diff --git a/backend/src/graphql/resolver/UserResolver.ts b/backend/src/graphql/resolver/UserResolver.ts
index 68a61cbeb..09e8d1079 100644
--- a/backend/src/graphql/resolver/UserResolver.ts
+++ b/backend/src/graphql/resolver/UserResolver.ts
@@ -64,7 +64,7 @@ export class UserResolver {
       userEntity.email = user.email
       userEntity.pubkey = Buffer.from(fromHex(user.pubkey))
 
-      userEntity.save().catch(() => {
+      userRepository.save(userEntity).catch(() => {
         throw new Error('error by save userEntity')
       })
     })
@@ -247,7 +247,7 @@ export class UserResolver {
         userEntityChanged = true
       }
       if (userEntityChanged) {
-        userEntity.save().catch((error) => {
+        userRepository.save(userEntity).catch((error) => {
           throw new Error(error)
         })
       }