diff --git a/BE/src/auth/dto/rename-user.dto.ts b/BE/src/auth/dto/rename-user.dto.ts
new file mode 100644
index 00000000..fe809699
--- /dev/null
+++ b/BE/src/auth/dto/rename-user.dto.ts
@@ -0,0 +1,6 @@
+import { ApiProperty } from '@nestjs/swagger';
+
+export class RenameUserDto {
+  @ApiProperty({ description: '변경할 닉네임' })
+  nickname: string;
+}
diff --git a/BE/src/auth/user.controller.ts b/BE/src/auth/user.controller.ts
index 881a2b7c..1476f727 100644
--- a/BE/src/auth/user.controller.ts
+++ b/BE/src/auth/user.controller.ts
@@ -1,7 +1,8 @@
-import { Controller, Get, Req, UseGuards } from '@nestjs/common';
+import { Body, Controller, Get, Patch, Req, UseGuards } from '@nestjs/common';
 import { Request } from 'express';
 import {
   ApiBearerAuth,
+  ApiBody,
   ApiOperation,
   ApiResponse,
   ApiTags,
@@ -9,6 +10,7 @@ import {
 import { UserService } from './user.service';
 import { JwtAuthGuard } from './jwt-auth-guard';
 import { ProfileResponseDto } from './dto/profile-response.dto';
+import { RenameUserDto } from './dto/rename-user.dto';
 
 @Controller('/api/user')
 @ApiTags('프로필 API')
@@ -27,4 +29,20 @@ export class UserController {
   getProfile(@Req() request: Request) {
     return this.userService.getProfile(parseInt(request.user.userId, 10));
   }
+
+  @Patch('/rename')
+  @UseGuards(JwtAuthGuard)
+  @ApiOperation({
+    summary: '유저 닉네임 변경 API',
+  })
+  @ApiBody({
+    type: RenameUserDto,
+  })
+  @ApiBearerAuth()
+  renameUser(@Req() request: Request, @Body() body: RenameUserDto) {
+    const userId = parseInt(request.user.userId, 10);
+    const newName = body.nickname;
+
+    return this.userService.renameUser(userId, newName);
+  }
 }
diff --git a/BE/src/auth/user.repository.ts b/BE/src/auth/user.repository.ts
index 4259adc1..1b37c53b 100644
--- a/BE/src/auth/user.repository.ts
+++ b/BE/src/auth/user.repository.ts
@@ -26,6 +26,10 @@ export class UserRepository extends Repository<User> {
       const hashedPassword: string = await bcrypt.hash(password, salt);
       const user = this.create({ email, password: hashedPassword });
       await queryRunner.manager.save(user);
+
+      user.nickname = `익명의 투자자${user.id}`;
+      await queryRunner.manager.save(user);
+
       const asset = this.assetRepository.create({ user_id: user.id });
       await queryRunner.manager.save(asset);
 
@@ -52,6 +56,10 @@ export class UserRepository extends Repository<User> {
         password: hashedPassword,
       });
       await this.save(user);
+
+      user.nickname = `익명의 투자자${user.id}`;
+      await queryRunner.manager.save(user);
+
       const asset = this.assetRepository.create({ user_id: user.id });
       await queryRunner.manager.save(asset);
 
diff --git a/BE/src/auth/user.service.ts b/BE/src/auth/user.service.ts
index fe860a50..dd9df95c 100644
--- a/BE/src/auth/user.service.ts
+++ b/BE/src/auth/user.service.ts
@@ -1,4 +1,8 @@
-import { Injectable } from '@nestjs/common';
+import {
+  BadRequestException,
+  Injectable,
+  NotFoundException,
+} from '@nestjs/common';
 import { UserRepository } from './user.repository';
 import { ProfileResponseDto } from './dto/profile-response.dto';
 
@@ -10,4 +14,36 @@ export class UserService {
     const user = await this.userRepository.findOneBy({ id: userId });
     return new ProfileResponseDto(user.nickname, user.email);
   }
+
+  async renameUser(userId: number, newName: string) {
+    const user = await this.userRepository.findOneBy({ id: userId });
+    if (!user) {
+      throw new NotFoundException('존재하지 않는 유저입니다.');
+    }
+
+    this.validateName(newName);
+    await this.checkNameDuplicate(newName);
+
+    return this.userRepository.update({ id: userId }, { nickname: newName });
+  }
+
+  private validateName(nickname: string) {
+    const regex = /^[가-힣a-zA-Z0-9]+$/;
+    if (!regex.test(nickname)) {
+      throw new BadRequestException('한글, 영문, 숫자만 사용 가능합니다.');
+    }
+
+    if (nickname.includes('익명의투자자')) {
+      throw new BadRequestException('사용 불가능한 단어가 포함되어 있습니다.');
+    }
+  }
+
+  private async checkNameDuplicate(nickname: string) {
+    const isDuplicated = await this.userRepository.existsBy({
+      nickname,
+    });
+    if (isDuplicated) {
+      throw new BadRequestException('이미 존재하는 닉네임입니다.');
+    }
+  }
 }
diff --git a/BE/src/ranking/ranking.service.ts b/BE/src/ranking/ranking.service.ts
index b5782877..b7559f8f 100644
--- a/BE/src/ranking/ranking.service.ts
+++ b/BE/src/ranking/ranking.service.ts
@@ -104,7 +104,7 @@ export class RankingService {
     };
   }
 
-  @Cron('*/1 * * * 1-5')
+  @Cron('0 16 * * 1-5')
   async updateRanking() {
     const [profitRateRanking, assetRanking] = await Promise.all([
       this.calculateRanking(SortType.PROFIT_RATE),
diff --git a/BE/src/stockSocket/stock-execute-order.repository.ts b/BE/src/stockSocket/stock-execute-order.repository.ts
index af60a937..1c14ec80 100644
--- a/BE/src/stockSocket/stock-execute-order.repository.ts
+++ b/BE/src/stockSocket/stock-execute-order.repository.ts
@@ -29,7 +29,7 @@ export class StockExecuteOrderRepository extends Repository<Order> {
 
   async checkExecutableOrder(stockCode, value) {
     const queryRunner = this.dataSource.createQueryRunner();
-    await queryRunner.startTransaction();
+    await queryRunner.startTransaction('SERIALIZABLE');
 
     try {
       const buyOrders = await queryRunner.manager.find(Order, {
diff --git a/FE/src/utils/chart/drawUpperYAxis.ts b/FE/src/utils/chart/drawUpperYAxis.ts
index 1542cff3..769a7e0f 100644
--- a/FE/src/utils/chart/drawUpperYAxis.ts
+++ b/FE/src/utils/chart/drawUpperYAxis.ts
@@ -16,6 +16,7 @@ export const drawUpperYAxis = (
 ) => {
   const values = data
     .map((d) => {
+
       if (d.mov_avg_20 && d.mov_avg_5) {
         return [
           +d.stck_hgpr,
@@ -25,6 +26,7 @@ export const drawUpperYAxis = (
           Math.floor(+d.mov_avg_5),
           Math.floor(+d.mov_avg_20),
         ];
+
       } else if (d.mov_avg_5) {
         return [
           +d.stck_hgpr,
@@ -33,6 +35,7 @@ export const drawUpperYAxis = (
           +d.stck_oprc,
           Math.floor(+d.mov_avg_5),
         ];
+
       } else if (d.mov_avg_20) {
         return [
           +d.stck_hgpr,