diff --git a/lib/get-site-map.ts b/lib/get-site-map.ts
index 984e3dbdb9..59869b3582 100644
--- a/lib/get-site-map.ts
+++ b/lib/get-site-map.ts
@@ -6,8 +6,10 @@ import * as types from './types'
 import { includeNotionIdInUrls } from './config'
 import { getCanonicalPageId } from './get-canonical-page-id'
 import { notion } from './notion-api'
+import ExpiryMap from 'expiry-map'
 
 const uuid = !!includeNotionIdInUrls
+const cache = new ExpiryMap(10000)
 
 export async function getSiteMap(): Promise<types.SiteMap> {
   const partialSiteMap = await getAllPages(
@@ -22,7 +24,8 @@ export async function getSiteMap(): Promise<types.SiteMap> {
 }
 
 const getAllPages = pMemoize(getAllPagesImpl, {
-  cacheKey: (...args) => JSON.stringify(args)
+  cacheKey: (...args) => JSON.stringify(args),
+  cache
 })
 
 async function getAllPagesImpl(