iOSを1年ぶりに触ったら下記の通りエラー

pod update
[!] `GoogleAppMeasurement` requires CocoaPods version `>= 1.10.2`, which is not satisfied by your current version, `1.10.1`.

cocoapodsのバージョンをあげる
sudo gem install cocoapods

ERROR: While executing gem … (Gem::FilePermissionError)
You don’t have write permissions for the /usr/bin directory.

一応成功
sudo gem install cocoapods -n /usr/local/bin