diff --git a/packages/backend/src/services/user-cache.ts b/packages/backend/src/services/user-cache.ts
index b7919d008..760b2570f 100644
--- a/packages/backend/src/services/user-cache.ts
+++ b/packages/backend/src/services/user-cache.ts
@@ -18,11 +18,11 @@ export const uriPersonCache = new Cache<User>(
 	async (uri) => await Users.findOneBy({ uri, isDeleted: IsNull() }) ?? undefined,
 );
 export const publicKeyCache = new Cache<UserPublickey>(
-	2 * HOUR,
+	15 * MINUTE,
 	(keyId) => UserPublickeys.findOneBy({ keyId }).then(x => x ?? undefined),
 );
 export const publicKeyByUserIdCache = new Cache<UserPublickey>(
-	2 * HOUR,
+	15 * MINUTE,
 	(userId) => UserPublickeys.findOneBy({ userId }).then(x => x ?? undefined),
 );