diff --git a/main.go b/main.go
index d0cb9dc..7637e32 100644
--- a/main.go
+++ b/main.go
@@ -22,13 +22,19 @@ func main() {
 	if !ok {
 		log.Fatalf("unable to read CONTAINER_NAME")
 	}
+	listen, ok := os.LookupEnv("LISTEN")
+	if !ok {
+		listen = ":8080"
+	}
 
 	defaultHeaders := map[string]string{"User-Agent": "engine-api-cli-1.0"}
-	cli, err := client.NewClient("unix:///var/run/docker.sock", "v1.44", nil, defaultHeaders)
+	cli, err := client.NewClient("unix:///var/run/docker.sock", "v1.40", nil, defaultHeaders)
 	if err != nil {
 		log.Fatalf("unread: %s", err)
 	}
-	logs, err := cli.ContainerLogs(context.TODO(), containerName, types.ContainerLogsOptions{})
+	logs, err := cli.ContainerLogs(context.TODO(), containerName, types.ContainerLogsOptions{
+		ShowStdout: true,
+	})
 	if err != nil {
 		log.Fatalf("unread: %s", err)
 	}
@@ -38,7 +44,7 @@ func main() {
 	go counter.Scan(logs)
 
 	http.HandleFunc("/", counter.MetricsHandler)
-	err = http.ListenAndServe(":8080", nil)
+	err = http.ListenAndServe(listen, nil)
 	log.Fatalf("unable to listen: %s", err)
 }