diff --git a/build.gradle b/build.gradle
index 770e43e..4f04f41 100644
--- a/build.gradle
+++ b/build.gradle
@@ -1,7 +1,7 @@
 plugins {
 	id 'java'
 	id 'org.springframework.boot' version '3.1.11'
-	id 'io.spring.dependency-management' version '1.1.4'
+	id 'io.spring.dependency-management' version '1.1.6'
 }
 
 group = 'treehouse'
diff --git a/src/main/java/treehouse/server/api/user/presentation/dto/UserRequestDTO.java b/src/main/java/treehouse/server/api/user/presentation/dto/UserRequestDTO.java
index dfde95f..cc3c808 100644
--- a/src/main/java/treehouse/server/api/user/presentation/dto/UserRequestDTO.java
+++ b/src/main/java/treehouse/server/api/user/presentation/dto/UserRequestDTO.java
@@ -14,7 +14,9 @@ public static class checkName {
 
     @Getter
     public static class registerUser {
+        @NotBlank(message = "전화번호를 입력해주세요.")
         private String phoneNumber;
+        @NotBlank(message = "유저이름(고유)을 입력해주세요.")
         private String userName;
     }
 
diff --git a/src/main/java/treehouse/server/global/entity/User/User.java b/src/main/java/treehouse/server/global/entity/User/User.java
index 66c8d16..1e9bb7b 100644
--- a/src/main/java/treehouse/server/global/entity/User/User.java
+++ b/src/main/java/treehouse/server/global/entity/User/User.java
@@ -47,6 +47,8 @@ public class User extends BaseDateTimeEntity {
     private Integer activeRate = 0; //활동량
     @Builder.Default
     private Integer invitationCount = 3; //남아있는 초대장의 개수
+    @Builder.Default
+    private Integer invitationCreatedCount = 0; //초대장 생성 횟수
 
 
     // 탈퇴일자 필요한지 확인하기
@@ -76,5 +78,15 @@ public boolean updatePushAgree(boolean pushAgree){
 
     public void reduceInvitationCount() {
         this.invitationCount--;
+        this.invitationCreatedCount++; // 초대장 생성 횟수 증가
+        checkAndIncreaseInvitationCount(); // 3회마다 invitationCount 증가
+    }
+
+    // 초대 횟수가 3번째일 때만 invitationCount 1 증가
+    private void checkAndIncreaseInvitationCount() {
+        if (this.invitationCreatedCount == 3) {
+            this.invitationCount++;  // 3번째일 때만 증가
+            this.invitationCreatedCount = 0; // 카운트 초기화
+        }
     }
 }
\ No newline at end of file