Gemfile in polyamorous-1.1.0 vs Gemfile in polyamorous-1.2.0

@@ -2,30 +2,32 @@
 gemspec
 
 gem 'rake'
 
 rails = ENV['RAILS'] || 'master'
-arel = ENV['AREL'] || 'master'
 
-arel_opts = case arel
-when /\// # A path
-  {:path => arel}
-when /^v/ # A tagged version
-  {:git => 'git://github.com/rails/arel.git', :tag => arel}
-else
-  {:git => 'git://github.com/rails/arel.git', :branch => arel}
+if rails == 'master'
+  arel = ENV['AREL'] || 'master'
+  arel_opts =
+    case arel
+    when /\// # A path
+      { path: arel }
+    when /^v/ # A tagged version
+      { git: 'git://github.com/rails/arel.git', tag: arel }
+    else
+      { git: 'git://github.com/rails/arel.git', branch: arel }
+    end
+  gem 'arel', arel_opts
 end
 
-gem 'arel', arel_opts
-
 case rails
 when /\// # A path
-  gem 'activerecord', :path => "#{rails}/activerecord"
+  gem 'activerecord', path: "#{rails}/activerecord"
 when /^v/ # A tagged version
-  git 'git://github.com/rails/rails.git', :tag => rails do
+  git 'git://github.com/rails/rails.git', tag: rails do
     gem 'activerecord'
   end
 else
-  git 'git://github.com/rails/rails.git', :branch => rails do
+  git 'git://github.com/rails/rails.git', branch: rails do
     gem 'activerecord'
   end
 end