diff --git a/main.go b/main.go
index 81bab01..5e39edc 100644
--- a/main.go
+++ b/main.go
@@ -6,7 +6,6 @@ import (
 	"encoding/pem"
 	"flag"
 	"fmt"
-	"io/ioutil"
 	"os"
 	"path/filepath"
 
@@ -132,7 +131,7 @@ func main() {
 	// only try to load certificate from file if the command line argument was specified
 	if isFlagPassed("cert-file") {
 		// Try to read the file
-		cf, err := ioutil.ReadFile(GetFilePath(*certFile))
+		cf, err := os.ReadFile(GetFilePath(*certFile))
 		if err != nil {
 			output.AuthSuccess = false
 			output.Error = err.Error()