diff --git a/aasm.gemspec b/aasm.gemspec
index b29fa72..4aa0745 100644
--- a/aasm.gemspec
+++ b/aasm.gemspec
@@ -23,6 +23,8 @@ Gem::Specification.new do |s|
   s.add_development_dependency 'rspec', ">= 3"
   s.add_development_dependency 'generator_spec'
   s.add_development_dependency 'appraisal'
+  s.add_development_dependency "simplecov"
+  s.add_development_dependency "codecov", ">= 0.1.10"
 
   # debugging
   # s.add_development_dependency 'debugger'
diff --git a/spec/spec_helper.rb b/spec/spec_helper.rb
index a9aadf7..ed2e164 100644
--- a/spec/spec_helper.rb
+++ b/spec/spec_helper.rb
@@ -1,3 +1,13 @@
+require 'simplecov'
+SimpleCov.start do
+  add_filter '/spec/'
+end
+
+if ENV['CI'] == 'true'
+  require 'codecov'
+  SimpleCov.formatter = SimpleCov::Formatter::Codecov
+end
+
 $LOAD_PATH.unshift(File.expand_path(File.dirname(__FILE__)))
 $LOAD_PATH.unshift(File.expand_path(File.join(File.dirname(__FILE__), '..', 'lib')))
 require 'aasm'