body"),
-			responseBody:   ioutil.NopCloser(strings.NewReader("some body")),
+			responseBody:   io.NopCloser(strings.NewReader("some body")),
 		},
 	}