diff --git a/app/src/main/resources/db/migration/V6__increase_member_avatar_value_length.sql b/app/src/main/resources/db/migration/V6__increase_member_avatar_value_length.sql
new file mode 100644
index 0000000..a15f512
--- /dev/null
+++ b/app/src/main/resources/db/migration/V6__increase_member_avatar_value_length.sql
@@ -0,0 +1,3 @@
+-- S3/R2 공개 URL을 저장할 수 있도록 커스텀 아바타 값의 저장 길이를 확장한다.
+ALTER TABLE member
+    ALTER COLUMN avatar_value TYPE character varying(500);
diff --git a/member/src/main/java/com/nalssilog/member/domain/Member.java b/member/src/main/java/com/nalssilog/member/domain/Member.java
index bafadcb..16d002b 100644
--- a/member/src/main/java/com/nalssilog/member/domain/Member.java
+++ b/member/src/main/java/com/nalssilog/member/domain/Member.java
@@ -29,6 +29,7 @@ public class Member extends BaseTimeEntity {
     public static final int NICKNAME_MAX_LENGTH = 10;
     public static final int NICKNAME_MIN_LENGTH = 2;
     public static final int NICKNAME_STORAGE_MAX_LENGTH = 20;
+    public static final int AVATAR_VALUE_MAX_LENGTH = 500;
     /** 허용 문자: 한글(완성형)·영문 대소문자·숫자만. 공백·특수문자 불가. (길이는 @Size 로 별도 검증) */
     public static final String NICKNAME_PATTERN = "^[가-힣a-zA-Z0-9]+$";
 
@@ -52,7 +53,7 @@ public class Member extends BaseTimeEntity {
     @Column(name = "avatar_type", nullable = false, length = 20)
     private AvatarType avatarType;
 
-    @Column(name = "avatar_value", nullable = true, length = 100)
+    @Column(name = "avatar_value", nullable = true, length = AVATAR_VALUE_MAX_LENGTH)
     private String avatarValue;
 
     @Enumerated(EnumType.STRING)