diff --git a/Gemfile b/Gemfile
index f5094d7..9f71d29 100644
--- a/Gemfile
+++ b/Gemfile
@@ -1,4 +1,4 @@
 source 'https://rubygems.org'
 gem 'github_api'
 gem 'httparty'
-gem 'colorize'
+gem 'colorize'
\ No newline at end of file
diff --git a/github_changelog_generator.gemspec b/github_changelog_generator.gemspec
index a360b1a..0020823 100644
--- a/github_changelog_generator.gemspec
+++ b/github_changelog_generator.gemspec
@@ -2,7 +2,6 @@
 
 lib = File.expand_path('../lib', __FILE__)
 $LOAD_PATH.unshift(lib) unless $LOAD_PATH.include?(lib)
-
 require 'github_changelog_generator/version'
 
 Gem::Specification.new do |spec|
@@ -20,12 +19,15 @@ Gem::Specification.new do |spec|
   spec.license       = "MIT"
 
   spec.files = `git ls-files -z`.split("\x0")
-  spec.rubygems_version = %q{1.6.2}
+  spec.executables   = spec.files.grep(%r{^bin/}) { |f| File.basename(f) }
+  spec.test_files    = spec.files.grep(%r{^(test|spec|features)/})
   spec.require_paths = ["lib"]
 
+  spec.add_development_dependency "bundler", "~> 1.7"
+  spec.add_development_dependency "rake", "~> 10.0"
+
   spec.add_runtime_dependency(%q<httparty>, ["~> 0.13"])
   spec.add_runtime_dependency(%q<github_api>, ["~> 0.12"])
   spec.add_runtime_dependency(%q<colorize>, ["~> 0.7"])
 
-  spec.executables   = %w(github_changelog_generator)
 end