middleman-pagegroups.gemspec in middleman-pagegroups-1.0.2 vs middleman-pagegroups.gemspec in middleman-pagegroups-1.0.3

@@ -1,9 +1,11 @@
 # -*- encoding: utf-8 -*-
 $:.push File.expand_path('../lib', __FILE__)
 require 'middleman-pagegroups/version'
 
+mm_needed = ['~> 4.1', '>= 4.1.7']
+
 Gem::Specification.new do |s|
   s.name        = 'middleman-pagegroups'
   s.version     = Middleman::MiddlemanPageGroups::VERSION
   s.platform    = Gem::Platform::RUBY
   s.authors     = ['Jim Derry']
@@ -17,10 +19,16 @@
   s.test_files    = `git ls-files -- {test,spec,features}/*`.split("\n")
   s.executables   = `git ls-files -- bin/*`.split("\n").map{ |f| File.basename(f) }
   s.require_paths = ['lib']
   
   # The version of middleman-core your extension depends on
-  s.add_runtime_dependency('middleman-core', ['~> 4.1', '>= 4.1.6'])
+  s.add_runtime_dependency('middleman-core', mm_needed)
 
   # Additional dependencies
-  s.add_runtime_dependency('middleman-cli', ['~> 4.1', '>= 4.1.6'])
+  s.add_runtime_dependency('middleman-cli', mm_needed)
+
+  # Development dependencies
+  s.add_development_dependency 'middleman', mm_needed
+  s.add_development_dependency 'bundler',   '>= 1.6'
+  s.add_development_dependency 'rake',      '>= 10.3'
+  s.add_development_dependency 'git'
 end