diff --git a/pgconn/config.go b/pgconn/config.go
index 6282f41b..005d3fe2 100644
--- a/pgconn/config.go
+++ b/pgconn/config.go
@@ -8,7 +8,6 @@ import (
 	"errors"
 	"fmt"
 	"io"
-	"io/ioutil"
 	"math"
 	"net"
 	"net/url"
@@ -687,7 +686,7 @@ func configTLS(settings map[string]string, thisHost string, parseConfigOptions P
 		caCertPool := x509.NewCertPool()
 
 		caPath := sslrootcert
-		caCert, err := ioutil.ReadFile(caPath)
+		caCert, err := os.ReadFile(caPath)
 		if err != nil {
 			return nil, fmt.Errorf("unable to read CA file: %w", err)
 		}
@@ -705,7 +704,7 @@ func configTLS(settings map[string]string, thisHost string, parseConfigOptions P
 	}
 
 	if sslcert != "" && sslkey != "" {
-		buf, err := ioutil.ReadFile(sslkey)
+		buf, err := os.ReadFile(sslkey)
 		if err != nil {
 			return nil, fmt.Errorf("unable to read sslkey: %w", err)
 		}
@@ -744,7 +743,7 @@ func configTLS(settings map[string]string, thisHost string, parseConfigOptions P
 		} else {
 			pemKey = pem.EncodeToMemory(block)
 		}
-		certfile, err := ioutil.ReadFile(sslcert)
+		certfile, err := os.ReadFile(sslcert)
 		if err != nil {
 			return nil, fmt.Errorf("unable to read cert: %w", err)
 		}
diff --git a/pgconn/config_test.go b/pgconn/config_test.go
index ff5c8a76..963455f7 100644
--- a/pgconn/config_test.go
+++ b/pgconn/config_test.go
@@ -4,7 +4,6 @@ import (
 	"context"
 	"crypto/tls"
 	"fmt"
-	"io/ioutil"
 	"os"
 	"os/user"
 	"runtime"
@@ -1031,7 +1030,7 @@ func TestParseConfigEnvLibpq(t *testing.T) {
 func TestParseConfigReadsPgPassfile(t *testing.T) {
 	t.Parallel()
 
-	tf, err := ioutil.TempFile("", "")
+	tf, err := os.CreateTemp("", "")
 	require.NoError(t, err)
 
 	defer tf.Close()
@@ -1060,7 +1059,7 @@ func TestParseConfigReadsPgPassfile(t *testing.T) {
 func TestParseConfigReadsPgServiceFile(t *testing.T) {
 	t.Parallel()
 
-	tf, err := ioutil.TempFile("", "")
+	tf, err := os.CreateTemp("", "")
 	require.NoError(t, err)
 
 	defer tf.Close()
diff --git a/pgconn/pgconn_test.go b/pgconn/pgconn_test.go
index 3b1ce436..0a2240a1 100644
--- a/pgconn/pgconn_test.go
+++ b/pgconn/pgconn_test.go
@@ -8,7 +8,6 @@ import (
 	"errors"
 	"fmt"
 	"io"
-	"io/ioutil"
 	"log"
 	"math"
 	"net"
@@ -1819,7 +1818,7 @@ func TestConnCopyFromGzipReader(t *testing.T) {
 	)`).ReadAll()
 	require.NoError(t, err)
 
-	f, err := ioutil.TempFile("", "*")
+	f, err := os.CreateTemp("", "*")
 	require.NoError(t, err)
 
 	gw := gzip.NewWriter(f)