diff --git a/cmd/cassowary/cli.go b/cmd/cassowary/cli.go
index 9bf1b44..daa0eeb 100644
--- a/cmd/cassowary/cli.go
+++ b/cmd/cassowary/cli.go
@@ -6,7 +6,6 @@ import (
 	"encoding/json"
 	"errors"
 	"fmt"
-	"io/ioutil"
 	"os"
 	"strconv"
 
@@ -180,7 +179,7 @@ func validateCLI(c *cli.Context) error {
 	}
 
 	if c.String("ca") != "" {
-		pemCerts, err := ioutil.ReadFile(c.String("ca"))
+		pemCerts, err := os.ReadFile(c.String("ca"))
 		if err != nil {
 			return err
 		}
diff --git a/cmd/cassowary/fileops.go b/cmd/cassowary/fileops.go
index bad6306..5cf666c 100644
--- a/cmd/cassowary/fileops.go
+++ b/cmd/cassowary/fileops.go
@@ -3,7 +3,6 @@ package main
 import (
 	"bufio"
 	"io"
-	"io/ioutil"
 	"net/http"
 	"os"
 	"path/filepath"
@@ -38,7 +37,7 @@ func downloadPath(url string) (string, error) {
 }
 
 func readFile(file string) ([]byte, error) {
-	fileContent, err := ioutil.ReadFile(file)
+	fileContent, err := os.ReadFile(file)
 	if err != nil {
 		return []byte{}, err
 	}
diff --git a/pkg/client/load.go b/pkg/client/load.go
index 1a2f23f..84a14d5 100644
--- a/pkg/client/load.go
+++ b/pkg/client/load.go
@@ -7,7 +7,6 @@ import (
 	"encoding/csv"
 	"fmt"
 	"io"
-	"io/ioutil"
 	"log"
 	"net/http"
 	"net/http/httptrace"
@@ -102,7 +101,7 @@ func (c *Cassowary) runLoadTest(outPutChan chan<- durationMetrics, workerChan ch
 			log.Fatalf("%v", err)
 		}
 		if resp != nil {
-			_, err = io.Copy(ioutil.Discard, resp.Body)
+			_, err = io.Copy(io.Discard, resp.Body)
 			if err != nil {
 				fmt.Println("Failed to read HTTP response body", err)
 			}
diff --git a/pkg/client/load_test.go b/pkg/client/load_test.go
index 94bea3d..0006fe1 100644
--- a/pkg/client/load_test.go
+++ b/pkg/client/load_test.go
@@ -3,9 +3,9 @@ package client
 import (
 	"crypto/tls"
 	"crypto/x509"
-	"io/ioutil"
 	"net/http"
 	"net/http/httptest"
+	"os"
 	"testing"
 )
 
@@ -83,7 +83,7 @@ func TestCoordinateTLSConfig(t *testing.T) {
 		w.Write([]byte("ok"))
 	}))
 
-	pemCerts, err := ioutil.ReadFile("testdata/ca.pem")
+	pemCerts, err := os.ReadFile("testdata/ca.pem")
 	if err != nil {
 		t.Fatal("Invalid ca.pem path")
 	}
diff --git a/pkg/client/promgwpush_test.go b/pkg/client/promgwpush_test.go
index 5d03296..0b3c166 100644
--- a/pkg/client/promgwpush_test.go
+++ b/pkg/client/promgwpush_test.go
@@ -1,7 +1,7 @@
 package client
 
 import (
-	"io/ioutil"
+	"io"
 	"net/http"
 	"net/http/httptest"
 	"testing"
@@ -18,7 +18,7 @@ func TestPromGwPush(t *testing.T) {
 		http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
 			lastMethod = r.Method
 			var err error
-			_, err = ioutil.ReadAll(r.Body)
+			_, err = io.ReadAll(r.Body)
 			if err != nil {
 				t.Fatal(err)
 			}