diff --git a/backend/internal/user/repo/user.go b/backend/internal/user/repo/user.go
index 908c0db..29d831d 100644
--- a/backend/internal/user/repo/user.go
+++ b/backend/internal/user/repo/user.go
@@ -347,9 +347,23 @@ func (r *UserRepo) OAuthLogin(ctx context.Context, platform consts.UserPlatform,
 	if err != nil {
 		return nil, errcode.ErrNotInvited.Wrap(err)
 	}
+	if ui.AvatarURL != req.AvatarURL {
+		if err = entx.WithTx(ctx, r.db, func(tx *db.Tx) error {
+			return r.updateAvatar(ctx, tx, ui, req.AvatarURL)
+		}); err != nil {
+			return nil, err
+		}
+	}
 	return ui.Edges.User, nil
 }
 
+func (r *UserRepo) updateAvatar(ctx context.Context, tx *db.Tx, ui *db.UserIdentity, avatar string) error {
+	if err := tx.UserIdentity.UpdateOneID(ui.ID).SetAvatarURL(avatar).Exec(ctx); err != nil {
+		return err
+	}
+	return tx.User.UpdateOneID(ui.UserID).SetAvatarURL(avatar).Exec(ctx)
+}
+
 func (r *UserRepo) SignUpOrIn(ctx context.Context, platform consts.UserPlatform, req *domain.OAuthUserInfo) (*db.User, error) {
 	var u *db.User
 	err := entx.WithTx(ctx, r.db, func(tx *db.Tx) error {
@@ -359,6 +373,11 @@ func (r *UserRepo) SignUpOrIn(ctx context.Context, platform consts.UserPlatform,
 			First(ctx)
 		if err == nil {
 			u = ui.Edges.User
+			if ui.AvatarURL != req.AvatarURL {
+				if err = r.updateAvatar(ctx, tx, ui, req.AvatarURL); err != nil {
+					return err
+				}
+			}
 			return nil
 		}
 		if !db.IsNotFound(err) {