diff --git a/Makefile b/Makefile
new file mode 100644
index 0000000..cbf18f0
--- /dev/null
+++ b/Makefile
@@ -0,0 +1,5 @@
+fmt:
+	go fmt ./...
+
+lint:
+	golangci-lint run
diff --git a/fastmirror.go b/fastmirror.go
index f27284c..793ade0 100644
--- a/fastmirror.go
+++ b/fastmirror.go
@@ -7,7 +7,6 @@ import (
 	"github.com/schollz/progressbar/v3"
 	"html/template"
 	"io"
-	"io/ioutil"
 	"log"
 	"net/http"
 	"os"
@@ -126,7 +125,7 @@ func findSourcesFilePath() (string, error) {
 		log.Printf("Found Ubuntu sources file: %s", sourcesListPath)
 		return sourcesListPath, nil
 	}
-	files, err := ioutil.ReadDir(sourcesListDPath)
+	files, err := os.ReadDir(sourcesListDPath)
 	if err != nil {
 		return "", fmt.Errorf("failed to read directory %s: %v", sourcesListDPath, err)
 	}
@@ -146,7 +145,7 @@ func findSourcesFilePath() (string, error) {
 }
 
 func isUbuntuSourcesFile(filePath string) bool {
-	content, err := ioutil.ReadFile(filePath)
+	content, err := os.ReadFile(filePath)
 	if err != nil {
 		log.Printf("Failed to read file %s: %v", filePath, err)
 		return false
@@ -213,7 +212,9 @@ func findFastestMirror() (string, time.Duration, []time.Duration, error) {
 	bar := progressbar.Default(int64(len(mirrors)))
 
 	for _, mirror := range mirrors {
-		bar.Add(1)
+		if err := bar.Add(1); err != nil {
+			log.Printf("Error updating progress bar: %v", err)
+		}
 		if strings.HasPrefix(mirror, "https://") {
 			mirror = strings.TrimSuffix(mirror, "/")
 			startTime := time.Now()
@@ -256,23 +257,44 @@ func isValidMirror(httpClient http.Client, mirrorURL, codename string) bool {
 }
 
 func extractSuites(filePath string) ([]string, error) {
-	content, err := ioutil.ReadFile(filePath)
+	content, err := os.ReadFile(filePath)
 	if err != nil {
 		return nil, fmt.Errorf("failed to read file %s: %v", filePath, err)
 	}
 
-	// Extract suites from the sources file
 	var suites []string
 	scanner := bufio.NewScanner(strings.NewReader(string(content)))
+
+	isModernFormat := false
 	for scanner.Scan() {
 		line := scanner.Text()
-		if strings.HasPrefix(line, "deb ") || strings.HasPrefix(line, "deb-src ") {
-			parts := strings.Fields(line)
-			if len(parts) >= 4 {
-				suites = append(suites, parts[3:]...)
+		if strings.HasPrefix(line, "Types:") {
+			isModernFormat = true
+			break
+		}
+	}
+
+	scanner = bufio.NewScanner(strings.NewReader(string(content)))
+	if isModernFormat {
+		for scanner.Scan() {
+			line := scanner.Text()
+			if strings.HasPrefix(line, "Suites:") {
+				parts := strings.Fields(line)
+				suites = append(suites, parts[1:]...)
+			}
+		}
+	} else {
+		for scanner.Scan() {
+			line := scanner.Text()
+			if strings.HasPrefix(line, "deb ") || strings.HasPrefix(line, "deb-src ") {
+				parts := strings.Fields(line)
+				if len(parts) >= 4 {
+					suites = append(suites, parts[3])
+				}
 			}
 		}
 	}
+
 	if err := scanner.Err(); err != nil {
 		return nil, fmt.Errorf("failed to scan file %s: %v", filePath, err)
 	}
@@ -354,7 +376,7 @@ func updateSourcesFile(filePath, mirrorURL string, suites []string) error {
 		content = buf.String()
 	}
 
-	err = ioutil.WriteFile(filePath, []byte(content), 0644)
+	err = os.WriteFile(filePath, []byte(content), 0644)
 	if err != nil {
 		return fmt.Errorf("failed to update sources file %s: %v", filePath, err)
 	}