diff --git a/server/src/validation/notificationValidation.ts b/server/src/validation/notificationValidation.ts
index 7e1491a9b..2f261d823 100644
--- a/server/src/validation/notificationValidation.ts
+++ b/server/src/validation/notificationValidation.ts
@@ -101,8 +101,8 @@ export const sendTestEmailBodyValidation = z.object({
 
 export const updateNotificationsValidation = z
 	.object({
-		monitorIds: z.array(z.string()).min(1, "At least one monitor ID is required"),
-		notificationIds: z.array(z.string()),
+		monitorIds: z.array(z.string()).min(1, "At least one monitor ID is required").max(100, "Cannot update more than 100 monitors at once"),
+		notificationIds: z.array(z.string()).max(100, "Cannot specify more than 100 notification IDs at once"),
 		action: z.enum(["add", "remove", "set"] as const),
 	})
 	.refine(