diff --git a/package.json b/package.json
index 68ef655e..20df6dcc 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
 	"name": "atomic-calendar-revive",
-	"version": "9.0.1",
+	"version": "9.0.2-beta.1",
 	"description": "Calendar Card for Home Assistant",
 	"main": "atomic-calendar-revive.js",
 	"scripts": {
diff --git a/src/lib/eventMode.html.ts b/src/lib/eventMode.html.ts
index 4e04be40..ce9631f3 100644
--- a/src/lib/eventMode.html.ts
+++ b/src/lib/eventMode.html.ts
@@ -145,11 +145,11 @@ export function getLocationHTML(config: atomicCardConfig, event: EventClass) {
  */
 export function getWeekNumberHTML(day: [EventClass], currentWeek: number) {
     let currentWeekHTML = html``
-    if (currentWeek != day[0].startDateTime.week()) {
+    if (currentWeek != day[0].startDateTime.isoWeek()) {
         if (day[0].startDateTime.isBefore(dayjs())) {
-            currentWeek = dayjs().week()
+            currentWeek = dayjs().isoWeek()
         } else {
-            currentWeek = day[0].startDateTime.week();
+            currentWeek = day[0].startDateTime.isoWeek();
         }
 
         currentWeekHTML = html`<div class="week-number">${localize('ui.common.week')} ${currentWeek.toString()}</div>`