Error loading stringio for ruby on rails

2025-03-09 ruby rails

After updating a Rails application on the host, all of other Rails applications got the error below:

Error: The application encountered the following error: You have already activated stringio 3.1.5, but your Gemfile requires stringio 3.1.1. Prepending `bundle exec` to your command may solve this. (Gem::LoadError)

Applications are invoked by Phusion Passenger. Looking for the way to isolate each applications environment, or everyhing should be updated at the same time..?