diff --git a/spec/integration/mutant/rspec_spec.rb b/spec/integration/mutant/rspec_spec.rb
index 156b5691..c1eee04f 100644
--- a/spec/integration/mutant/rspec_spec.rb
+++ b/spec/integration/mutant/rspec_spec.rb
@@ -4,7 +4,7 @@ RSpec.describe 'rspec integration', mutant: false do
 
   let(:base_cmd) { 'bundle exec mutant -I lib --require test_app --use rspec' }
 
-  %w[3.7].each do |version|
+  %w[3.7 3.8].each do |version|
     context "RSpec #{version}" do
       let(:gemfile) { "Gemfile.rspec#{version}" }
 
diff --git a/test_app/Gemfile.rspec3.8 b/test_app/Gemfile.rspec3.8
new file mode 100644
index 00000000..85bee624
--- /dev/null
+++ b/test_app/Gemfile.rspec3.8
@@ -0,0 +1,7 @@
+source 'https://rubygems.org'
+gem 'rspec',      '~> 3.8.0'
+gem 'rspec-core', '~> 3.8.0'
+gem 'mutant',       path: '../'
+gem 'mutant-rspec', path: '../'
+gem 'adamantium'
+eval_gemfile File.expand_path('../../Gemfile.shared', __FILE__)