diff --git a/metrics.go b/metrics.go
index 2ddb734..52212e3 100644
--- a/metrics.go
+++ b/metrics.go
@@ -8,6 +8,7 @@ import (
 	"io/ioutil"
 	"log"
 	"net/http"
+	"os"
 	"strconv"
 	"strings"
 	"time"
@@ -32,6 +33,9 @@ type OneMetric struct {
 	DaysUntilDeactivated int // berechneter Wert
 }
 
+// global variables
+var INFLUX_RO_TOKEN = os.Getenv("INFLUX_RO_TOKEN")
+
 // metrics handler
 
 func string2float64(s string) float64 {
@@ -117,7 +121,7 @@ func metricsHandler(response http.ResponseWriter, request *http.Request) {
 		}
 
 		// Set headers
-		req.Header.Set("Authorization", "Token TQvQxxLLAj1kTKWuEqcx7BA-KfE6WtJUeDlPa_Dnvms6Zqf6uh6lMbpXtzcsCjKO_x3PrpxxGDR5E6YnDB5PFg==")
+		req.Header.Set("Authorization", "Token "+INFLUX_RO_TOKEN)
 		req.Header.Set("accept", "application/csv")
 		req.Header.Set("content-type", "application/vnd.flux")
 
@@ -275,7 +279,7 @@ func getLastMetrics(deveui string) OneMetric {
 	}
 
 	// Set headers
-	req.Header.Set("Authorization", "Token TQvQxxLLAj1kTKWuEqcx7BA-KfE6WtJUeDlPa_Dnvms6Zqf6uh6lMbpXtzcsCjKO_x3PrpxxGDR5E6YnDB5PFg==")
+	req.Header.Set("Authorization", "Token "+INFLUX_RO_TOKEN)
 	req.Header.Set("accept", "application/csv")
 	req.Header.Set("content-type", "application/vnd.flux")