diff --git a/types/event-calendar__core/event-calendar__core-tests.ts b/types/event-calendar__core/event-calendar__core-tests.ts
index 373466a71567d7..ad65aed1c161f4 100644
--- a/types/event-calendar__core/event-calendar__core-tests.ts
+++ b/types/event-calendar__core/event-calendar__core-tests.ts
@@ -140,8 +140,10 @@ cal = createCalendar(target, plugins, {
     customScrollbars: true,
     date: "1997-04-12",
     dateClick: (_info: Calendar.DateClickInfo) => {},
+    dateIncrement: { days: 7 },
     datesAboveResources: false,
     datesSet: (_info: Calendar.DatesSetInfo) => {},
+    dayCellContent: { html: "" },
     dayCellFormat: dateFormat,
     dayHeaderAriaLabelFormat: dateFormat,
     dayHeaderFormat: dateFormat,
@@ -272,6 +274,7 @@ cal.setOption("buttonText", () => {
         return customButtons;
     })
     .setOption("columnWidth", undefined)
+    .setOption("dayCellContent", (_arg: Calendar.DayCellContentArg) => "content")
     .setOption("dayCellFormat", (_d: Date) => "content")
     .setOption("dayHeaderAriaLabelFormat", (_d: Date) => "content")
     .setOption("dayHeaderFormat", (_d: Date) => "content")
@@ -326,6 +329,7 @@ let validResource: Calendar.Resource = {
     title: "content",
     eventBackgroundColor: undefined,
     eventTextColor: undefined,
+    expanded: true,
     extendedProps: { a: 1, b: "two", c: [] },
 };
 const { title, ...rest } = validResource;
diff --git a/types/event-calendar__core/index.d.ts b/types/event-calendar__core/index.d.ts
index 1173ee7324576b..7e1e878267b83a 100644
--- a/types/event-calendar__core/index.d.ts
+++ b/types/event-calendar__core/index.d.ts
@@ -78,6 +78,7 @@ export namespace Calendar {
         title?: Content;
         eventBackgroundColor?: string;
         eventTextColor?: string;
+        expanded?: boolean;
         extendedProps?: Record<string, unknown>;
         children?: ResourceInput[];
     }
@@ -87,6 +88,7 @@ export namespace Calendar {
         title: Content;
         eventBackgroundColor: string | undefined;
         eventTextColor: string | undefined;
+        expanded: boolean;
         extendedProps: Record<string, unknown>;
     }
 
@@ -131,6 +133,13 @@ export namespace Calendar {
         view: View;
     }
 
+    interface DayCellContentArg {
+        allDay: boolean;
+        date: Date;
+        isToday: boolean;
+        resource: Resource;
+    }
+
     interface EventClassNamesInfo {
         event: Event;
         view: View;
@@ -326,8 +335,10 @@ export namespace Calendar {
         customScrollbars?: boolean;
         date?: Date | string | undefined;
         dateClick?: (info: DateClickInfo) => void;
+        dateIncrement?: DurationInput;
         datesAboveResources?: boolean;
         datesSet?: (info: DatesSetInfo) => void;
+        dayCellContent?: Content | ((arg: DayCellContentArg) => Content);
         dayCellFormat?: Intl.DateTimeFormatOptions | ((d: Date) => Content);
         dayHeaderAriaLabelFormat?: Intl.DateTimeFormatOptions | ((d: Date) => Content);
         dayHeaderFormat?: Intl.DateTimeFormatOptions | ((d: Date) => Content);
diff --git a/types/event-calendar__core/package.json b/types/event-calendar__core/package.json
index ec6b13ede7fa2a..37feea24bf37d5 100644
--- a/types/event-calendar__core/package.json
+++ b/types/event-calendar__core/package.json
@@ -2,7 +2,7 @@
     "private": true,
     "type": "module",
     "name": "@types/event-calendar__core",
-    "version": "5.5.9999",
+    "version": "5.6.9999",
     "projects": [
         "https://vkurko.github.io/calendar/"
     ],