npm ERR! code ERESOLVE npm ERR! ERESOLVE unable to resolve dependency tree

$ npm i --save @nestjs/microservices
npm ERR! code ERESOLVE
npm ERR! ERESOLVE unable to resolve dependency tree
npm ERR! 
npm ERR! While resolving: x-app@0.0.1
npm ERR! Found: @nestjs/common@8.4.6
npm ERR! node_modules/@nestjs/common
npm ERR!   @nestjs/common@"^8.0.0" from the root project
npm ERR!   peer @nestjs/common@"^8.0.0" from @nestjs/microservices@8.4.6
npm ERR!   node_modules/@nestjs/microservices
npm ERR!     @nestjs/microservices@"*" from the root project
npm ERR! 
npm ERR! Could not resolve dependency:
npm ERR! peer @nestjs/common@"^7.0.0" from @nestjs/core@7.6.18
npm ERR! node_modules/@nestjs/core
npm ERR!   @nestjs/core@"^7.5.5" from the root project
npm ERR! 
npm ERR! Fix the upstream dependency conflict, or retry
npm ERR! this command with --force, or --legacy-peer-deps
npm ERR! to accept an incorrect (and potentially broken) dependency resolution.

에러 발생시

$ npm install -g @nestjs/cli npm-check-updates
$ nest update --force

$ npm-check-updates "/@nestjs*/" -u
$ npm-check-updates "/nestjs*/" -u    
$ npm install