diff --git a/lib/external-resources/resource.js b/lib/external-resources/resource.js
index 4b5d8dd..c61f70b 100644
--- a/lib/external-resources/resource.js
+++ b/lib/external-resources/resource.js
@@ -4,6 +4,8 @@ import path from "node:path";
 import stream from "node:stream";
 import tar from "#lib/tar";
 
+const DEFAULT_CHECK_TIMEOUT = 1000 * 60 * 60; // 1 hour
+
 export default class ExternalResource extends Events {
     #id;
     #location;
@@ -68,6 +70,14 @@ export default class ExternalResource extends Events {
         return this.#index?.meta;
     }
 
+    get lastChecked () {
+        return this.#index.lastChecked;
+    }
+
+    get lastUpdated () {
+        return this.#index.lastUpdated;
+    }
+
     // public
     async check ( { remote = false, forceRemote } = {} ) {
         const res = await this.update( {
@@ -97,6 +107,9 @@ export default class ExternalResource extends Events {
         // resource is expired
         if ( this.isExpired ) remote = true;
 
+        // last checked interval
+        if ( this.lastChecked && this.lastChecked + DEFAULT_CHECK_TIMEOUT < Date.now() ) remote = true;
+
         // resource exists
         if ( isInstalled && !remote ) return result( 304 );