diff --git a/types/event-calendar__core/event-calendar__core-tests.ts b/types/event-calendar__core/event-calendar__core-tests.ts
index 52a93230d5a8a0..0a64deeae7b28c 100644
--- a/types/event-calendar__core/event-calendar__core-tests.ts
+++ b/types/event-calendar__core/event-calendar__core-tests.ts
@@ -271,6 +271,19 @@ cal.setOption("buttonText", () => {
     .setOption("moreLinkContent", (_info: Calendar.MoreLinkInfo) => "content")
     .setOption("noEventsContent", () => "content")
     .setOption("resourceLabelContent", (_info: Calendar.ResourceLabelInfo) => "content")
+    .setOption("resources", [{
+        id: "foo",
+        children: [
+            {
+                id: "bar",
+                children: [
+                    {
+                        id: "baz",
+                    },
+                ],
+            },
+        ],
+    }])
     .setOption("slotLabelFormat", (_t: Date) => "content")
     .setOption("theme", (theme: Calendar.Theme) => {
         let result: Calendar.Theme = {};
diff --git a/types/event-calendar__core/index.d.ts b/types/event-calendar__core/index.d.ts
index 39d5d3d63b509a..982e95882dff48 100644
--- a/types/event-calendar__core/index.d.ts
+++ b/types/event-calendar__core/index.d.ts
@@ -58,6 +58,7 @@ declare namespace Calendar {
         eventBackgroundColor?: string;
         eventTextColor?: string;
         extendedProps?: Record<string, unknown>;
+        children?: ResourceInput[];
     }
 
     interface Resource {
diff --git a/types/event-calendar__core/package.json b/types/event-calendar__core/package.json
index 9d9a0764c43039..c643a88beb8fd0 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": "3.6.9999",
+    "version": "3.7.9999",
     "projects": [
         "https://vkurko.github.io/calendar/"
     ],