How do I keep all gems in Gemfile compatible after an updateMy question has already been asked here, but I am trying to understand the reasons behind it as opposed to how to work around it. The error I got was; You have already activated rspec-core 2.7.1, but your Gemfile requires rspec-core 2.6.4. Using bundle exec may solve this. (Gem::LoadError) Now I have been given various solutions like using "mpapis-bundler", or to create a shorthand for "bundle exe
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