diff --git a/Gemfile b/Gemfile
index 88ac411..7371c24 100644
--- a/Gemfile
+++ b/Gemfile
@@ -11,6 +11,6 @@ gem "rack-test", "~> 2.1"
 
 gem "rake", "~> 13.0"
 
-gem "simplecov", "~> 0.22"
+gem "simplecov", "~> 0.22", require: false
 
 gem "standard", "~> 1.3"
diff --git a/test/test_helper.rb b/test/test_helper.rb
index ac7eba9..a69caed 100644
--- a/test/test_helper.rb
+++ b/test/test_helper.rb
@@ -2,6 +2,7 @@
 
 # Start SimpleCov
 require "simplecov"
+SimpleCov.external_at_exit = true
 SimpleCov.start do
   add_filter "/test"
 end