diff --git a/internal/cli/clientkey.go b/internal/cli/clientkey.go
index b6801bb1..f4a88714 100644
--- a/internal/cli/clientkey.go
+++ b/internal/cli/clientkey.go
@@ -3,7 +3,7 @@ package cli
 import (
 	"flag"
 	"fmt"
-	"io/ioutil"
+	"io"
 	"strings"
 
 	"github.com/qdm12/gluetun/internal/constants"
@@ -20,7 +20,7 @@ func (c *cli) ClientKey(args []string, openFile os.OpenFileFunc) error {
 	if err != nil {
 		return err
 	}
-	data, err := ioutil.ReadAll(file)
+	data, err := io.ReadAll(file)
 	if err != nil {
 		_ = file.Close()
 		return err
diff --git a/internal/configuration/secrets.go b/internal/configuration/secrets.go
index 610bdb69..88e845eb 100644
--- a/internal/configuration/secrets.go
+++ b/internal/configuration/secrets.go
@@ -3,7 +3,7 @@ package configuration
 import (
 	"errors"
 	"fmt"
-	"io/ioutil"
+	"io"
 	"strings"
 
 	"github.com/qdm12/golibs/os"
@@ -49,7 +49,7 @@ func (r *reader) getFromEnvOrSecretFile(envKey string, compulsory bool, retroKey
 		return "", fmt.Errorf("%w: %s", ErrReadSecretFile, fileErr)
 	}
 
-	b, err := ioutil.ReadAll(file)
+	b, err := io.ReadAll(file)
 	if err != nil {
 		return "", fmt.Errorf("%w: %s", ErrReadSecretFile, err)
 	}
@@ -97,7 +97,7 @@ func readFromFile(openFile os.OpenFileFunc, filepath string) (b []byte, err erro
 	if err != nil {
 		return nil, err
 	}
-	b, err = ioutil.ReadAll(file)
+	b, err = io.ReadAll(file)
 	if err != nil {
 		_ = file.Close()
 		return nil, err
diff --git a/internal/firewall/iptables.go b/internal/firewall/iptables.go
index fccbacba..69385c6a 100644
--- a/internal/firewall/iptables.go
+++ b/internal/firewall/iptables.go
@@ -4,7 +4,7 @@ import (
 	"context"
 	"errors"
 	"fmt"
-	"io/ioutil"
+	"io"
 	"net"
 	"os"
 	"strings"
@@ -199,7 +199,7 @@ func (c *configurator) runUserPostRules(ctx context.Context, filepath string, re
 	} else if err != nil {
 		return err
 	}
-	b, err := ioutil.ReadAll(file)
+	b, err := io.ReadAll(file)
 	if err != nil {
 		_ = file.Close()
 		return err
diff --git a/internal/healthcheck/client.go b/internal/healthcheck/client.go
index 4a0c3e0c..1904a8eb 100644
--- a/internal/healthcheck/client.go
+++ b/internal/healthcheck/client.go
@@ -3,7 +3,7 @@ package healthcheck
 import (
 	"context"
 	"fmt"
-	"io/ioutil"
+	"io"
 	"net/http"
 )
 
@@ -34,7 +34,7 @@ func (h *checker) Check(ctx context.Context, url string) error {
 	if response.StatusCode == http.StatusOK {
 		return nil
 	}
-	b, err := ioutil.ReadAll(response.Body)
+	b, err := io.ReadAll(response.Body)
 	if err != nil {
 		return err
 	}
diff --git a/internal/openvpn/auth.go b/internal/openvpn/auth.go
index 06ba129c..24ee0e11 100644
--- a/internal/openvpn/auth.go
+++ b/internal/openvpn/auth.go
@@ -1,7 +1,7 @@
 package openvpn
 
 import (
-	"io/ioutil"
+	"io"
 	"os"
 	"strings"
 
@@ -34,7 +34,7 @@ func (c *configurator) WriteAuthFile(user, password string, puid, pgid int) erro
 		return file.Close()
 	}
 
-	data, err := ioutil.ReadAll(file)
+	data, err := io.ReadAll(file)
 	if err != nil {
 		_ = file.Close()
 		return err
diff --git a/internal/provider/privateinternetaccess/portforward.go b/internal/provider/privateinternetaccess/portforward.go
index ab15e3dd..180e6b80 100644
--- a/internal/provider/privateinternetaccess/portforward.go
+++ b/internal/provider/privateinternetaccess/portforward.go
@@ -6,7 +6,7 @@ import (
 	"encoding/json"
 	"errors"
 	"fmt"
-	"io/ioutil"
+	"io"
 	"net"
 	"net/http"
 	"net/url"
@@ -326,7 +326,7 @@ func getOpenvpnCredentials(openFile os.OpenFileFunc) (username, password string,
 		return "", "", fmt.Errorf("%w: %s", errAuthFileRead, err)
 	}
 
-	authData, err := ioutil.ReadAll(file)
+	authData, err := io.ReadAll(file)
 	if err != nil {
 		_ = file.Close()
 		return "", "", fmt.Errorf("%w: %s", errAuthFileRead, err)
@@ -495,7 +495,7 @@ func makeNOKStatusError(response *http.Response, substitutions map[string]string
 	url := response.Request.URL.String()
 	url = replaceInString(url, substitutions)
 
-	b, _ := ioutil.ReadAll(response.Body)
+	b, _ := io.ReadAll(response.Body)
 	shortenMessage := string(b)
 	shortenMessage = strings.ReplaceAll(shortenMessage, "\n", "")
 	shortenMessage = strings.ReplaceAll(shortenMessage, "  ", " ")
diff --git a/internal/publicip/publicip.go b/internal/publicip/publicip.go
index 87e1994f..8859dadb 100644
--- a/internal/publicip/publicip.go
+++ b/internal/publicip/publicip.go
@@ -4,7 +4,7 @@ package publicip
 import (
 	"context"
 	"fmt"
-	"io/ioutil"
+	"io"
 	"math/rand"
 	"net"
 	"net/http"
@@ -55,7 +55,7 @@ func (i *ipGetter) Get(ctx context.Context) (ip net.IP, err error) {
 		return nil, fmt.Errorf("%w from %s: %s", ErrBadStatusCode, url, response.Status)
 	}
 
-	content, err := ioutil.ReadAll(response.Body)
+	content, err := io.ReadAll(response.Body)
 	if err != nil {
 		return nil, fmt.Errorf("%w: %s", ErrCannotReadBody, err)
 	}
diff --git a/internal/updater/providers/pia/api.go b/internal/updater/providers/pia/api.go
index 7e2b7143..c142de96 100644
--- a/internal/updater/providers/pia/api.go
+++ b/internal/updater/providers/pia/api.go
@@ -6,7 +6,7 @@ import (
 	"encoding/json"
 	"errors"
 	"fmt"
-	"io/ioutil"
+	"io"
 	"net"
 	"net/http"
 )
@@ -54,7 +54,7 @@ func fetchAPI(ctx context.Context, client *http.Client) (
 		return data, fmt.Errorf("%w: %s", ErrHTTPStatusCodeNotOK, response.Status)
 	}
 
-	b, err := ioutil.ReadAll(response.Body)
+	b, err := io.ReadAll(response.Body)
 	if err != nil {
 		return data, err
 	}
diff --git a/internal/updater/unzip/extract.go b/internal/updater/unzip/extract.go
index 87bbbf9b..f0e86a55 100644
--- a/internal/updater/unzip/extract.go
+++ b/internal/updater/unzip/extract.go
@@ -3,7 +3,7 @@ package unzip
 import (
 	"archive/zip"
 	"bytes"
-	"io/ioutil"
+	"io"
 	"path/filepath"
 	"strings"
 )
@@ -24,7 +24,7 @@ func zipExtractAll(zipBytes []byte) (contents map[string][]byte, err error) {
 			return nil, err
 		}
 		defer f.Close()
-		contents[fileName], err = ioutil.ReadAll(f)
+		contents[fileName], err = io.ReadAll(f)
 		if err != nil {
 			return nil, err
 		}
diff --git a/internal/updater/unzip/fetch.go b/internal/updater/unzip/fetch.go
index 8fdb1920..12cc8cb8 100644
--- a/internal/updater/unzip/fetch.go
+++ b/internal/updater/unzip/fetch.go
@@ -4,7 +4,7 @@ import (
 	"context"
 	"errors"
 	"fmt"
-	"io/ioutil"
+	"io"
 	"net/http"
 )
 
@@ -31,7 +31,7 @@ func (u *unzipper) FetchAndExtract(ctx context.Context, url string) (
 		return nil, fmt.Errorf("%w: %s for %s", ErrHTTPStatusCodeNotOK, response.Status, url)
 	}
 
-	b, err := ioutil.ReadAll(response.Body)
+	b, err := io.ReadAll(response.Body)
 	if err != nil {
 		return nil, err
 	}