diff --git a/src/main/webapp/js/mpData.js b/src/main/webapp/js/mpData.js
index 9a7acc1..625cb30 100644
--- a/src/main/webapp/js/mpData.js
+++ b/src/main/webapp/js/mpData.js
@@ -13,11 +13,11 @@ function displayMetrics() {
 }
 
 function getSystemMetrics() {
-    var url = "https://olproperties-dev.allarddcs.nl/metrics";
-    var req = new XMLHttpRequest();
+    const url = "https://olproperties-dev.allarddcs.nl/metrics";
+    const req = new XMLHttpRequest();
 
-    var metricToDisplay = {};
-    var SRgetPropertiesTime = "io_openliberty_sample_system_SystemResource_getPropertiesTime";
+    const metricToDisplay = {};
+    const SRgetPropertiesTime = "io_openliberty_sample_system_SystemResource_getPropertiesTime";
     metricToDisplay["getProperties_total{mp_scope=\"application\",}"] = "Request Count";
     metricToDisplay[SRgetPropertiesTime + "_seconds{mp_scope=\"application\",quantile=\"0.999\",}"] = "Request Time (ms) at Quantile 0.999";
     metricToDisplay[SRgetPropertiesTime + "_seconds{mp_scope=\"application\",quantile=\"0.5\",}"] = "Request Time (ms) at Quantile 0.5";