Gemfile in sentry-raven-3.0.0 vs Gemfile in sentry-raven-3.0.1

@@ -1,38 +1,30 @@
 source "https://rubygems.org/"
 
 gemspec
 
-if ENV["RAILS_VERSION"] && (ENV["RAILS_VERSION"].to_i == 4)
-  gem "rails", "< 5"
-  gem "rspec-rails", "> 3"
-elsif ENV["RAILS_VERSION"] && (ENV["RAILS_VERSION"].to_i == 0)
-  # no-op. No Rails.
-else
-  gem "rails", "< 6"
-  gem "rspec-rails", "> 3"
-end
+rails_version = ENV["RAILS_VERSION"].to_f
 
-if RUBY_VERSION < '2.0'
-  gem "mime-types", "< 3.0.0"
-  gem "nokogiri", "~> 1.6.8"
-  gem "rack", "~> 1.6.8"
-  gem "sidekiq", "< 3.2"
-  gem "rack-timeout", "0.3.0"
-else
-  gem "rack"
-  gem "sidekiq"
-  gem "rack-timeout"
+if rails_version != 0
+  gem "rails", "~> #{rails_version}"
+  gem "rspec-rails", "~> 4.0"
 end
+
+gem "sidekiq"
+
+gem "rack"
+gem "rack-timeout"
+
 gem "pry"
-gem "pry-coolline"
 gem "benchmark-ips"
-gem "benchmark-ipsa" if RUBY_VERSION > '2.0'
+gem "benchmark-ipsa"
 gem "ruby-prof", platform: :mri
 gem "rake", "> 12"
-gem "rubocop", "~> 0.41.1" # Last version that supported 1.9, upgrade to 0.50 after we drop 1.9
-gem "rspec", "> 3"
-gem "capybara" # rspec system tests
+gem "rubocop", "~> 0.81.0"
+gem "rspec", "~> 3.9.0"
+gem "capybara", "~> 3.15.0" # rspec system tests
 gem "puma" # rspec system tests
 
 gem "timecop"
-gem "test-unit", platform: :mri if RUBY_VERSION > '2.2'
+gem "test-unit"
+gem "simplecov"
+gem "codecov"