Require Ruby 2.1.9 or higher

.rubocop.yml

@@ -1,4 +1,5 @@
 AllCops:
+  TargetRubyVersion: 2.1
   Include:
     - 'Gemfile'
     - 'Rakefile'

.travis.yml

@@ -1,20 +1,18 @@
 bundler_args: --without development
+cache: bundler
 env:
   global:
     - JRUBY_OPTS="$JRUBY_OPTS --debug"
 language: ruby
 rvm:
-  - 1.9.3
-  - 2.0.0
-  - 2.1
-  - 2.2
-  - jruby-19mode
-  - jruby-head
-  - rbx-2
+  - 2.1.9
+  - 2.2.6
+  - 2.3.3
+  - 2.4.0
+  - jruby-9.1.6.0
   - ruby-head
 matrix:
   allow_failures:
-    - rvm: jruby-head
     - rvm: ruby-head
   fast_finish: true
 sudo: false

README.md

@@ -119,15 +119,13 @@ Ruby wrapper for the RubyGems.org API.
 This library aims to support and is [tested against][travis] the following Ruby
 implementations:
 
-* Ruby 1.9.3
-* Ruby 2.0.0
-* Ruby 2.1.0
-* Ruby 2.2.0
+* Ruby 2.1
+* Ruby 2.2
+* Ruby 2.3
+* Ruby 2.4
 * [JRuby][]
-* [Rubinius][]
 
 [jruby]: http://www.jruby.org/
-[rubinius]: http://rubini.us/
 
 If something doesn't work on one of these interpreters, it's a bug.
 

gems.gemspec

@@ -4,7 +4,7 @@ $LOAD_PATH.unshift(lib) unless $LOAD_PATH.include?(lib)
 require 'gems/version'
 
 Gem::Specification.new do |spec|
-  spec.add_dependency 'json', '~> 1.8'
+  spec.add_dependency 'json'
   spec.add_development_dependency 'bundler', '~> 1.0'
   spec.authors       = ['Erik Michaels-Ober']
   spec.description   = 'Ruby wrapper for the RubyGems.org API'
@@ -14,7 +14,7 @@ Gem::Specification.new do |spec|
   spec.licenses      = %w(MIT)
   spec.name          = 'gems'
   spec.require_paths = %w(lib)
-  spec.required_ruby_version = '>= 1.9.3'
+  spec.required_ruby_version = '>= 2.1.9'
   spec.summary       = spec.description
   spec.version       = Gems::VERSION
 end