diff --git a/.github/workflows/test-and-deploy.yml b/.github/workflows/test-and-deploy.yml
index 45dbc4c3..f447a23c 100644
--- a/.github/workflows/test-and-deploy.yml
+++ b/.github/workflows/test-and-deploy.yml
@@ -17,7 +17,7 @@ jobs:
     timeout-minutes: 20
     strategy:
       matrix:
-        go: [ '1.14', '1.15', '1.16', '1.17' ]
+        go: [ '1.14', '1.15', '1.16', '1.17', '1.18', '1.19' ]
     env:
       DOCKER_LOGIN: ${{ secrets.DOCKER_USERNAME && secrets.DOCKER_AUTH_TOKEN }}
     steps:
diff --git a/README.md b/README.md
index a8042e11..6a2130cd 100644
--- a/README.md
+++ b/README.md
@@ -39,6 +39,8 @@ This library supports the following Go implementations:
 * Go 1.15
 * Go 1.16
 * Go 1.17
+* Go 1.18
+* Go 1.19
 
 ## Prerequisites
 
diff --git a/helpers/inbound/inbound.go b/helpers/inbound/inbound.go
index 3c688fca..ba7f0b89 100644
--- a/helpers/inbound/inbound.go
+++ b/helpers/inbound/inbound.go
@@ -4,7 +4,6 @@ import (
 	"encoding/json"
 	"fmt"
 	"io"
-	"io/ioutil"
 	"mime"
 	"mime/multipart"
 	"net/http"
@@ -184,7 +183,7 @@ func (email *ParsedEmail) parseRawEmail(rawEmail string) error {
 					break
 				}
 				header := emailBodyPart.Header.Get("Content-Type")
-				b, err := ioutil.ReadAll(emailPart)
+				b, err := io.ReadAll(emailPart)
 				if err != nil {
 					return err
 				}
@@ -192,14 +191,14 @@ func (email *ParsedEmail) parseRawEmail(rawEmail string) error {
 			}
 
 		} else if emailPart.FileName() != "" {
-			b, err := ioutil.ReadAll(emailPart)
+			b, err := io.ReadAll(emailPart)
 			if err != nil {
 				return err
 			}
 			email.Attachments[emailPart.FileName()] = b
 		} else {
 			header := emailPart.Header.Get("Content-Type")
-			b, err := ioutil.ReadAll(emailPart)
+			b, err := io.ReadAll(emailPart)
 			if err != nil {
 				return err
 			}
diff --git a/helpers/inbound/inbound_test.go b/helpers/inbound/inbound_test.go
index d776f767..4dac61ab 100644
--- a/helpers/inbound/inbound_test.go
+++ b/helpers/inbound/inbound_test.go
@@ -3,16 +3,16 @@ package inbound
 import (
 	"bytes"
 	"fmt"
-	"io/ioutil"
 	"log"
 	"net/http"
+	"os"
 	"testing"
 
 	"github.com/stretchr/testify/assert"
 )
 
 func createRequest(filename string) *http.Request {
-	file, err := ioutil.ReadFile(filename)
+	file, err := os.ReadFile(filename)
 	if err != nil {
 		return nil
 	}
diff --git a/sendgrid_test.go b/sendgrid_test.go
index 974a5ef8..f4557bd6 100644
--- a/sendgrid_test.go
+++ b/sendgrid_test.go
@@ -4,7 +4,6 @@ import (
 	"context"
 	"encoding/json"
 	"fmt"
-	"io/ioutil"
 	"net/http"
 	"net/http/httptest"
 	"os"
@@ -19,7 +18,7 @@ import (
 )
 
 func TestLicenseYear(t *testing.T) {
-	d, err := ioutil.ReadFile("LICENSE")
+	d, err := os.ReadFile("LICENSE")
 	assert.Nil(t, err, "Cannot read the LICENSE file")
 	l := fmt.Sprintf("Copyright (C) %v, Twilio SendGrid, Inc.", time.Now().Year())
 	assert.True(t, strings.Contains(string(d), l), fmt.Sprintf("License date range is not correct, it should be: %v", l))
diff --git a/use-cases/attachments-with-mailer-helper.md b/use-cases/attachments-with-mailer-helper.md
index 88d0ffeb..a6da7e5c 100644
--- a/use-cases/attachments-with-mailer-helper.md
+++ b/use-cases/attachments-with-mailer-helper.md
@@ -34,7 +34,7 @@ func main() {
   
   // read/attach .txt file
   a_txt := mail.NewAttachment()
-  dat, err := ioutil.ReadFile("testing.txt")
+  dat, err := io.ReadFile("testing.txt")
   if err != nil {
     fmt.Println(err)
   }
@@ -46,7 +46,7 @@ func main() {
   
   // read/attach .pdf file
   a_pdf := mail.NewAttachment()
-  dat, err = ioutil.ReadFile("testing.pdf")
+  dat, err = io.ReadFile("testing.pdf")
   if err != nil {
     fmt.Println(err)
   }
@@ -58,7 +58,7 @@ func main() {
 
   // read/attach inline .jpg file
   a_jpg := mail.NewAttachment()
-  dat, err = ioutil.ReadFile("testing.jpg")
+  dat, err = io.ReadFile("testing.jpg")
   if err != nil {
     fmt.Println(err)
   }