diff --git a/build.gradle b/build.gradle
index 7b13745..7b51184 100644
--- a/build.gradle
+++ b/build.gradle
@@ -25,6 +25,7 @@ dependencies {
 	// MySQL
 	implementation 'org.springframework.boot:spring-boot-starter-data-jpa'
 	implementation 'com.mysql:mysql-connector-j'
+	implementation group: 'org.javassist', name: 'javassist', version: '3.15.0-GA'
 
 	// Redis
 	implementation 'org.springframework.boot:spring-boot-starter-data-redis'
diff --git a/src/main/java/com/writon/admin/domain/repository/challenge/EmailRepository.java b/src/main/java/com/writon/admin/domain/repository/challenge/EmailRepository.java
index e91df65..b3079b3 100644
--- a/src/main/java/com/writon/admin/domain/repository/challenge/EmailRepository.java
+++ b/src/main/java/com/writon/admin/domain/repository/challenge/EmailRepository.java
@@ -2,7 +2,6 @@
 
 import com.writon.admin.domain.entity.challenge.Email;
 import java.util.List;
-import java.util.Optional;
 import org.springframework.data.jpa.repository.JpaRepository;
 
 public interface EmailRepository extends JpaRepository<Email, Long> {
diff --git a/src/main/java/com/writon/admin/global/config/WebConfig.java b/src/main/java/com/writon/admin/global/config/WebConfig.java
index 9ded1c2..2914698 100644
--- a/src/main/java/com/writon/admin/global/config/WebConfig.java
+++ b/src/main/java/com/writon/admin/global/config/WebConfig.java
@@ -12,7 +12,7 @@ public class WebConfig implements WebMvcConfigurer {
   @Override
   public void addCorsMappings(CorsRegistry registry) {
     registry.addMapping("/**")
-        .allowedOriginPatterns("http://localhost:3000", "https://www.admin.writon.co.kr")
+        .allowedOriginPatterns("https://www.admin.writon.co.kr")
         .allowedMethods("*")
         .allowedHeaders("*")
         .allowCredentials(true);
diff --git a/src/main/resources/templates/participate_card.html b/src/main/resources/templates/participate_card.html
index 3fb16ba..fe503e2 100644
--- a/src/main/resources/templates/participate_card.html
+++ b/src/main/resources/templates/participate_card.html
@@ -6,7 +6,7 @@
   <tr>
     <td style="text-align: center;">
       <img
-          src="https://writon-data.s3.ap-northeast-2.amazonaws.com/invitation/%EC%B4%88%EB%8C%80%EC%9E%A5+2.0.png"
+          src="https://writon-data2.s3.ap-northeast-2.amazonaws.com/invitation/%EC%B4%88%EB%8C%80%EC%9E%A5+2.0.png"
           alt="Your Image"
           style="display: block; margin: 0 auto; margin-bottom: 16px; width: 500px; height: 500px;">
     </td>
@@ -26,7 +26,7 @@
          target="_blank"
          data-saferedirecturl="[[https://www.google.com/url?q=${link}]]">
         <img
-            src="https://writon-data.s3.ap-northeast-2.amazonaws.com/invitation/%EC%B4%88%EB%8C%80%EC%9E%A5+%EB%B2%84%ED%8A%BC+2.0.png"
+            src="https://writon-data2.s3.ap-northeast-2.amazonaws.com/invitation/%EC%B4%88%EB%8C%80%EC%9E%A5+%EB%B2%84%ED%8A%BC+2.0.png"
             alt="Your Button Image"
             style="display: block; margin: 0 auto; width: 347px; height: 105px;">
       </a>