diff --git a/.travis.yml b/.travis.yml
new file mode 100644
index 0000000..1546723
--- /dev/null
+++ b/.travis.yml
@@ -0,0 +1,5 @@
+language: ruby
+rvm:
+  - 2.2.7
+  - 2.3.4
+  - 2.4.1
diff --git a/spec/spec_helper.rb b/spec/spec_helper.rb
index 547261c..41e3686 100644
--- a/spec/spec_helper.rb
+++ b/spec/spec_helper.rb
@@ -6,7 +6,7 @@
 
 def mock_model(name, attributes)
   attributes[:attributes] = attributes.clone
-  mock(name, attributes)
+  double(name, attributes)
 end
 
 def mock_company(name, address)
@@ -15,7 +15,7 @@ def mock_company(name, address)
 
 def mock_user(name, age, email, company)
   user = mock_model(name, :name => name, :age => age, :email => email)
-  user.stub!(:company).and_return(company)
+  user.stub(:company).and_return(company)
   user
 end
 
diff --git a/to_xls.gemspec b/to_xls.gemspec
index a880214..0641c4b 100644
--- a/to_xls.gemspec
+++ b/to_xls.gemspec
@@ -20,7 +20,7 @@ Gem::Specification.new do |s|
   s.require_paths = ["lib"]
 
   s.add_runtime_dependency "spreadsheet"
-  s.add_development_dependency "rspec", "~> 2.11.0"
+  s.add_development_dependency "rspec", "~> 3.6.0"
   s.add_development_dependency "bundler"
   s.add_development_dependency "rake"
 end