diff --git a/docs/api/virtual-item.md b/docs/api/virtual-item.md
index 9ab47448..2393788b 100644
--- a/docs/api/virtual-item.md
+++ b/docs/api/virtual-item.md
@@ -6,7 +6,7 @@ The `VirtualItem` object represents a single item returned by the virtualizer. I
 
 ```tsx
 export interface VirtualItem {
-  key: string | number
+  key: string | number | bigint
   index: number
   start: number
   end: number
@@ -19,7 +19,7 @@ The following properties and methods are available on each VirtualItem object:
 ### `key`
 
 ```tsx
-key: string | number
+key: string | number | bigint
 ```
 
 The unique key for the item. By default this is the item index, but should be configured via the `getItemKey` Virtualizer option.
diff --git a/packages/virtual-core/src/index.ts b/packages/virtual-core/src/index.ts
index 951a33db..99d38478 100644
--- a/packages/virtual-core/src/index.ts
+++ b/packages/virtual-core/src/index.ts
@@ -26,7 +26,7 @@ export interface Range {
   count: number
 }
 
-type Key = number | string
+type Key = number | string | bigint
 
 export interface VirtualItem {
   key: Key