diff --git a/rspec-nc.gemspec b/rspec-nc.gemspec
index 3bf2036..66b05e2 100644
--- a/rspec-nc.gemspec
+++ b/rspec-nc.gemspec
@@ -9,6 +9,7 @@ Gem::Specification.new do |gem|
   gem.homepage      = 'https://github.com/twe4ked/rspec-nc'
 
   gem.add_dependency 'terminal-notifier', '~> 1.4.2'
+  gem.add_dependency 'rspec', '~> 2.9.0'
 
   gem.files         = `git ls-files`.split($\)
   gem.executables   = gem.files.grep(%r{^bin/}).map{ |f| File.basename(f) }