diff --git a/src/Utils/auth-utils.ts b/src/Utils/auth-utils.ts
index 0b29d82..006eb8d 100644
--- a/src/Utils/auth-utils.ts
+++ b/src/Utils/auth-utils.ts
@@ -20,6 +20,7 @@ export function makeCacheableSignalKeyStore(
 	const cache = _cache || new NodeCache({
 		stdTTL: DEFAULT_CACHE_TTLS.SIGNAL_STORE, // 5 minutes
 		useClones: false,
+		deleteOnExpire: true,
 	})
 
 	function getUniqueId(type: string, id: string) {