gem update 에러

fastlane을 업데이트하는데 에러가 발생

$ sudo gem update fastlane Updating installed gems Updating fastlane ERROR:  While executing gem ... (Errno::EPERM)     Operation not permitted - /usr/bin/bin-proxy

stackoverflow에 해결책이 나와있음.

http://stackoverflow.com/questions/32891965/error-while-executing-gem-errnoeperm-operation-not-permitted$#answer-32892222

$ sudo gem install -n /usr/local/bin fastlane Successfully installed fastlane-2.28.8 Parsing documentation for fastlane-2.28.8 unable to convert "\x89" from ASCII-8BIT to UTF-8 for frameit/lib/assets/empty.png, skipping Installing ri documentation for fastlane-2.28.8 1 gem installed