diff --git a/Firebase/functions/package-lock.json b/Firebase/functions/package-lock.json
index 93e60a66..5f839b66 100644
--- a/Firebase/functions/package-lock.json
+++ b/Firebase/functions/package-lock.json
@@ -10,7 +10,7 @@
         "axios": "^1.9.0",
         "dotenv": "^16.5.0",
         "firebase-admin": "^12.6.0",
-        "firebase-functions": "^7.0.5",
+        "firebase-functions": "^7.2.2",
         "jsonwebtoken": "^9.0.2"
       },
       "devDependencies": {
@@ -3145,9 +3145,9 @@
       "license": "MIT"
     },
     "node_modules/firebase-functions": {
-      "version": "7.0.5",
-      "resolved": "https://registry.npmjs.org/firebase-functions/-/firebase-functions-7.0.5.tgz",
-      "integrity": "sha512-uG2dR5AObLuUrWWjj/de5XxNHCVi+Ehths0DSRcLjHJdgw1TSejwoZZ5na6gVrl3znNjRdBRy5Br5UlhaIU3Ww==",
+      "version": "7.2.2",
+      "resolved": "https://registry.npmjs.org/firebase-functions/-/firebase-functions-7.2.2.tgz",
+      "integrity": "sha512-fWFVI+4weuaat+Fp+4xYY1T+omiTvya8fW79+edgLWCOaDEBSBNlfhstnt+K1esblscZlJf8v+IA0LsCG8Uf1Q==",
       "license": "MIT",
       "dependencies": {
         "@types/cors": "^2.8.5",
diff --git a/Firebase/functions/package.json b/Firebase/functions/package.json
index f6930575..f5fe7f8e 100644
--- a/Firebase/functions/package.json
+++ b/Firebase/functions/package.json
@@ -18,7 +18,7 @@
     "axios": "^1.9.0",
     "dotenv": "^16.5.0",
     "firebase-admin": "^12.6.0",
-    "firebase-functions": "^7.0.5",
+    "firebase-functions": "^7.2.2",
     "jsonwebtoken": "^9.0.2"
   },
   "devDependencies": {
diff --git a/Firebase/functions/src/auth/apple.ts b/Firebase/functions/src/auth/apple.ts
index 3e9dc953..132e05e5 100644
--- a/Firebase/functions/src/auth/apple.ts
+++ b/Firebase/functions/src/auth/apple.ts
@@ -54,7 +54,7 @@ function getAppleConfiguration() {
 
 export const requestAppleCustomToken = onCall({
     cors: true,
-    maxInstances: 10,
+    maxInstances: 3,
     region: "asia-northeast3",
 }, async (request) => {
     try {
@@ -142,7 +142,7 @@ export const requestAppleCustomToken = onCall({
 
 export const requestAppleRefreshToken = onCall({
     cors: true,
-    maxInstances: 10,
+    maxInstances: 3,
     region: "asia-northeast3",
   }, async (request) => {
     if (!request.auth) {
@@ -186,7 +186,7 @@ export const requestAppleRefreshToken = onCall({
   
 export const refreshAppleAccessToken = onCall({
     cors: true,
-    maxInstances: 10,
+    maxInstances: 3,
     region: "asia-northeast3",
 }, async (request) => {
   // 인증 확인
@@ -267,7 +267,7 @@ export const refreshAppleAccessToken = onCall({
   
 export const revokeAppleAccessToken = onCall({
     cors: true,
-    maxInstances: 10,
+    maxInstances: 3,
     region: "asia-northeast3",
 }, async (request) => {
       // 인증 확인
diff --git a/Firebase/functions/src/auth/github.ts b/Firebase/functions/src/auth/github.ts
index 19a0391f..d1fc7b05 100644
--- a/Firebase/functions/src/auth/github.ts
+++ b/Firebase/functions/src/auth/github.ts
@@ -5,7 +5,7 @@ import axios from "axios";
 // GitHub OAuth 인증 및 커스텀 토큰 발급 함수
 export const requestGithubTokens = onCall({
     cors: true,
-    maxInstances: 10,
+    maxInstances: 3,
     region: "asia-northeast3",
 }, async (request) => {
     try {
@@ -103,7 +103,7 @@ export const requestGithubTokens = onCall({
 
 export const revokeGithubAccessToken = onCall({
         cors: true,
-        maxInstances: 10,
+        maxInstances: 3,
         region: "asia-northeast3",
     }, async (request) => {
         try {
diff --git a/Firebase/functions/src/fcm/notification.ts b/Firebase/functions/src/fcm/notification.ts
index 279da8ac..b51d01ef 100644
--- a/Firebase/functions/src/fcm/notification.ts
+++ b/Firebase/functions/src/fcm/notification.ts
@@ -18,6 +18,7 @@ type FirestoreErrorLike = {
 
 // Cloud Tasks에 의해 트리거되는 함수
 export const sendPushNotification = onTaskDispatched({
+        maxInstances: 2,
         region: "asia-northeast3",
         retryConfig: { maxAttempts: 3, minBackoffSeconds: 5 },
         rateLimits: { maxDispatchesPerSecond: 200 },
diff --git a/Firebase/functions/src/fcm/schedule.ts b/Firebase/functions/src/fcm/schedule.ts
index 72945c9b..1ce79c00 100644
--- a/Firebase/functions/src/fcm/schedule.ts
+++ b/Firebase/functions/src/fcm/schedule.ts
@@ -25,6 +25,7 @@ type ErrorLike = {
 };
 
 export const scheduleTodoReminder = onSchedule({
+        maxInstances: 1,
         region: LOCATION,
         schedule: "*/5 * * * *",
         timeZone: "UTC"
diff --git a/Firebase/functions/src/notification/deletion.ts b/Firebase/functions/src/notification/deletion.ts
index 13a6620e..95b1f66e 100644
--- a/Firebase/functions/src/notification/deletion.ts
+++ b/Firebase/functions/src/notification/deletion.ts
@@ -16,7 +16,7 @@ type NotificationDeletionTaskData = {
 
 export const requestPushNotificationDeletion = onCall({
         cors: true,
-        maxInstances: 10,
+        maxInstances: 3,
         region: LOCATION,
     },
     async (request) => {
@@ -94,7 +94,7 @@ export const requestPushNotificationDeletion = onCall({
 
 export const undoPushNotificationDeletion = onCall({
         cors: true,
-        maxInstances: 10,
+        maxInstances: 3,
         region: LOCATION,
     },
     async (request) => {
@@ -147,6 +147,7 @@ export const undoPushNotificationDeletion = onCall({
 );
 
 export const completePushNotificationDeletion = onTaskDispatched({
+        maxInstances: 1,
         region: LOCATION,
         retryConfig: {maxAttempts: 3, minBackoffSeconds: 5},
         rateLimits: {maxDispatchesPerSecond: 200},
diff --git a/Firebase/functions/src/todo/cleanup.ts b/Firebase/functions/src/todo/cleanup.ts
index 881a0173..fcc1031c 100644
--- a/Firebase/functions/src/todo/cleanup.ts
+++ b/Firebase/functions/src/todo/cleanup.ts
@@ -8,6 +8,7 @@ const DELETE_BATCH_SIZE = 200;
 const QUERY_BATCH_SIZE = 100;
 
 export const removeTodoNotificationDocuments = onDocumentDeleted({
+        maxInstances: 1,
         document: "users/{userId}/todoLists/{todoId}",
         region: LOCATION
     },
@@ -29,6 +30,7 @@ export const removeTodoNotificationDocuments = onDocumentDeleted({
 );
 
 export const removeCompletedTodoNotificationRecords = onDocumentUpdated({
+        maxInstances: 1,
         document: "users/{userId}/todoLists/{todoId}",
         region: LOCATION
     },
@@ -64,6 +66,7 @@ export const removeCompletedTodoNotificationRecords = onDocumentUpdated({
 );
 
 export const cleanupUnusedTodoNotificationRecords = onSchedule({
+        maxInstances: 1,
         region: LOCATION,
         schedule: "0 * * * *",
         timeZone: "UTC"
diff --git a/Firebase/functions/src/todo/deletion.ts b/Firebase/functions/src/todo/deletion.ts
index 2490a0a7..b62cf491 100644
--- a/Firebase/functions/src/todo/deletion.ts
+++ b/Firebase/functions/src/todo/deletion.ts
@@ -17,7 +17,7 @@ type TodoDeletionTaskData = {
 
 export const requestTodoDeletion = onCall({
         cors: true,
-        maxInstances: 10,
+        maxInstances: 3,
         region: LOCATION,
     },
     async (request) => {
@@ -105,7 +105,7 @@ export const requestTodoDeletion = onCall({
 
 export const undoTodoDeletion = onCall({
         cors: true,
-        maxInstances: 10,
+        maxInstances: 3,
         region: LOCATION,
     },
     async (request) => {
@@ -163,6 +163,7 @@ export const undoTodoDeletion = onCall({
 );
 
 export const completeTodoDeletion = onTaskDispatched({
+        maxInstances: 1,
         region: LOCATION,
         retryConfig: {maxAttempts: 3, minBackoffSeconds: 5},
         rateLimits: {maxDispatchesPerSecond: 200},
diff --git a/Firebase/functions/src/todo/update.ts b/Firebase/functions/src/todo/update.ts
index 930869be..d08996ea 100644
--- a/Firebase/functions/src/todo/update.ts
+++ b/Firebase/functions/src/todo/update.ts
@@ -7,6 +7,7 @@ const LOCATION = "asia-northeast3";
 const BATCH_SIZE = 200;
 
 export const syncTodoNotificationCategory = onDocumentUpdated({
+        maxInstances: 1,
         document: "users/{userId}/todoLists/{todoId}",
         region: LOCATION
     },
diff --git a/Firebase/functions/src/todoCategory/update.ts b/Firebase/functions/src/todoCategory/update.ts
index 1aee0eb6..2052c6d1 100644
--- a/Firebase/functions/src/todoCategory/update.ts
+++ b/Firebase/functions/src/todoCategory/update.ts
@@ -21,6 +21,7 @@ type TodoCategoryUpdateTaskData = {
 };
 
 export const requestMoveRemovedCategoryTodosToEtc = onDocumentUpdated({
+        maxInstances: 1,
         document: "users/{userId}/userData/categories",
         region: LOCATION
     },
@@ -80,6 +81,7 @@ export const requestMoveRemovedCategoryTodosToEtc = onDocumentUpdated({
 );
 
 export const completeMoveRemovedCategoryTodosToEtc = onTaskDispatched({
+        maxInstances: 1,
         region: LOCATION,
         retryConfig: { maxAttempts: 3, minBackoffSeconds: 5 },
         rateLimits: { maxDispatchesPerSecond: 20 },
diff --git a/Firebase/functions/src/user/delete.ts b/Firebase/functions/src/user/delete.ts
index 006085a4..8cfa69d4 100644
--- a/Firebase/functions/src/user/delete.ts
+++ b/Firebase/functions/src/user/delete.ts
@@ -3,6 +3,9 @@ import * as admin from "firebase-admin";
 import * as logger from "firebase-functions/logger";
 
 export const cleanupDeletedUserFirestoreData = functions
+    .runWith({
+        maxInstances: 1
+    })
     .region("asia-northeast3")
     .auth
     .user()
diff --git a/Firebase/functions/src/webPage/deletion.ts b/Firebase/functions/src/webPage/deletion.ts
index 52145449..76470ecc 100644
--- a/Firebase/functions/src/webPage/deletion.ts
+++ b/Firebase/functions/src/webPage/deletion.ts
@@ -17,7 +17,7 @@ type WebPageDeletionTaskData = {
 
 export const requestWebPageDeletion = onCall({
         cors: true,
-        maxInstances: 10,
+        maxInstances: 3,
         region: LOCATION,
     },
     async (request) => {
@@ -101,7 +101,7 @@ export const requestWebPageDeletion = onCall({
 
 export const undoWebPageDeletion = onCall({
         cors: true,
-        maxInstances: 10,
+        maxInstances: 3,
         region: LOCATION,
     },
     async (request) => {
@@ -163,6 +163,7 @@ export const undoWebPageDeletion = onCall({
 );
 
 export const completeWebPageDeletion = onTaskDispatched({
+        maxInstances: 1,
         region: LOCATION,
         retryConfig: { maxAttempts: 3, minBackoffSeconds: 5 },
         rateLimits: { maxDispatchesPerSecond: 200 },