diff --git a/src/main/java/org/tuna/zoopzoop/backend/domain/auth/entity/RefreshToken.java b/src/main/java/org/tuna/zoopzoop/backend/domain/auth/entity/RefreshToken.java
index 414ad42e..b1a8ec8a 100644
--- a/src/main/java/org/tuna/zoopzoop/backend/domain/auth/entity/RefreshToken.java
+++ b/src/main/java/org/tuna/zoopzoop/backend/domain/auth/entity/RefreshToken.java
@@ -21,7 +21,7 @@ public class RefreshToken extends BaseEntity {
     @Column(name = "session_id", unique = true, nullable = false)
     private String sessionId;
 
-    @Column(unique = true, nullable = false)
+    @Column(unique = true, nullable = false, length = 512)
     private String refreshToken;
 
     @Column(name = "created_at", nullable = false, updatable = false)
diff --git a/src/main/java/org/tuna/zoopzoop/backend/global/security/jwt/JwtUtil.java b/src/main/java/org/tuna/zoopzoop/backend/global/security/jwt/JwtUtil.java
index fa5fc4a3..6dbae4e7 100644
--- a/src/main/java/org/tuna/zoopzoop/backend/global/security/jwt/JwtUtil.java
+++ b/src/main/java/org/tuna/zoopzoop/backend/global/security/jwt/JwtUtil.java
@@ -28,12 +28,12 @@ public String generateToken(Member member) {
         String subject = member.getProvider() + ":" + member.getProviderKey();
 
         return Jwts.builder()
-                .setSubject(subject)
+                .subject(subject)
                 .claim("userId", member.getId())
                 .claim("name", member.getName())
-                .setIssuedAt(now)
-                .setExpiration(expiryDate)
-                .signWith(getSigningKey())
+                .issuedAt(now)
+                .expiration(expiryDate)
+                .signWith(getSigningKey(), Jwts.SIG.HS384)
                 .compact();
     }
 
@@ -107,13 +107,13 @@ public String generateRefreshToken(Member member) {
         String subject = member.getProvider() + ":" + member.getProviderKey();
 
         return Jwts.builder()
-                .setSubject(subject)
+                .subject(subject)
                 .claim("userId", member.getId())
                 .claim("name", member.getName())
                 .claim("tokenType", "refresh")
-                .setIssuedAt(now)
-                .setExpiration(expiryDate)
-                .signWith(getSigningKey())
+                .issuedAt(now)
+                .expiration(expiryDate)
+                .signWith(getSigningKey(), Jwts.SIG.HS384)
                 .compact();
     }